Search results “Sum product in r”

Do matrix arithmetic in R.
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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

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

This R tutorial is about finding the sum and product of the elements (or, components) of a vector in R.

Views: 150
R-programming Library

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

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

Elon Lindenstrauss: Sum product phenomenon and random walks III. Random walk on $\mathbb{R}^d$, independent isometries, spectral gap, Fourier transform.

Views: 32
RenyiTeam

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

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

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. Random walk on $\T^d=(\R/\Z)^d$, uniformity of random walks.

Views: 52
RenyiTeam

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.
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Views: 9157
Sujoy Krishna Das

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
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==== 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
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Views: 255
Doubtnut

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:
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Views: 4804
The Organic Chemistry Tutor

Recorded with http://screencast-o-matic.com

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Mario Michel

GeoTrig
Week 30
5-4

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MrBrophyTPAA

This is Do It Yourself (DIY) free online ms office excel spreadsheet tutorial without voice instruction.
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Views: 2438
Excel (A-Z)

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.

Views: 137
R-programming Library

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

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.
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Views: 76493
Leila Gharani

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

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

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

Digital Electronics: Sum of Product (Part 2) | SOP Form
Contribute: http://www.nesoacademy.org/donate
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Views: 174898
Neso Academy

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

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

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
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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

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

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

How to do element-wise (Hadamard product. Schur product) multiplication and conventional matrix multiplication in R

Views: 2220
Phil Chan

product of two vectors in r
dot product of two vectors in r
cross product of two vectors in r

Views: 32
Pendu Vlogs

Subscribe at http://www.youtube.com/kisonecat

Views: 5517
Jim Fowler

Extract from "WET" available here :
http://osterbeatmaker.bandcamp.com/album/wet

Views: 580
Öster Beatmaker

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

Solving Problems on some Basic Algebraic Expressions.

Views: 59
Jhoy Ramirez

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PewDiePie

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easytuts4you

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
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Views: 840
Curbal

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 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

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

Views: 238269
Tushar Roy - Coding Made Simple

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

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:
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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.
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Views: 1111005
3Blue1Brown

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

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

Views: 19607
ProfRobBob

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