splot contours: how to silence a bogus warning?

[Dima K. <gn...@di...>]

Hi. I'm probably doing this wrong, but in case I'm not, can somebody
give me a pointer?

I'm making an splot with "set view map". There're two things in the
splot command:

- gridded data. this is for contours

- a line. the is just another thing to plot; no contours needed or
  wanted

Gnuplot really wants to contour everything, so it gives me a warning
aobut not being able to contour the line:

  "/tmp/tst.gp" line 15: warning: Cannot contour non grid data. Please use "set dgrid3d".

The plot works otherwise. How can I tell gnuplot what specifically I
want contoured? A demo script:


set view map
set contour surface
set cntrparam levels incremental 10,1,20
splot '-' matrix with lines nosurface ,'-' using 1:2:3 notitle with lines lw 3
21.116659897839263 19.791039827138583 18.227675240475808
17.237090114458017 16.05638264955801 14.720006247692512
13.875609237866147 12.820842598325108 11.685987645475555

e
.539 .853 0.0
0 .1706 0.0
0 .2986 0.0
e


Thanks!