How I can vectorize the next code?
信息
此问题已关闭。 请重新打开它进行编辑或回答。
显示 更早的评论
Hello. M is a matrix and v and w are vectors of the same length containing some indices of M. I want to vectorize the following code (without using loops)
for i=1:length(v);
M(v(i),w(i)) = 1;
end
0 个评论
回答（3 个）
Azzi Abdelmalek
2012-10-1
编辑：Azzi Abdelmalek
2012-10-1
M=magic(5); % example
v=1:2;
w=3:4
idx=sub2ind(size(M),v,w)
M(idx)=1
0 个评论
Image Analyst
2012-10-1
You simply do
M(v, w) = 1;
Here's proof:
M = magic(10)
v = randi(10, 5,1)
w = randi(10, 5,1)
M(v,w) = 1
2 个评论
Alfredo Rojas
2012-10-1
Image Analyst
2012-10-1
编辑：Image Analyst
2012-10-1
Ah, you're right, that won't work (though it seems like it would). Use Azzi's code then.
Andrei Bobrov
2012-10-1
编辑：Andrei Bobrov
2012-10-1
M = randi([100,300],10);
v = randi(10,7,1);
w = randi(10,7,1);
M(v + size(M,1)*(w-1)) = 1
0 个评论
此问题已关闭。
2012-10-1
关闭：
2021-8-20
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
