Re: [Gnuplot-info] Question on variables

[Thomas S. <t.s...@fz...>]

> Dear listmembers,
> is there any means to delete a variable you are using in a script?
> Say, you have the variable
> L=<somevalue>
>
> at the beginning of a gnuplot - scriptfile. You reach the end of this file
> and 
> you would like to say
>
> unset L (but this definitively does not work)

because 'set L=1' is no valid syntax, 'unset L' doesn't work either,
instead, it should be 'undefine L' or 'delete L' (which are not
existing up to now).

> is there any means to achieve this? The reason why I am asking is the
> feature 
> of emacs-gnuplot mode and octave to keep an open gnuplot session. If you
> have 
> some condition like
>
> if (exists (L)) <do something>
>
> in your script, this only works the very fist time you source the script, 
> because from then on the variable is defined.
>
> Maybe someone has a workaround, I did not find one, maybe there's a way to 
> delete the variable and I didn't find either.

there is code ('cleanup_udvlist()') in 'parse.c' which would delete a
user defined variable once the 'udv_undef' element of the variables
structure is set to TRUE.

in principle it should be possible to delete a variable, but only with some
modification of the source code.

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