Conditional entry-wise matrix operation

2018 2 20
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更新时间：2018 2 21
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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.

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James Tursa
James Tursa 2018-2-21
编辑：James Tursa 2018-2-21

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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?

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