If control sequence under Gnuplot

Question

How to perform control sequences under Gnuplot please? I need to make something like

if (x == nan)
  set xrange[]

else
  set xrange[10:30]

I tried something like

( x > 100000 ) ?  (set xrange[]) : (set xrange[10:30])

... buth without success! I spent hours trying to solve this!! Any help please? At worst I can create a shell script an manage this, but I think there should be some control sequences to fix this.

Where does x come from? gnuplot has an if (...) { } else {} construct. — Christoph
– Christoph, Commented Dec 3, 2013 at 19:43
Hi Christoph! In fact I have my own script that input 'x' as a parameter to gnuplot file. — Courier
– Courier, Commented Dec 3, 2013 at 19:46
So what about if (x > 10000) { set xrange[*:*] } else { set xrange[10:30]}? — Christoph
– Christoph, Commented Dec 3, 2013 at 19:50
As you suggest, I tried this 'if(2==3){ set xrange[] } else {set xrange[10:30]}', but it does not work. — Courier
– Courier, Commented Dec 3, 2013 at 19:51
What do you mean with 'doesn't work'? For me it works fine, but requires version 4.6. But set xrange [] does nothing, to use autoscaling use e.g.set xrange[*:*] or set autoscale x. — Christoph
– Christoph, Commented Dec 3, 2013 at 19:53

Christoph · Accepted Answer · 2013-12-03 20:09:15Z

35

For gnuplot 4.4.4 the if statement must be on a single line:

if (x > 10000) set autoscale x; else set xrange [10:30]

or use \ to continue on the next line.

if (x > 10000) \
    set autoscale x; \
else \
    set xrange [10:30]

Since 4.6.0 gnuplot can use brackets to delimit the branches:

if (x > 10000) {
    set autoscale x
} else {
    set xrange [10:30]
}

answered Dec 3, 2013 at 20:09

Christoph

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