[Gnuplot-info] special plot need -- splot matrix from not-that-regularly organized data file

[Jon <dev...@gm...>]

I have a data file organized as the following

d channel ...

k = 1
0.34  0.89   0.99
0.23  0.67  0.02
0.65  0.99  0.45
k=2
0.45  0.78  0.99
0.23  0.78  0.86
0.12  0.43  0.23
...

m channel ...

k=1
...

I need to skip the first 3 lines then splot the first set of data forming 3
by 3 matrix, and then skip a line, splot the second set of data forming 3 by
3 matrix again ... How can I do that?

If I use splot 'file' ev 4:6 matrix , then it complains that
Matrix does not represent a grid,

Can anybody explain where the above command goes wrong?

Thank you very much!!