NORMPDF returns normal probability density 

 pdf = normpdf(x,m,s);

 Computes the PDF of a the normal distribution 
    with mean m and standard deviation s
    default: m=0; s=1;
 x,m,s must be matrices of same size, or any one can be a scalar. 

 see also: NORMCDF, NORMINV 

Package: nan