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

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Pierre Lonfat
Pierre Lonfat 2018-2-22
评论： Pierre Lonfat 2018-2-27
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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回答（1 个）

Chandani Madnani
Chandani Madnani 2018-2-26
编辑：Chandani Madnani 2018-2-26
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 ?
  1 个评论
Pierre Lonfat
Pierre Lonfat 2018-2-27
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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