SDDS_table: Address of the SDDS_TABLE structure for the data set.
array_name: A NULL-terminated character string giving the name of the array to
return.
elements: The number of values returned in the array.
return value: On success, returns a pointer double array containing the values in the SDDS_ARRAY structure
after being cast to the double datatype. On failure, returns NULL and records an error
message.