If PWEV has a duration of 180 seconds (and therefore also FMOSC and TONE), then also CONST and RAMP must have durations of 180 seconds, because otherwise MULT and DIFF (in the second line) will stop computing after the end of CONST or RAMP:
Audacity Nyquist “generate” and “process” plugins have a different notion of WARP. In a “generate” plugin the default duration is 1.0 seconds, while in a “process” plugin (and also in the Audacity “Nyquist Prompt” window) the default duration is equal to the length of the Audacity selection. This means that in a “generate” plugin (OSC 60 2.0) produces a sinewave of two seconds, while in a “process” plugin (OSC 60 2.0) produces a sinewave two times as long as the selected part of the Audacity track. This is also true for all other Nyquist functions with an optional “duration” argument.
Tested with Audacity_1.3.14-alpha on Debian Linux.