Application diagnostic aids in APL/700

Diagnostic aids in Burroughs APL/700 include system functions for setting, resetting and querying Trace, Stop, and Monitor conditions on lines of user-defined functions. Trace and Stop have similar effects to those available in other APL systems. Trace also returns type and shape information. Monitor gives the dynamic number of executions of individual lines and the computer time consumed therein. The benefit from monitoring to APL applications typically averages 30% to 50% reduction in processing time, since the most costly lines can be easily identified for potential algorithm tuning.