Standard deviation of multiple cell arrays

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

Answer 1

[Star Strider]

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

Supply an empty array [] for the weight argument and it should work.

.

[Christoph Thorwartl]

Thanks for the quick response. It works perfectly!

[Star Strider]

As always, my pleasure!