Ignore NaN
by Matt G
01 Aug 2007
(Updated 30 Aug 2007)
returns the result of the function of an array ignoring NaN elements
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| File Information |
| 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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| 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 |
| 30 Aug 2007 |
correction for case of size(X,2)=1, and nargin==2 |
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