Function: divide(gradient[0](minus(mean(numbers("yxx") if numbers("xxy") > numbers('xry') else numbers('yxr'), numbers('xry')), numbers('yxr') if numbers("yxx") > numbers("xxy") else numbers('xry'))), minus(mean(numbers("xxy") if numbers('xry') > numbers("yxx") else numbers('yxr'), numbers('xry')), numbers("yxx") if numbers('xry') > numbers("xxy") else numbers('yxr')))
