[Gnuplot-info] help needed on a special compare and if task

[Jon <dev...@gm...>]

Dear All,

I use macro to control whether output to a file or on screen by defining a
variable debug. I would like to output a string on screen to remind me where
the output is by writing code like

debug = ''
print (debug=='#' ? 'output in file' : 'output on screen')

However, gnuplot complains that

Non-numeric string found where a numeric expression was expected

How can I possibly circumvent this error and get what I want, thanks!

Sincerely,
Jon