matrix

问题 Problem I am learning about HPC and code optimization. I attempt to replicate the results in Goto's seminal matrix multiplication paper (http://www.cs.utexas.edu/users/pingali/CS378/2008sp/papers/gotoPaper.pdf). Despite my best efforts, I cannot get over ~50% maximum theoretical CPU performance. Background See related issues here (Optimized 2x2 matrix multiplication: Slow assembly versus fast SIMD), including info about my hardware What I have attempted This related paper (http://www.cs

问题 Problem I am learning about HPC and code optimization. I attempt to replicate the results in Goto's seminal matrix multiplication paper (http://www.cs.utexas.edu/users/pingali/CS378/2008sp/papers/gotoPaper.pdf). Despite my best efforts, I cannot get over ~50% maximum theoretical CPU performance. Background See related issues here (Optimized 2x2 matrix multiplication: Slow assembly versus fast SIMD), including info about my hardware What I have attempted This related paper (http://www.cs

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . I've been having fun rendering charts and graphs from co-ordinates lately, and I'm fascinated by using matrices to transform co-ordinate spaces. I've been able to successfully scale and invert 2 dimensional co-ordinate spaces, but now my appetite is whetted. :) Where can I go for clear, informative, (free),

问题 I have a matrix lets say: A=[1 2 1; 5 6 7; 7 8 9] and I want to extract its rows in the following format: x_1=[1 2 1] x_2=[5 6 7] x_3=[7 8 9] I want to know how I can write x_1 , x_2 , x_3 . I know how to extract the rows but I don't know how to make my x_1 , x_2 and x_3 . I want this to be automatic , because my real matrix has a very large size and I don't want to make x_1 x_2 .. x_100 by hand. 回答1: You can try the following: m = size(A,1); for i=1:m % set the variable name varName =

问题 I am completely lost as to how I can solve this. I need to create a matrix of radio buttons, column 1 to 3 and rows A to C. A B C 1 (o) (o) (o) 2 (o) (o) (o) 3 (o) (o) (o) <table> <tr> <td>1</td> <td><input type="radio" id="ljudkalla_1" name="ljudkalla_1" value="Radio A" onclick="checkMatrixRow(this)"></td> <td><input type="radio" id="ljudkalla_2" name="ljudkalla_2" value="Radio B" onclick="checkMatrixRow(this)"></td> <td><input type="radio" id="ljudkalla_3" name="ljudkalla_3" value="Ipod A"

问题 I have a problem with my rotation on my 3D object (It's in java but it doesn't really matter) The background: I have a simple 3d model, and you are a first person player on it, you move your mouse up to look up (I.E Rotate by the 3D's x-axis) and move your mouse down to look down (Rotate in opposite direction) But: I also have the left and right arrow keys to turn left/right (Which rotates the 3D's y-axis) Now the problem is, when I have turned, when I rotate by the x-axis it no longer turns

问题 Can anyone tell me how to multiply corresponding elements of two matrices in ojAlgo? Looking for block function for c[i][j] = a[i][j] * b[i][j] 回答1: There are several ways to do that. Here's one alternative: matrixA.operateOnMatching(MULTIPLY, matrixB).supplyTo(matrixC); Where MULTIPLY comes from a static import (org.ojalgo.function.constant.PrimitiveMath). 来源： https://stackoverflow.com/questions/41665158/elementwise-multiplication-two-matrices-or-primitivedensestores-in-ojalgo

问题 I have a set of csv data that is saved in matrix format attached image is an example of the matrix I would like to load the data into R and have it stored as a data frame with x$Year,x$Death,x$ASMR. How would I be able to do that? Thanks! CS 回答1: I think you're just looking for read.csv() and then change the colnames . I am assuming your file is separated by commas. x <- read.csv('matrix.csv', sep=',', header=T) colnames(x) <- c('Year', 'Death', 'ASMR') 来源： https://stackoverflow.com/questions

问题 I have a set of csv data that is saved in matrix format attached image is an example of the matrix I would like to load the data into R and have it stored as a data frame with x$Year,x$Death,x$ASMR. How would I be able to do that? Thanks! CS 回答1: I think you're just looking for read.csv() and then change the colnames . I am assuming your file is separated by commas. x <- read.csv('matrix.csv', sep=',', header=T) colnames(x) <- c('Year', 'Death', 'ASMR') 来源： https://stackoverflow.com/questions

问题 I have a set of csv data that is saved in matrix format attached image is an example of the matrix I would like to load the data into R and have it stored as a data frame with x$Year,x$Death,x$ASMR. How would I be able to do that? Thanks! CS 回答1: I think you're just looking for read.csv() and then change the colnames . I am assuming your file is separated by commas. x <- read.csv('matrix.csv', sep=',', header=T) colnames(x) <- c('Year', 'Death', 'ASMR') 来源： https://stackoverflow.com/questions