Two sample t-test not working

Hi guys I have tried to conduct a two sample t test on two matrix x and y where x is a 175x16 matrix and y is 1x16 matrix but the matlab gives me the following error:

h=ttest2 (x,y)
Error using mean
Too many output arguments.

Error in nanmean (line 17)
y = mean(varargin{:},'omitnan');

Error in ttest2 (line 171)
difference = nanmean(x,dim) - nanmean(y,dim);

Does anyone know a soultion for this?

Thanks for the help in advance.

[Jos (10584)]

Did you, somehow, overloaded the function mean? What does

which mean 

returns?

[Abdullah Azzam]

It returns nothing how may I get it back?

[Adam Danz]

Somewhere in your code there is a custom function named "mean" (or it could be a global variable). You have to find where that happens and rename it to something else.

I'd start by searching for

which mean -all

which will likely list several function on your path, many of which will be followed by "Shadowed...". You'll need to look for any custom function in that list.

A temporary solution would be to clear "mean" just prior to calling ttest2() but this doesn't address the root of the problem.

clear('mean')
ttest2(....)

[Abdullah Azzam]

It worked. It happens that I had created a function name mean I just renamed it and restart the program.

Thanks for your help.