ttest Matlab R2016b does not work properly

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Here the code given by mathworks help for the ttest function in R2016b https://www.mathworks.com/help/releases/R2016b/stats/ttest.html?searchHighlight=ttest&s_tid=doc_srchtitle#btrj1_f-1

load examgrade
x = grades(:,1);
y = grades(:,2);
[h,p] = ttest(x,y)

the error I got :

Error using size
Dimension argument must be a positive integer scalar within indexing range.
Error in nanstd (line 59)
tile(dim) = size(x,dim);
Error in ttest (line 132)
sdpop = nanstd(x,[],dim);

The problem is probably at the call of nanstd which the dim=0.

The ttest function is read only from the statistics toolbox.

How to solve this problem?

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Wouter Maes 2017-10-11

编辑：Walter Roberson 2017-10-11

在 MATLAB Online 中打开

I have the exact same problem occurring. I tested several datasets, and ttest always gave this error.

(For instance, I did

Dist=makedist('Normal'); B1=random(Dist,1000,1); [h, p] = ttest(B1);

I always get the error:

Error using size
Dimension argument must be a positive integer scalar within indexing range.
Error in nanmean
Error in nanstd
Error in ttest (line 132)
sdpop = nanstd(x,[],dim);