NUMEL  NUMEL Number of Elements in an Array


Usage
 
 Returns the number of elements in an array x, or in a subindex
 expression.  The syntax for its use is either
 
    y = numel(x)
 
 or 
 
    y = numel(x,varargin)
 
 Generally, numel returns prod(size(x)), the number of total
 elements in x.  However, you can specify a number of indexing
 expressions for varagin such as index1, index2, ..., indexm.
 In that case, the output of numel is 
 prod(size(x(index1,...,indexm))).
 