The ABS function returns the absolute value of its argument.

The value for which the absolute value is desired. If *
X*
is of complex type, ABS returns the
magnitude of the complex number:

If *
X*
is of complex type, the result is returned as single-precision, floating-point type. For all other types, the result has the same type as *
X*
. If *
X*
is an array, the result has the same structure, with each element containing the absolute value of the corresponding element of *
X*
.