FWRITE FWRITE File Write Function

Usage

Writes an array to a given file handle as a block of binary (raw) data.
The general use of the function is

  n = fwrite(handle,A)

The handle argument must be a valid value returned by the fopen 
function, and accessable for writing. The array A is written to
the file a column at a time.  The form of the output data depends
on (and is inferred from) the precision of the array A.  If the 
write fails (because we ran out of disk space, etc.) then an error
is returned.  The output n indicates the number of elements
successfully written.
