Using isinf and isnan in the same command line?

Greetings all,

Trying to compute some statistics for a particular data array that has Nan and Inf values scattered throughout.

Right now as an example, for one of the arrays, I have the following line: std_sigma1outs=cellfun(@(a)std(a(~isinf(a))),sigma1outs);

So, two questions. 1.) Can I use isinf and isnan on the same array in the same line? 2.) Reading the help files, I see that I can exclude NaNs in std (omitNaN flag). What about excluding Inf's simultaneously? Can someone give me example with my command line I provided to see how that combination would be coded?

Thanks! -J

Answer 1

[Brendan Hamm]

f = @(a) std(a(~isinf(a) & ~isnan(a)));
% f = @(x) std(a(~isinf(a)),'omitnan');  
std_sigma1outs=cellfun(f,sigma1outs);

Either way will work fine, but omitnan is a more recent addition to the statistical functions in base MATLAB, so I provide both. The first version utilizes the 'and' operator:

>> true & true
ans =
     1
>> false & false
ans =
     0
>> true & false
ans =
     0
>> false & true
ans =
     0

[Jesse]

Great thanks Brendan!

-Jesse

Answer 2

[Jan]

~isnan(X) & ~isinf(X) is the same as isfinite(X).

[Jesse]

Oh! I didn't know that but thanks for the feedback Jan.