hi, I have array a = [5 4 0;3 1 0;5 7 0], how can I replace the value in third column (a(:,3)) with the values in column 1 (a(:,1)) when a(:,1) > a(:,2) . I need obtain [5 3,5] in the third column
1 view (last 30 days)
Show older comments
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/157315/image.png)
0 Comments
Accepted Answer
Image Analyst
on 21 Oct 2016
But when col 1 is less than col 2, you're still replacing it. Just look at your third row. Please make your explanation match your example. You just simply replaced column 3 with column 1 regardless of what column 2 is.
Perhaps you mean this:
m = [5,4,0; 3,1,0; 5,7,0]
% Assign column 1 to column 3
% but only when it's greater than column 2
rowsToReplace = m(:, 1) > m(:, 2)
m(rowsToReplace, 3) = m(rowsToReplace, 1)
More Answers (1)
Gareth Lee
on 21 Oct 2016
Edited: Gareth Lee
on 21 Oct 2016
I think the description of your question is not clear, a(:,1)>a(:,2) is a column vector not all true. Is this your judge condition?
if all(a(:,1)>a(:,2))
a(:,3)=a(:,1);
end
Is this that your want ?
3 Comments
Gareth Lee
on 21 Oct 2016
Since my answer is right, please vote it even though you accept another answer.
See Also
Categories
Find more on Characters and Strings in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!