Re: [Gnuplot-info] splot matrix omitting the first row/column

[kalispera <fan...@gm...>]

To omit a column in a matrix I haven't any elegant solution but the following
trick:

I haven't change the value of the column I want to omit so that I can
discard them using 'using' and the ternary '?'

For example:

My matrix is:

0.5     6     1     1
1.5     5     4     6
2.5     0     3     9

I don't want to plot the first column. I manage to change the value of it.
In this example I can change the sign because all the points are superior or
equal to 0.

-0.5     6     1     1
-1.5     5     4     6
-2.5     0     3     9

Then the 'splot' query would look like this:

splot 'example.dat' matrix using 1:2:($3<0 ? 1/0 : $3)

Because 1/0 is undefined the terms inferior to 0, i.e., the 1st column,
gnuplot will ignore these points.

If someone knows a smarter solution, I'm a taker!

gnuplot rules!

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