Saves the elements of the floatvalue array in a file.
Usages: save(file_name)
: save(file_name, offset [, size
])
where file_name is the name of the file into which the elements are
saved; offset is the number of elements to skip, from the
floatvalue array, before saving; and [, size] is an
optional parameter, which specifies the number of elements to be saved.