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

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Udit Gupta 2015-9-2

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https://ww2.mathworks.cn/matlabcentral/answers/239157-is-there-a-way-to-convert-function-handles-to-nan-equivalent-function-handles

评论： Udit Gupta 2015-9-2

采纳的回答： Steven Lord

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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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Answer 1

Steven Lord 2015-9-2

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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.