How to let output terminal NOT show message and warnings of gnuplot ?

[Linhuihang]

Gnuplot prints its message and warnings to output terminal. How to disable?

gnuplot> se
^
line 0: unrecognized option - see 'help set'.

gnuplot> t terminal wxt title "Figure 1" size 560,420 enhanced font "Sans,10"
^
line 0: invalid command

gnuplot> se
^
line 0: unrecognized option - see 'help set'.

gnuplot> t terminal wxt title "Figure 1" size 560,420 enhanced font "Sans,10"
^
line 0: invalid command

Warning: empty x range [0:0], adjusting to [-1:1]
Warning: empty y range [2.23126e+06:2.23126e+06], adjusting to [2.20895e+06:2.25357e+06]

[alandefreitas]

The pipe is created here

matplotplusplus/source/matplot/backend/gnuplot.cpp

Lines 66 to 71 in 8dbea7d

	// Open the gnuplot pipe_
	if constexpr (windows_should_persist_by_default) {
	pipe_ = POPEN("gnuplot --persist", "w");
	} else {
	pipe_ = POPEN("gnuplot", "w");
	}

But there's no option to redirect the errors somewhere else.

You could patch this backend to do that or patch the plots so that there are no errors.