How to make any math operation when there are NaN in data serial?
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Carlos Batista
el 13 de Jul. de 2014
Comentada: Carlos Batista
el 14 de Jul. de 2014
How to make any math operation when there are NaN in data serial?
I'd like to make an test using in my data serial NaN...
For exemplo: I have 2 matrix (a and b) and I'd like of sum them!!!
Ex:
a=[1,2,3,NaN,5]
b=[1,2,3,8,5]
c=(a+b)
How can I to do?
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Respuesta aceptada
Image Analyst
el 13 de Jul. de 2014
Editada: Image Analyst
el 13 de Jul. de 2014
Try these two different approaches:
a=[1,2,3,NaN,5]
b=[1,2,3,8,5]
cWithNans = a + b % c(4) will = nan
nonNanLocations = ~isnan(cWithNans) % Location of indexes that are good.
cwithoutNans = cWithNans(nonNanLocations)
% c(4) is skipped and new c(4) = old c(5)
5 comentarios
Image Analyst
el 13 de Jul. de 2014
isnan() is a function that is the same length as the array that you pass it. It will be true or 1 where there is a nan in the array, and false or 0 where there is a good number. You can pass that in to the array as an index to extract all the elements of the array that are, or are not, nans.
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