c = minus(a,b) : computes the difference of iFunc objects
@iFunc/minus (+) function to compute the difference of functions
when one of the argument is a character string, it is used as-is in the
operator expression.
input: a: object or array (iFunc or numeric)
b: object or array (iFunc or numeric)
output: c: object or array (iFunc)
ex: c=a-1;
Version: Aug. 22, 2017
See also iFunc, iFunc/minus, iFunc/plus, iFunc/times, iFunc/rdivide