20020314: GEMPAK use of X displays

Maisa,

Your X display must have the default visual set to 8 bits. You can check this
using the X11 program "xdpyinfo". Look for the default visual id and verify
that it is set to 8 bits/pseudocolor.

If you are using Linux, then use KDE, TWM, FVWM etc as the window manager and
not GNOME since GNOME will allocate all colors as read-only.

You can also use the "freeColors" program in $GEMEXE to tell you how many colors
you have available.

You can find other help archives at:

http://www.unidata.ucar.edu/packages/gempak/help_and_documentation/ghgempak.html

Steve Chiswell
Unidata User Support



On Wed, 13 Mar 2002, Maisa Rojas wrote:

> Chiz,
>
> I am an (extremely) new user of gempak. I was trying to get familiar with
> the plotting routines. but I can't open a window for the display. So I
> tried to run the example I found in:
>
> /usr/local/src/gempack/gempak/txt/gemplt/Chap18.txt, and I get the same
> error as when trying to run say gdmap or another program.
>
>
> Creating process: xw for queue 360455
>   GSDEVA - iret  -46
>  [GEMPLT -46]  NCLRAL - Can not allocate read/write colors.
>
> The step preceding the eroro are the following:
>
>
> [enso:~]% atest
>  Enter HELP for a list of subroutines and commands.
> GPLT>ginitp
>  GINITP - Enter mode:
> 1
> Creating process: gplt for queue 327686
>  GINITP - istat, iret  0 0
>  [GEMPLT 0]  NORMAL - Normal.
> GPLT>gsdeva
>   GSDEVA - Enter device:
> xw
>  Enter iunit
> 1
>  Enter filnam
> gempak.xw
>  Enter itype
> 2
>  Enter xsize
> 500
>  Enter ysize
> 500
> Creating process: xw for queue 360455
>   GSDEVA - iret  -46
>  [GEMPLT -46]  NCLRAL - Can not allocate read/write colors.
>
>
>
> this might be something very trivial, but trying for the first time to get
> acquainted with a new software makes things a lot more difficult!
> I would greatly appreciate a hint on this!
>
> Maisa
>
> -------------------------------------------------
> Maisa Rojas Corradi
> Departamento de Geofisica
> Universidad de Chile
> 56-2-678 4302
>