Conditional entry-wise matrix operation
2 views (last 30 days)
Show older comments
Deepayan Bhadra
on 20 Feb 2018
Commented: Deepayan Bhadra
on 21 Feb 2018
Hi, I am trying to compute the matrix 'Y' as follows with matrix 'X' as an input.
If X_ij > 0
then Y_ij = X_ij + log(exp(-X_ij)+1)
else Y_ij = log(1+exp(X_ij))
How do I implement this without any loops? Thanks.
0 Comments
Accepted Answer
James Tursa
on 21 Feb 2018
Edited: James Tursa
on 21 Feb 2018
Hints:
What does the expression -abs(X) do in relation to your condition of X_ij > 0? Could you use this in your formula for the calculation of Y?
Or, what if you created a logical indexing variable for your condition, such as g = X > 0. Can you think of how to use g as an index to calculating the appropriate elements of Y?
More Answers (0)
See Also
Categories
Find more on Loops and Conditional Statements in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!