Need help on creating loop

Please I need assistance on this code, I am trying to matching two data. The first one is the training set, while the second one is the test set. They both contain 1 x 20 row vector each. Each cell in the vector is the value of an object length. Now I want to match the two data, such that the result is 19 x 20, instead of 20 x 20. Because test data number 1 should be match against all but itself and the same thing for the rest of the data. The computation is just the normal cumulative distribution function with mean 0 and standard deviation 1.

 numtrainW = length(Wtrain);
 numtestW  = length(Wtest);
 wscore = [];
 for  b=1:numtestW;
 for  d=1:numtrainW;
     c_w = var(Wtrain);
     Zw = abs(Wtrain(d)-Wtest(b,:))/c_w;
     p_w = cdf('Normal',Zw,0,1);
     Sw = 2*(1-p_w);
     wscore = [wscore; Sw];
 end
 end

Thank you.