How to replace values with nan when there is a condition?

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Hi. How could I add a condition to the following? I want NaN in accuracyC if its counterpart in RTc is nan but not when the value in accuracyC is 0. accuracyC and RTc are two matrices. I appreciate your help.
accuracyC(isnan(RTc)) = NaN;

Accepted Answer

Jan
Jan on 18 Apr 2018
Edited: Jan on 18 Apr 2018
 I want NaN in accuracyC if:
   its counterpart in RTc is nan
   but not when the value in accuracyC is 0.
index            = isnan(RTc) & ~(accuracyC == 0);
accuracyC(index) = NaN;

It is slightly more efficient to write x~=0 instead of ~(x==0).

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