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Old 05-27-2010, 03:39 AM   #1
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Registered: May 2010
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Question Ubuntu 9.10 X11 linking and on-screen plotting

Hi all,
I use Ubuntu 9.10, and have a problem linking PGPLOT to X11 to view the output of some plottings on-screen.
I already had libx11-dev and PGPLOT installed, and found the path to and at /usr/lib.
I successfully link to this library as
f77 -o simple_ehsan simple.f -L /usr/lib -lpgplot -L /usr/lib -lX11
But, when running the code called simple_ehsan which calls pgplot, I receive the following error message:

ehsan@ehsan:~/programs/pgmoog/testprog$ ./simple_ehsan
Graphics device/type (? to see list, default /xwin): /xwin
PGPLOT /xw: cannot connect to X server [0]

I also receive the same complaint when trying to run /usr/bin/xclock:
root@ehsan:/usr/bin# ./xclock
Error: Can't open display: 0

I cannot figure out with the on-screen display problem I have. I also have to mention that I'm an Ubuntu newbie.
Best wishes.
Old 05-29-2010, 08:38 AM   #2
Registered: Jul 2007
Location: Scunthorpe, UK
Distribution: Ubuntu 8.10; Gentoo; Debian Lenny
Posts: 961

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Give google a go; you'll love it:
1 members found this post helpful.
Old 08-14-2010, 07:00 PM   #3
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Registered: May 2010
Posts: 10

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Hi all. The last replies were perfect. I really thank you.
I use Ubuntu 10.04. This time, I need to link Xext library to another program to generate on-screen outputs. the link is supposed to be:
-L/usr/lib/pgplot5 -lpgplot -L/usr/lib -lX11 -lxcb -lXau -lXdmcp -lpng -lz -lXext
But the last term -lXext gives an error:
/usr/bin/ld: cannot find -lXext
I tried to install x11proto-xext-dev from synaptic but nothing improved.
Note that locate Xext gives
So my linking path must be correct.

Do you have any idea?


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