How to debugg below error, Below we have attached file.

Error using crossval>evalFun (line 480) The function '@(xtr,ytr,xte,yte)confusionmat(yte,classify(xte,xtr,ytr),'order',order)' generated the following error: The pooled covariance matrix of TRAINING must be positive definite.

Error in crossval>getFuncVal (line 497) funResult = evalFun(funorStr,arg(:));

Error in crossval (line 343) funResult = getFuncVal(1, nData, cvp, data, funorStr, []);

Error in group_Partition (line 16) cfMat = crossval(f,X,y,'partition',cp);

[Jan]

The error message is:

 The pooled covariance matrix of TRAINING must be positive definite.

The posted code does not allow to check, why your data does not have such properties.