PMAX

This operation takes a complex number from the top of the stack and interprets that complex number as X and Y coordinates. It then uses that point as the upper right hand point for a subsequent plot and stores that information in the plot parameters, found in a variable called PPAR in the current directory. The existing plot maximum which may be specified in an existing PPAR variable will be changed and then PPAR is stored, replacing the old value. If PPAR did not exist prior to executing these operations, a new PPAR variable is created. Its contents will be defaults except for the plot maximum which is specified from the stack.