INT64 INT64 Convert to Signed 64-bit Integer

Usage

Converts the argument to an signed 64-bit Integer.  The syntax
for its use is

   y = int64(x)

where x is an n-dimensional numerical array.  Conversion
follows the general C rules (e.g., if x is outside the normal
range for a signed 64-bit integer of [-2^63,2^63-1], the least significant
64 bits of x are used after conversion to a signed integer).  Note that
both NaN and Inf both map to 0.
