[Gnuplot-info] unexpected difference between plot and splot of binary files with unstructured data

[cédric o. <ced...@gm...>]

Hi,

I have found a interesting comment on the web explaining how to plot
unstructured mesh written in a binary file in gnuplot. I knew to do
that in ascii but I have been looking for the binary possibility for a
while.

The command is for instance the following

plot 'file.dat' binary record=(15,-1) format='%float' u 1:2:3 w l palette

I wrote the binary file file.dat using octave (fwrite(file,vector)).

The 15 is because I plot cells of 5 points of two coordinates + the
value at the point.

cell=[ptA ptB ptC ptD ptA]

vector=[ptAx ptAy ptAval ptBx ptBy ptBval ptCx ptCy ptCval  ptDx ptDy
ptDval  ptAx ptAy ptAval ...];

The plot command gives expected results (I would expect that I have
used an ascii filename). However, the splot command does not as some
cells of the unstructured mesh are now connected although they should
not.

Does anybody know what I am missing.

Thank you very much,

Cédric