Pseudofile for vectors

[Peter D. <pc...@wi...>]

I'd like to detect whether plot/splot has been called 'with vectors'
and generate an extra column of data from the pseudofile '+'.

Problem is that by the time df_generate_pseudodata() is called,
df_current_plot isn't set; so I can't simply check whether
df_current_plot->plot_style == VECTOR.

Is there any other way to determine the plot style other than mucking
around in the option parser to set a global?


P.S. The attached patch dodges the issue entirely by simply producing
two columns of data; but this results in superfluous data for
one-variable functions.