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Ignore NaN

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Ignore NaN

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01 Aug 2007 (Updated )

returns the result of the function of an array ignoring NaN elements

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Description

Occasionally I record missing data, invalid data or erroneous data as NaN. But if I have a array of data where the columns are different measurements and the rows are different measurement times the NaNs make it difficult to perform statistical operations on.

This Function will perform a function on the data (assuming the function is designed to operate on an array) but it will ignore any NaNs.

For example
X=[ 1 2 4;
1 5 NaN;
NaN 3 1]

std(X)

ans =

       NaN 1.5275 NaN

>> ignoreNaN(X,@std)

ans =

         0 1.5275 2.1213

This function is designed to work on any size array.

MATLAB release MATLAB 7.3 (R2006b)
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Comments and Ratings (6)
21 May 2014 Nolan C

Is there a way to use this for functions that take two arguments? (i.e., dotprod (x,y))?

27 Jun 2012 Andrey

Excellent!!! Works like charm.

21 Oct 2011 Kathryn McCormick  
23 Mar 2011 Naresh Pai  
01 Dec 2010 Matt G

There is an example in the description above. You may also want to review function handles

31 Aug 2010 Rehana

Plz tell me how to use this file in my code so that I can use "ignoreNaN" in my code?

Updates
15 Aug 2007

This correction will return NaN if all element operated on are NaNs.

Also with the previous version if a vector of NaNs was on the outside dimension the correct result was not returned.

See Screenshot

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