REM  REM Remainder After Division


Usage
 
 Computes the remainder after division of an array.  The syntax for its use is
 
    y = rem(x,n)
 
 where x is matrix, and n is the base of the modulus.  The
 effect of the rem operator is to add or subtract multiples of n
 to the vector x so that each element x_i is between 0 and n
 (strictly).  Note that n does not have to be an integer.  Also,
 n can either be a scalar (same base for all elements of x), or a
 vector (different base for each element of x).
 
 Note that the following are defined behaviors:
   1.  rem(x,0) = nan@
   2.  rem(x,x) = 0@ for nonzero x
   3.  rem(x,n)@ has the same sign as x for all other cases.
 Note that rem and mod return the same value if x and n
 are of the same sign.  But differ by n if x and y have 
 different signs.
 