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R tutorial - Matrix Arithmetic in R
 
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Do matrix arithmetic in R. Join DataCamp today, and start our interactive intro to R programming tutorial for free: https://www.datacamp.com/courses/free-introduction-to-r Throughout the exercises on matrices, you have already bumped into the `colSums()` and `rowSums()` functions. The `colSums()` function, for example, took the sum of each column, and stored the result in a vector. Apart from these matrix-specifc math functions, you can also do standard arithmetic with functions. Remember how you could do all the typical arithmetic operations on vectors? Again, it's exactly the same thing for matrices: all computations are done element-wise. Ever heard about that other classic trilogy, the Lord of the Rings? As for Star Wars, you can build a matrix of box office revenue for both US and non-US regions. The information is saved in the the matrix, lotr_matrix, which has been constructed as follows: These are astronomical numbers, we're talking about millions of US dollars here. What if you wanted to convert this to Euros? At the time of writing, 1 euro converts to 1 point 12 US dollars, so to convert the figures to euros, we'll have to divide the figures by 1.12. We can simply use the division operator as if we were performing the division on a single number: R performs the operation element-wise: each element is divided by 1.12. This works just the same for multiplication, summation and subtraction. Say, for example, that the theaters world-wide claim 50 million dollars on the box office revenue. How much is left for the Lord of the rings concern itself then? We simply subtract 50 from LOTR matrix: Operating on matrices with single numbers looks pretty straightforward, and this actually also holds when you're performing calculations with two matrices. Suppose that instead of demanding the same sum of money for every release, theaters worldwide ask for 50 million for the first release, 80 for the second and 100 for the third. We could build a matrix, say, `theater_cut`, with the same dimensions as LOTR matrix, that looks as follows If we now subtract theater_cut from LOTR matrix: This time, the substraction was also performed element wise: the figures for the Two towers lowered by 80, while the figures for the return of the king were lowered by 100. Makes perfect sense right? Now, what would happen if we use a vector, containing 50, 80 and 100 to subtract from the lord of the rings matrix? Let's try it out. The result is exactly the same! That's because once again, R performed recycling. R realizes that the dimensions of the matrix and the vector don't match. Therefore, the vector is extended to a matrix of the same size, and is filled up with the vector elements column by column. The matrix that is thus actually subtracted from the lotr matrix is the following: This matrix is the exact same one as we built manually before, so the result is the same. Again, blindly trusting R that it performs recycling just the way you want it can be quite a dangerous practice. You should be fully aware of how this recycling is actually happening. If you are familiar with linear algebra, you might wonder how matrix multiplication would work. Well, in R, multiplication is simply performed element wise. Suppose you want to convert the US dollar figures to euros with the exchange rate at the time of the release, you can again create a new matrix, this time with the amount of euros you should pay for 1 dollar. Now, we can simply multiply the lord of the rings matrix with the rates matrix: Again, every calculation is done element-by-element. The top left figure has been multiplied by one point 11, while the bottom right figure was multiplied by point 82. To end this last video on matrices, I want to stress once more that matrices and vectors are very similar: they simply are data structures that can store elements of the same type. The vector does this in a one-dimensional sequence, while the matrix uses a two-dimensional grid structure. Both of them perform coercion when you want to store elements of different types and both of them perform recycling when necessary. Similarly, vector and matrix arithmetic are straightforward: all calculations are performed element-wise. That's all folks. Time to wrap up on matrices in the following exercises and I'll be awaiting you to explain all about factors!
Views: 26388 DataCamp
If s is the sum, P he product and R the sum of reciprocals of n terms in G. P prove that `P^2.R...
 
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To ask Unlimited Maths doubts download Doubtnut from - https://goo.gl/9WZjCW If s is the sum, P he product and R the sum of reciprocals of n terms in G. P prove that `P^2.R^n=S^n`
Views: 154 Doubtnut
Vectors in R || Tutorial - 7: Sum and Product of vector elements
 
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This R tutorial is about finding the sum and product of the elements (or, components) of a vector in R.
R PROGRAMMING - SUM INTEGERS
 
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USE R TO SUM INTEGERS
Views: 1031 Henrik Rosqvist
R squared part 1
 
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This video introduces the concept of R squared in econometrics, in terms of the explained sum of variance and the total sum of squares. Check out https://ben-lambert.com/econometrics-course-problem-sets-and-data/ for course materials, and information regarding updates on each of the courses. Quite excitingly (for me at least), I am about to publish a whole series of new videos on Bayesian statistics on youtube. See here for information: https://ben-lambert.com/bayesian/ Accompanying this series, there will be a book: https://www.amazon.co.uk/gp/product/1473916364/ref=pe_3140701_247401851_em_1p_0_ti
Views: 29312 Ben Lambert
Sum-Product Networks: Powerful Models with Tractable Inference
 
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Big data makes it possible in principle to learn very rich probabilistic models, but inference in them is prohibitively expensive. Since inference is typically a subroutine of learning, in practice learning such models is very hard. Sum-product networks (SPNs) are a new model class that squares this circle by providing maximum flexibility while guaranteeing tractability. In contrast to Bayesian networks and Markov random fields, SPNs can remain tractable even in the absence of conditional independence. SPNs are defined recursively: an SPN is either a univariate distribution, a product of SPNs over disjoint variables, or a weighted sum of SPNs over the same variables. It's easy to show that the partition function, all marginals and all conditional MAP states of an SPN can be computed in time linear in its size. SPNs have most tractable distributions as special cases, including hierarchical mixture models, thin junction trees, and nonrecursive probabilistic context-free grammars. I will present generative and discriminative algorithms for learning SPN weights, and an algorithm for learning SPN structure. SPNs have achieved impressive results in a wide variety of domains, including object recognition, image completion, collaborative filtering, and click prediction. Our algorithms can easily learn SPNs with many layers of latent variables, making them arguably the most powerful type of deep learning to date. (Joint work with Rob Gens and Hoifung Poon.)
Views: 948 Microsoft Research
2.5 Sum Product of Roots (sound).avi
 
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2.5 Sum Product of Roots (sound).avi
Views: 56 Mr R
Elon Lindenstrauss - Sum product phenomenon and random walks III.
 
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Elon Lindenstrauss: Sum product phenomenon and random walks III. Random walk on $\mathbb{R}^d$, independent isometries, spectral gap, Fourier transform.
Views: 32 RenyiTeam
WASPAS ( Weighted Aggregated Sum Product Assessment )
 
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A Multi criteria decision making method which is a unique combination of two well known MCDM methods i.e. weighted sum model and weighted product model.
Views: 436 Manoj Mathew
Excel Test 05 - Summing (SUMIFS and SUMPRODUCT)
 
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This video shows to a solution to the Excel skills test Level 1. The test is available for free download at www.AppliedFPA.com. This is a test for candidates at the Analyst to Manager level, and well qualified candidates should be able to complete the entire test in about 20 minutes. Try it yourself, and see what areas you may need to work on.
Views: 1166 AppliedFPA
How To... Calculate Pearson's Correlation Coefficient (r) by Hand
 
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Step-by-step instructions for calculating the correlation coefficient (r) for sample data, to determine in there is a relationship between two variables.
Views: 404878 Eugene O'Loughlin
Elon Lindenstrauss - Sum product phenomenon and random walks II.
 
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Elon Lindenstrauss: Sum product phenomenon and random walks II. Random walk on $\T^d=(\R/\Z)^d$, uniformity of random walks.
Views: 52 RenyiTeam
Finding Sum and Product of Eigen Values of a 3x3 Matrix
 
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http://www.indiastudychannel.com/r/sujoy70.aspx In this video I'll tell you how to find Sum & Product of Eigen Values of a 3x3 matrix very easily. I've uploaded videos on Statistics,Numerical Methods, Business & Financial Mathematics,Operation Research,Computer Science & Engineering(CSE),Android Application Reviews,India Travel & Tourism,Street Foods,Life Tips and many other topics. And a series of videos showing how to use your scientific calculators Casio fx-991ES & fx-82MS to do maths easily. Click my YouTube channel's link below to watch them. Subscribe to my youtube channel below- YouTube- http://www.youtube.com/sujoyn70 Blog- http://www.sujoyn70.blogspot.com
Views: 9157 Sujoy Krishna Das
Let `S` be the sum, `P` be the product and `R` be the sum of the reciprocals of 3 terms of a G....
 
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This is the Solution of Question From RD SHARMA book of CLASS 11 CHAPTER SEQUENCES AND SERIES This Question is also available in R S AGGARWAL book of CLASS 11 You can Find Solution of All Question From RD SHARMA and R S AGGARWAL book from class 6-12 on our app DOUBTNUT for Free #rdsharmasolution #SEQUENCESANDSERIES #rdsharmaclass11 #class11 #cbse #rdsharma #doubtnut ==== QUESTION TEXT ==== Let `S` be the sum, `P` be the product and `R` be the sum of the reciprocals of 3 terms of a G.P. then `P^2R^3: S^3` is equal to (a)`1:1` (b) `(common ratio)^n :1` (c)`(First term)^2(common ratio)^2` (d) None of these === DOWNLOAD DOUBTNUT TO ASK ANY MATH QUESTION === https://doubtnut.app.link/zc7SU9fBlP ==== SCORE 100% WITH DOUBTNUT ==== Doubtnut App has video solutions of ALL the NCERT questions from Class 6 to 12 (including IIT JEE). You can also ask any Math question and get a video solution for FREE from a library of more than 1 Lakh Math Videos ==== FOLLOW US ON FACEBOOK ==== Doubtnut PAGE: https://www.facebook.com/doubtnut DOUBTNUT IIT JEE Group: https://www.facebook.com/groups/251747588948573 ==== WATCH DAILY LIVE CLASSES ON YOUTUBE ==== 5:30 PM - Class 9 6:30 PM - Class 10 7:15 PM - Class 11 8:15 PM - Class 12 9:15 PM - Class 13 (DROPPERS)
Views: 255 Doubtnut
Product To Sum Identities and Sum To Product Formulas - Trigonometry
 
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This trigonometry video tutorial explains how to simplify trigonometric expressions using the product to sum identities and how to find the exact value of trigonometric expressions using the sum to product formulas. New Trigonometry Playlist: https://www.youtube.com/watch?v=oxhXz9_uyiM&index=1&list=PL0o_zxa4K1BVCB8iCVCGOES9pEF6byTMT Access to Premium Videos: https://www.patreon.com/MathScienceTutor https://www.facebook.com/MathScienceTutoring/
HOW TO USE "R" OR "RSTUDIO" TO DO SUMMATION FOR VECTORS
 
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Recorded with http://screencast-o-matic.com
Views: 1930 Mario Michel
How to do Multi Ranking in MS Excel 2013 | Sumproduct formula | Rank If Format
 
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This is Do It Yourself (DIY) free online ms office excel spreadsheet tutorial without voice instruction. Excel Analytics Tutorial : https://www.youtube.com/playlist?list=PLZnHzQfaP-kOY6XVgxq5KX94m9dvCp4I5 Excel Charts for Data Visualization : https://www.youtube.com/playlist?list=PLZnHzQfaP-kOfeUdxNXPmIgAIlvr5qWJu Creative Excel Graphs : https://www.youtube.com/playlist?list=PLZnHzQfaP-kOnddZhSPMWRbhv2pbL0CO2 Fast Track 30 Days Excel Course : https://www.youtube.com/playlist?list=PLZnHzQfaP-kOQCzq7fXw-lNOtmDrlifAZ 450+ Excel Formula Examples : https://www.youtube.com/playlist?list=PLZnHzQfaP-kPCFREvK67qsro3KIwoThVS Difference between Formulas : https://www.youtube.com/playlist?list=PLZnHzQfaP-kPAMQruqKZ0IAUye7lWn90J MIS Report & Dashboard : https://www.youtube.com/playlist?list=PLZnHzQfaP-kOWD8qL60zxfh6ksMpZTg2D Basic Level Excel Interview Test : https://www.youtube.com/playlist?list=PLZnHzQfaP-kP8moHPW31fno6Z1LFMAKNr Intermediate Level Excel Interview Test : https://www.youtube.com/playlist?list=PLZnHzQfaP-kPHlAIsHczOHO-02RoDI5Z9 Advance Level Excel Interview Test : https://www.youtube.com/playlist?list=PLZnHzQfaP-kMA9eKZTzDNjPnHpxkgu7Ag Subscribe & Share this Youtube Channel : https://www.youtube.com/channel/UCr_MTGrHVG78jGSWbGnNIvw Facebook Page : https://www.facebook.com/masterexcelaz Twitter Page : https://twitter.com/masterexcelaz Tumblr Page : https://www.tumblr.com/blog/masterexcelaz Google+ Page : https://plus.google.com/b/103010937837924602754/+ExcelAZvjp Translate Excel videos in your own & known languages : http://www.youtube.com/timedtext_cs_panel?tab=2&c=UCr_MTGrHVG78jGSWbGnNIvw If you need any help about this video, Plz mail to : [email protected] Thank you for watching this video. Please visit again to learn excel anytime. #MSExcel #excel #exceltutorial #MicrosoftExcel #eLearning #learnexcel #Excel2013 #excelfunctions #excelformula
Views: 2438 Excel (A-Z)
Matrices in R || Tutorial - 5: Using apply ( ) function to Matrices
 
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This tutorial provides description on using apply function to matrices in R to compute different things like rows and columns sum, product, mean, sd, cumsum, cumprod etc.
Telescoping Series , Finding the Sum, Example 1
 
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Thanks to all of you who support me on Patreon. You da real mvps! $1 per month helps!! :) https://www.patreon.com/patrickjmt !! Telescoping Series , Finding the Sum, Example 1. Here I find a formula for a series that is telescoping, use partial fractions to decompose the formula, look at partial sums, and take a limit to find the sum.
Views: 360170 patrickJMT
Master Excel's SUMPRODUCT Formula
 
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Quickly learn how Excel's SUMPRODUCT formulas works. Download the workbook: http://www.xelplus.com/excel-sumproduct-formula-easy-explanation/ Get the full course: https://courses.xelplus.com Advanced Excel: Master Excel's SUMPRODUCT Formula This video is part of a series that belongs to my Advanced Training course called "Advanced Excel: Top tips and formulas". The classical use of Excel's SUMPRODUCT function is to do a sum of multiplications. The good thing about SUMPRODUCT is that it can work on arrays of values and it doesn’t have to be entered as an array function so no need to do control + shift + enter (CSE). The great thing about SUMPRODUCT, is that it can help solve many more problems in non-obvious ways. It can act as a conditional SUMIFS function or work as a lookup function as INDEX and MATCH does. It can also act as a COUNTIF function. SUMPRODUCT is also a better SUMIFS, because it can check for OR conditions - which the SUMIFS can't. SUMIFS can only check for AND conditions. In this video you will see different examples of the SUMPRODUCT function and you will learn how it can save you from unnecessary "workarounds" in your Excel files. It will also show you the SUMPRODUCT formula in slow motion. ★ My Online Excel Courses ► https://courses.xelplus.com ✉ Subscribe & get my TOP 10 Excel formulas e-book for free https://www.xelplus.com/free-ebook/ EXCEL RESOURCES I Recommend: https://www.xelplus.com/resources/
Views: 76493 Leila Gharani
Partial Correlation: Part 1 - Calculating "r"
 
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In this video I show you how to calculate the partial correlation between two variables while holding the effect of a third variable constant. You're first task is to calculate the sum of squares for each of the three variables. Afterwards, you must calculate the sum of products for each of the three variables. Then you can calculate the correlation coefficient between each of the bivariate relationships. Finally, use the partial correlation formula to remove the affect of one variable on the relationship between the other two remaining variables. If you have any questions please feel free to post them in the comments section below and I will get back to you as soon as I can. You can also message me on linkedin: https://ca.linkedin.com/in/szymanskijason
Views: 6332 SPSSisFun
3.3.1 Sum And Product Rules: Video
 
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MIT 6.042J Mathematics for Computer Science, Spring 2015 View the complete course: http://ocw.mit.edu/6-042JS15 Instructor: Albert R. Meyer License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
Views: 1634 MIT OpenCourseWare
Trigonometry - Sum-to-product Formulas
 
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An explanation of the sum-to-product formulas. Click here for the formula sheet - http://www.tilper.com/ws/tf.pdf.
Views: 6676 The Infinite Looper
Sum of Products (Part 2) | SOP Form
 
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Digital Electronics: Sum of Product (Part 2) | SOP Form Contribute: http://www.nesoacademy.org/donate Website ► http://www.nesoacademy.org/ Facebook ► https://goo.gl/Nt0PmB Twitter ► https://twitter.com/nesoacademy Pinterest ► http://www.pinterest.com/nesoacademy/
Views: 174898 Neso Academy
Trigonometry - Product-to-sum Formulas - Example 1
 
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An example of using product-to-sum formulas. Click here for the formula sheet - http://www.tilper.com/ws/tf.pdf.
Views: 12638 The Infinite Looper
2.2.1 Congruence mod n: Video
 
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MIT 6.042J Mathematics for Computer Science, Spring 2015 View the complete course: http://ocw.mit.edu/6-042JS15 Instructor: Albert R. Meyer License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
Views: 60055 MIT OpenCourseWare
Sergei Konyagin: On sum sets of sets having small product set
 
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Find this video and other talks given by worldwide mathematicians on CIRM's Audiovisual Mathematics Library: http://library.cirm-math.fr. And discover all its functionalities: - Chapter markers and keywords to watch the parts of your choice in the video - Videos enriched with abstracts, bibliographies, Mathematics Subject Classification - Multi-criteria search by author, title, tags, mathematical area We improve a result of Solymosi on sum-products in ℝ, namely, we prove that max (|A+A|,|AA|≫|A|4/3+c, where c [is greater than] 0 is an absolute constant. New lower bounds for sums of sets with small product set are found. Previous results are improved effectively for sets A⊂ℝ with |AA|≤|A|4/3. Joint work with I. D. Schkredov. Recording during the thematic meeting: «Additive combinatorics in Marseille » the September 10, 2015 at the Centre International de Rencontres Mathématiques (Marseille, France) Filmmaker: Guillaume Hennenfent
Karnaugh Map (K Map) -1| Sum of Product (SOP) -1 (Digital Electronics-13) by SAHAV SINGH YADAV
 
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Sum of Product (SOP), Karnaugh Map (K Map), Maximization of function using K Map, Full Series- Control System- https://www.youtube.com/watch?v=GbDL5VAU8fk&list=PL00WWA9f-4c9yI6Nr6ot8uoOsVnJzdx1R Signals and Systems- https://www.youtube.com/watch?v=W68Q6zRbZ6U&list=PL00WWA9f-4c8Jhs5jc3M0lW-_TF3U4GSQ Network Analysis- https://www.youtube.com/watch?v=GBtu5lizPSY&list=PL00WWA9f-4c_10bMXg_gLkvlWLGrns4FF Digital Electronics- https://www.youtube.com/watch?v=N82C1RXwBIM&list=PL00WWA9f-4c-Xbi57DlbC6GC82pxBkL7_ GATE Preparation Strategy- https://www.youtube.com/watch?v=VKbdBuzmqTE&list=PL00WWA9f-4c9X9-N321nwlRpyiUO-aOEE Test Series- https://www.youtube.com/watch?v=kkPxBcehCZU&list=PL00WWA9f-4c_-_mtRYPNg3gesDysdECrV Project Work- https://www.youtube.com/watch?v=R_o7vdjrG7o&list=PL00WWA9f-4c-ZYE6qzZ24_6gT2WZrzO3f
Views: 3520 GATE CRACKERS
3.7 Operations across rows in R
 
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This video shows how to carry out operations amongst elements of a vector. In particular we see how to calculate the cumulative sum of a vector using the "cumsum" function and the consecutive differences of elements of a vector using the "diff" function. In the video we see how to use these to carry out operations across rows of data frames. Note that the video shows basic R running on Mac OS but the general idea as well as look and feel is similar to R running on other operating systems with different GUIs. This video is part of the resources for the MAT013 course on SAS and R taught at Cardiff University. http://drvinceknight.github.com/MAT013/
Views: 2965 Vincent Knight
R 1.3 - Create and Work With Vectors
 
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Learn how to create a vector in R using the c() function and the colon-notation (e.g. 1:5), find the length of a vector using the length() function, and subset vectors with bracket-notation and the head() and tail() functions.
Views: 60537 Google Developers
Statistics with R: Matrix and vector multiplication part 2 of 2
 
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How to do element-wise (Hadamard product. Schur product) multiplication and conventional matrix multiplication in R
Views: 2220 Phil Chan
Product of two Vector in R
 
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product of two vectors in r dot product of two vectors in r cross product of two vectors in r
Views: 32 Pendu Vlogs
What is the value of sum r^k for k = m to infinity? - Week 2 - Lecture 3 - Sequences and Series
 
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Subscribe at http://www.youtube.com/kisonecat
Views: 5517 Jim Fowler
Öster - LÖst Sum'R
 
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Extract from "WET" available here : http://osterbeatmaker.bandcamp.com/album/wet
Views: 580 Öster Beatmaker
Ch3 -- Expand and Factor with Product Sum pattern
 
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This video lesson demonstrates how to use the product-sum pattern to expand something like (x + r)(x + s) and to factor x^2+bx+c
Views: 253 Carolyn Nickelo
Solution to Algebraic Expression: Products of Sum and Difference by Famoleras, Swanie Joy R.
 
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Solving Problems on some Basic Algebraic Expressions.
Views: 59 Jhoy Ramirez
ARE YOU A MAD LAD? /r/madlads/ #2 [REDDIT REVIEW]
 
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MORE REDDIT: https://www.youtube.com/playlist?list=PLYH8WvNV1YEn6-a2cGz0yoK5Q2TMzwNc- |AD| Shop and save on the HONOR 7X Lucky Bag promo: https://goo.gl/Kdhbwy  Headphones:: http://rzr.to/edgar Chair:: USA & Asia: https://usa.clutchchairz.com/product/pewdiepie-edition-throttle-series/ Europe: https://europe.clutchchairz.com/en/product/throttle-series-pewdiepie-edition/ Canada: https://canada.clutchchairz.com/product/throttle-series-pewdiepie-edition/ ‎
Views: 6657409 PewDiePie
Program to Calculate Sum of Digits of a Given Number in C (HINDI)
 
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Subscribe : http://bit.ly/XvMMy1 Website : http://www.easytuts4you.com FB : https://www.facebook.com/easytuts4youcom
Views: 89005 easytuts4you
Scrape a website using an R and Power BI and create R functions | D#42
 
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Did you know that you can scrape websites using R? In this video I am going to show you not only how you can scrape websites, but also how to create parameters for an R script and how to create a function with R. Here you can download all the pbix files: https://curbal.com/donwload-center SUBSCRIBE to learn more about Power and Excel BI! https://www.youtube.com/channel/UCJ7UhloHSA4wAqPzyi6TOkw?sub_confirmation=1 Our PLAYLISTS: - Join our DAX Fridays! Series: https://goo.gl/FtUWUX - Power BI dashboards for beginners: https://goo.gl/9YzyDP - Power BI Tips & Tricks: https://goo.gl/H6kUbP - Power Bi and Google Analytics: https://goo.gl/ZNsY8l ☼☼☼☼☼☼☼☼☼☼ POWER BI COURSES: Want to learn Power BI? How about you take one of our courses? Here you can find the available courses: https://curbal.com/courses-overview ☼☼☼☼☼☼☼☼☼☼ ABOUT CURBAL: Website: http://www.curbal.com Contact us: http://www.curbal.com/contact ▼▼▼▼▼▼▼▼▼▼ If you feel that any of the videos, downloads, blog posts that I have created have been useful to you and you want to help me keep on going, here you can do a small donation to support my work and keep the channel running: https://curbal.com/product/sponsor-me Many thanks in advance! ▲▲▲▲▲▲▲▲▲▲ QUESTIONS? COMMENTS? SUGGESTIONS? You’ll find me here: Linkedin ► https://goo.gl/3VW6Ky Twitter ► @curbalen, @ruthpozuelo Facebook ► https://goo.gl/bME2sB
Views: 840 Curbal
C++ program to Print the SUM and product of DIGITS of a number
 
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Here is the video to understand the C++ program logic of printing the sum of digits of an integer.The code is compiled and run in Turbo C++ and will work accurately for number up to 4 digits. All programming students can benefit from this tutorial. If you like the video then please subscribe to our channel SK-0-6 and get the benefits of other lectures too! :)
Views: 4751 SK-O-SIX
Create Queries with Calculated Fields and Aggregate Functions
 
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Create a new field in an Access database query that is a formula/calculation based off of an existing field. Use aggregate functions like average and sum to display summary data about query results.
Views: 420988 Ralph Phillips
Subset Sum Problem Dynamic Programming
 
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Given a set of non negative numbers and a total, find if there exists a subset in this set whose sum is same as total. https://github.com/mission-peace/interview/blob/master/src/com/interview/dynamic/SubsetSum.java https://github.com/mission-peace/interview/wiki
if `sum_1^20 r^3 = a ,sum_1^20 r^2 = b` then sum of products of 1,2,3,4,....20 taking two at a ...
 
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To ask Unlimited Maths doubts download Doubtnut from - https://goo.gl/9WZjCW if `sum_1^20 r^3 = a ,sum_1^20 r^2 = b` then sum of products of 1,2,3,4,....20 taking two at a time is :
Views: 0 Doubtnut
Why is pi here?  And why is it squared?  A geometric answer to the Basel problem
 
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A most beautiful proof of the Basel problem, using light. Plushie pi creatures now available: http://3b1b.co/store More problem-driven learning: https://brilliant.org/3b1b Brilliant's principles list that I referenced: https://brilliant.org/principles/ Special thanks to patrons: https://www.patreon.com/3blue1brown http://3b1b.co/basel-thanks The content here was based on a paper by Johan Wästlund http://www.math.chalmers.se/~wastlund/Cosmic.pdf Check out Mathologer's video on the many cousins of the Pythagorean theorem: https://youtu.be/p-0SOWbzUYI On the topic of Mathologer, he also has a nice video about the Basel problem: https://youtu.be/yPl64xi_ZZA A simple Geogebra to play around with the Inverse Pythagorean Theorem argument shown here. https://ggbm.at/yPExUf7b Some of you may be concerned about the final step here where we said the circle approaches a line. What about all the lighthouses on the far end? Well, a more careful calculation will show that the contributions from those lights become more negligible. In fact, the contributions from almost all lights become negligible. For the ambitious among you, see this paper for full details. Music by Vincent Rubinetti: https://vincerubinetti.bandcamp.com/album/the-music-of-3blue1brown ------------------ 3blue1brown is a channel about animating math, in all senses of the word animate. And you know the drill with YouTube, if you want to stay posted on new videos, subscribe, and click the bell to receive notifications (if you're into that). If you are new to this channel and want to see more, a good place to start is this playlist: http://3b1b.co/recommended Various social media stuffs: Website: https://www.3blue1brown.com Twitter: https://twitter.com/3Blue1Brown Patreon: https://patreon.com/3blue1brown Facebook: https://www.facebook.com/3blue1brown Reddit: https://www.reddit.com/r/3Blue1Brown
Views: 1111005 3Blue1Brown
How To calculate Weighted Averages in Excel
 
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In this video I explain how to calculate a weighted average in Excel. The formula is very simple: sumproduct(values_array,weights_array)/Sum(weights_array). Check out my video on how to do the same thing in r, which is much easier: https://www.youtube.com/watch?v=VysdQKixuc4 Let me know if you have any questions, comments or requests. I'll try and upload the example video as soon as i can :)
Views: 192377 SimplyExcel
Product to Sum and Sum to Product Formulas
 
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I derive two of the eight formulas of Product to Sum and Sum to Product and then work through 5 examples at 7:02 10:07 13:00 18:50 and 23:02 http://www.youtube.com/timedtext_video?v=KRYoFdfhNXE Check out http://www.ProfRobBob.com, there you will find my lessons organized by class/subject and then by topics within each class. Find free review test, useful notes and more at http://www.mathplane.com
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