Problem using ttest and signrank functions

I'm trying to use the ttest and the signrank functions but they don't work.

When using the ttest function it says:

Undefined function or variable 't'.

Error in nanmean (line 7) N = sum(~isnan(t), dim);

Error in ttest (line 131) xmean = nanmean(x,dim);

and for the signrank it says:

Error using signrank (line 95) SIGNRANK requires vector rather than matrix data.

I have the following toolboxes installed: MATLAB Version 8.2 (R2013b) Signal Processing Toolbox Version 6.20 (R2013b) Statistical Parametric Mapping Version 5236 (SPM8) Statistics Toolbox Version 8.3 (R2013b)

Thank you very much in advance.

[Eric]

Sorry about that. Here is the code for performing the Wilcoxon Signed-Rank Test on EEG data:

pval = 0.05

all = Alphapower;

dataalpha1 = all(1:3,:,:);

dataalpha2 = all(4:6,:,:);

           for channel = 1:19
                pre = dataalpha1(:,1,channel);
                post = dataalpha2(:,2,channel);
                [p, h, stats] = signrank(post, pre, 'alpha', pval);

           end

Answer 1

[José-Luis]

 [p, h, stats] = signrank(squeeze(post), squeeze(pre), 'alpha', pval);

[Eric]

Thank you for the answer. But does this return values from comparisons for each column (like channel 1 pre compared to channel 1 post)?

[José-Luis]

No, your code was not working because dataalpha1 and dataalpha2 were not vectors but matrices of size [: 1 1]. Squeeze() just makes them a vector array, which is what the function is expecting. You could also do:

 [p, h, stats] = signrank(post(:), pre(:), 'alpha', pval);