Standard deviation of multiple cell arrays

Question

Christoph Thorwartl 2021-6-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/864270-standard-deviation-of-multiple-cell-arrays

评论： Star Strider 2021-6-24

采纳的回答： Star Strider

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I've figured out how to get the average of multiple cell arrays. M is a 1x19 cell

MEAN = mean(cat(3,M{:}),3)

This works well. Now I want to apply the same for the standard deviation:

SD= std(cat(3,M{:}),3)

However, the following error occurs:

>> SD= std(cat(3,M{:}),3)
Error using var (line 197)
W must be a vector of nonnegative weights, or a scalar 0 or 1.
Error in std (line 59)
y = sqrt(var(varargin{:}));

Could someone help me how to rewrite the code?

Thanks and best regards,

Christoph

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Answer 1

Star Strider 2021-6-24

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/864270-standard-deviation-of-multiple-cell-arrays#answer_732585

在 MATLAB Online 中打开

I am not certain what ‘M’ actually is.

Try this —

M = {rand(5),rand(5),rand(5)}                           % Create 'M'
M = 1×3 cell array
    {5×5 double}    {5×5 double}    {5×5 double}
SD = std(cat(3,M{:}),[],3)
SD = 5×5
    0.3347    0.2972    0.2701    0.3528    0.1500
    0.3883    0.3171    0.2027    0.1444    0.1855
    0.2140    0.4325    0.2838    0.2795    0.3368
    0.1092    0.2164    0.0409    0.2087    0.3983
    0.1550    0.1595    0.3300    0.0953    0.1421