change even column values only

PK
2016 9 29
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更新时间：2016 9 29
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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

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A = ones(20);
A(:,mod(1:20, 2) == 0) = -1;

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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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PK
PK 2016-9-29

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

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