MATLAB: Can we sum a series of values,even some of them are “NaN”?If i want to do it,how can i do

MATLABnansum

I get a series answer of optimal problem in several times,and i want to sum of them and average them,however, some of them are "NaN",can i or how to write a code to ignore those "NaN" and sum the others which is not "NaN" ?

The version of matlab is 2015a

Best Answer

You did not indicate your MATLAB version.

For a couple of years now, you have been able to write sum(TheArray, 'omitnan') .

Before that, the easiest approach was to use the Statistics toolbox nansum()

mean() these days also has 'omitnan' flag, and in older versions the Stats tool was nanmean()

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MATLAB: Correlation between two row matrices

Like that, each value of "a" is correlated to each value of "b", but applying the formula of the correlation, the correlation of two single numbers is NaN. To compute the correlation correctly, traspose the input vectors

result  = corr(a', b');

MATLAB: How to force nansum(NaN+ NaN) = NaN, not 0

Just keep track of where all elements are NaN, and replace their sum with NaN after using nansum. You should be able to adapt this example to help you, it sums along each column:

>> A = [1,2,NaN,NaN;3,NaN,4,NaN]
A =
     1     2   NaN   NaN
     3   NaN     4   NaN
>> B = [6,7,8,NaN;9,NaN,NaN,NaN]
B =
     6     7     8   NaN
     9   NaN   NaN   NaN
>> C = nansum(A+B,1)
C =
    19     9     0     0
>> C(all(isnan(A)&isnan(B),1)) = NaN
C =
    19     9     0   NaN

Best Answer

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