Getting an unknown error on calculating Standard Deviation.

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Amit Priyankar
Amit Priyankar 2020-6-19
评论： Hassan Eissa 2023-9-8
I was trying to calculation using inbuilt Standard Deviation function but getting an error.
I ran the following code
load myfile.mat
std(v)
Error:
Error using var (line 74)
Invalid data type. First input argument must be single or double.
Error in std (line 59)
y = sqrt(var(varargin{:}));
  1 个评论
Atul Upadhyay
Atul Upadhyay 2020-6-19
I can see that the vector you are using has the int8 datatype in it and it contains values from 0 to 100. So, while calculating standard deviation there are chances of overflow.
Typecast the vector v to ‘double’ to get the desired output.
load myfile.mat;
v=double(v);
sd=std(v);
Refer to the following documentation to know more about datatypes in MATLAB.
https://in.mathworks.com/help/matlab/matlab_prog/integers.html

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采纳的回答

Atul Upadhyay
Atul Upadhyay 2020-6-19
I can see that the vector you are using has the int8 datatype in it and it contains values from 0 to 100. So, while calculating standard deviation there are chances of overflow.
Typecast the vector v to ‘double’ to get the desired output.
load myfile.mat;
v=double(v);
sd=std(v);
Refer to the following documentation to know more about datatypes in MATLAB.
https://in.mathworks.com/help/matlab/matlab_prog/integers.html

更多回答（2 个）

Bjorn Gustavsson
Bjorn Gustavsson 2020-6-19
Your variable v is a uint8. Try:
std(double(v))
HTH
Hassan Eissa
Hassan Eissa 2023-9-8
Compute the maximum value (max), minimum value (min), average value (mean), standard deviation (std) and the variance ( square of the standard deviation) of the variable 'signal
  1 个评论
Hassan Eissa
Hassan Eissa 2023-9-8
[sample, signal]
Step 1 Compute the Statistics
This file contains a variable called signal that has 730 samples. Compute the maximum value (max), minimum value (min), average value (mean), standard deviation (std) and the variance ( square of the standard deviation) of the variable 'signal'.
% Create the variables below that represent the statistics of the variable signal
%
maxSignal =
minSignal =
avgSignal =
stdSignal =
varSignal =

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