[Gnuplot-py-users] Notice: Cannot contour non grid data. Please use "set dgrid3d"

Hi,

when I run the test.py script the following warning appears several times:

  Notice: Cannot contour non grid data. Please use "set dgrid3d".

Is there a way to get rid of this message? I am using the latest sources
from the SVN repository.

If anyone can help me out, or point me to where to look in the code, I
would be very happy.

Thanks,
Johannes

$ python test.py
...
gnuplot> set parametric
gnuplot> set data style lines
gnuplot> set hidden
gnuplot> set contour base
gnuplot> set xlabel "x"
gnuplot> set ylabel "y"
Notice: Cannot contour non grid data. Please use "set dgrid3d".
gnuplot> splot "/tmp/tmpKGm5yj.gnuplot/fifo" notitle
Same thing, saved to a file
Press return to show results...

Notice: Cannot contour non grid data. Please use "set dgrid3d".
gnuplot> splot "/tmp/tmp9ReqTN"
Same thing, inline data
Press return to show results...

gnuplot> splot "-" notitle
The same thing using binary mode
Press return to show results...
Notice: Cannot contour non grid data. Please use "set dgrid3d".

...