MINUS MINUS Overloaded Addition Operator

Usage

This is a method that is invoked when two variables are subtracted
and is invoked when you call

   c = minus(a,b)

or for

   c = a - b

MINUS MINUS Subtraction Operator

Usage

Subtracts two numerical arrays (elementwise).  There are two forms
for its use, both with the same general syntax:

  y = a - b

where a and b are n-dimensional arrays of numerical type.  In the
first case, the two arguments are the same size, in which case, the 
output y is the same size as the inputs, and is the element-wise
difference of a and b.  In the second case, either a or b is a scalar, 
in which case y is the same size as the larger argument,
and is the difference of the scalar to each element of the other argument.

The type of y depends on the types of a and b using the type 
promotion rules.  The types are ordered as:
  1.  uint8 - unsigned, 8-bit integers range [0,255]

  2.  int8 - signed, 8-bit integers [-127,128]

  3.  uint16 - unsigned, 16-bit integers [0,65535]

  4.  int16 - signed, 16-bit integers [-32768,32767]

  5.  uint32 - unsigned, 32-bit integers [0,4294967295]

  6.  int32 - signed, 32-bit integers [-2147483648,2147483647]

  7.  float - 32-bit floating point

  8.  double - 64-bit floating point

  9.  complex - 32-bit complex floating point

  10.  dcomplex - 64-bit complex floating point

Note that the type promotion and combination rules work similar to 
C.  Numerical overflow rules are also the same as C.
