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std function error "Subscript indices must either be real positive integers or logicals."

Asked by Pierre Lonfat on 22 Feb 2018
Latest activity Commented on by Pierre Lonfat on 27 Feb 2018
Pardon my stupidity but I really dont understand why matlab refuses to compute the standard deviation.
I checked the data: 355 X 1 double (no NaN inside or whatever). I can compute the mean, sum, median, of this exact same data but I receive an error when I want to do the std ...
I tried the following: A=[1 2 3 1 2 3]';
B=std(A) New error: Index exceeds matrix dimensions.
But if I do it on a brand new script, it works !!
Can anyone tell my what the hell is happening there ?
Thank you so much in advance !

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1 Answer

Answer by Chandani Madnani on 26 Feb 2018
Edited by Chandani Madnani on 26 Feb 2018

I tried to reproduce the scenario by executing the below commands:
>> A=[1 2 3 1 2 3]';
>> B=std(A)
But I get a response:
B =
0.8944
Which version of MATLAB are you using and on which platform ? Is A initialized to something else in between the two commands ?

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I actually found the answer and it is really stupid unfortunately. Never name a variable std (which is used to call the function for the standard deviation). Then everything is right again! Thank you for your answer !

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