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Is there a way to convert function handles to nan equivalent function handles?

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Udit Gupta
Udit Gupta on 2 Sep 2015
Commented: Udit Gupta on 2 Sep 2015
I am passing a cell array of function handles to my function. Typically a user might pass something like-
{@sum,@median,@mean}
Now depending upon whether or not the inputs to these functions has any NaN values I want to programmatically change it to -
{@nansum,@nanmedian,@nanmean}
Is there a way to do so?

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Accepted Answer

Steven Lord
Steven Lord on 2 Sep 2015
Yes, but it would be fragile. Would you want to detect all of these are being equivalent to plain old @sum?
@sum
@(x) sum(x)
@(x) sum(x, 1) % where x is guaranteed to be a 2-D array with nonsingleton first dimension
@(x) sum(x, 'default')
Instead, for this particular scenario I'd like to suggest a different approach. If you're using release R2015a or later, and you know that your cell array contains only some subset of the eight functions listed in the "Descriptive Statistics: Omit NaN values in basic statistical calculations" item in the Mathematics section of the release R2015a Release Notes for MATLAB, pass the 'omitnan' flag into those functions when you call them via the function handle.

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Udit Gupta
Udit Gupta on 2 Sep 2015
Looks like a good solution. I did not realize there was an option to do this. Thanks!

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