The get_array() function takes 2 arguments to retrieve an IFEFFIT array Program Variable into an array (some languages call these lists) in the calling language. The first argument is the name of the variable in the IFEFFIT name space, and the second is the array itself (type double*). To comply with the IFEFFIT naming rules, the variable name needs to contain a dot `.'. The value returned by get_array() will be the number of points in the array.