StackTraceBuilder

A stack trace is displayed to the user when an error occurs in running code. Example:

division by zero error while observer running / called by plot 'plot 1' setup code called by RESET-TICKS called by procedure SETUP called by Command Center

Entries in stack traces can come from different places.

In the example,

• "/" is the individual primitive in which the error occurred
• "plot 'plot 1' setup code" is an anonymous procedure in a plot
• "RESET-TICKS" is not a procedure, but a command that can trigger the execution of procedures (see also tick, setup-plots, update-plots)
• "SETUP" is an ordinary procedure
• "Command Center" is the display name of the dummy top level procedure wrapped around the user's code.