How to vectorize this loop? Subsequental subtraction of columns within a matrix

2 次查看（过去 30 天）

显示更早的评论

Senaasa 2014-6-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/132167-how-to-vectorize-this-loop-subsequental-subtraction-of-columns-within-a-matrix

评论： Andrei Bobrov 2014-6-3

采纳的回答： the cyclist

在 MATLAB Online 中打开

I'm trying to vectorize the following loop:

a=rand(1000,100);
j=1;
k=2;
tic
for i=1:50;
    b(:,i)=a(:,j)-a(:,k);
    j=j+1;
    k=k+1'
end
toc

Is there any easier way to subsequently subtract an entire column from the previous column within a matrix?

Thanks, Charles

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

the cyclist 2014-6-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/132167-how-to-vectorize-this-loop-subsequental-subtraction-of-columns-within-a-matrix#answer_139235

在 MATLAB Online 中打开

b = a(:,1:end-1) - a(:,2:end);

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Andrei Bobrov 2014-6-3

在 MATLAB Online 中打开

b = -diff(a,1,2);

请先登录，再进行评论。

更多回答（0 个）

请先登录，再回答此问题。

类别

MATLAB Language Fundamentals Loops and Conditional Statements

在 Help Center 和 File Exchange 中查找有关 Loops and Conditional Statements 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Translated by