Ignore NaN

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

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)

[Rehana]

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

[Matt G]

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

[Naresh Pai]

 

[Kathryn McCormick]