Replace a value if a condition is met

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Danny Helwegen
Danny Helwegen 2018-11-25
评论： Akira Agata 2018-11-25
Hi, I got a little problem and I hoped someone can help me out.
When I have a matrix consisting of 3 columns, I want to replace a value in the third column if a row in the first column has a certain value. For example, I have the following matrix:
A =
3 6 9
2 6 8
3 6 8
Lets call the first column x, the second y and the third z. Now what I want is that when x == 3, than z must become 20.
How can I do this?

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Akira Agata
Akira Agata 2018-11-25
Please try the following:
idx = A(:,1) == 3;
A(idx,3) = 20;
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Danny Helwegen
Danny Helwegen 2018-11-25
This works, thank you very much and I will use the tip
Akira Agata
Akira Agata 2018-11-25
> Image Analyst
Thank you for your comment!

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