Debugging in interactive gnuplot

Question

I have a plot script that doesn't work in some cases. How can I use the interactive mode of gnuplot to debug user defined functions, i.e. just call them with some literal argument to see if they are evaluated correctly?

On a similar note, is there a way to make gnuplot verbose when processing a script?

Answer 1

I managed to find how to test functions or values in interactive gnuplot, there is a handy print. You use it like this:

print myFunction(1)

I still don't know how to run gnuplot in a verbose mode, anyone?