Re: [Gnuplot-info] plot and splot with vectors

[Ethan A M. <merritt@u.washington.edu>]

On Monday 27 March 2006 05:06 am, Hans-Bernhard Br=F6ker wrote:
> Donald J Bindner wrote:
> >>> plot "vec.dat" w vec
> >>> It works in my older version, but in the CVS pull, there is no
> >>> arrow head.
>=20
> I did some investigating in the meantime.  Turns out this is an utter=20
> mess, created by about 4 separate attempts at getting option parsing for=
=20
> 'with vectors' to work piled on top of each other.
>=20
> The core problem is that the '{s}plot' parser now only initializes the=20
> relevant data structure for the arrows in a part of the 'while still=20
> some command-line text left to parse' that is never reached in the
> above case.

I won't try to defend the "utter mess", but I think this particular
failure was introduced when we removed the initialization code from
all the <foo>_parse() routines so that successive calls were=20
incremental.  The 2D and 3D plot structures should properly have
their corresponding fields initialized to something reasonable.
Such initialization certainly can't hurt, and I'll add it to the
respective allocation routines cp_alloc() and sp_alloc().

This may actually allow us to remove some of the "utter mess", but
I won't do that without further inspection or testing.

=2D-=20
Ethan A Merritt
Biomolecular Structure Center
University of Washington, Seattle 98195-7742