change even column values only

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PK
PK 2016-9-29
评论： Thorsten 2016-9-29
I create 20*20 2D array of all ones. And then I want to change even columns to minus one. How can I change with builtin function?

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Thorsten
Thorsten 2016-9-29
A = ones(20);
A(:,mod(1:20, 2) == 0) = -1;
  2 个评论
PK
PK 2016-9-29
good answer! I got the following method.... A = ones(20) A(:,2:2:end) = -1
Thorsten
Thorsten 2016-9-29
You method is even better!

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更多回答（1 个）

PK
PK 2016-9-29
good answer! I got the following method.... A = ones(20) A(:,2:2:end) = -1

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