xrange weirdness

[John W. Eaton]

On  3-Nov-2000, Andy Jacobson <address@hidden> wrote:

|       I noticed a strange difference between gplot and gsplot today.
|       When one explicitly specifies ranges for x, gplot appears to
|       somehow reset the gnuplot autoscaling upon termination and
|       gsplot does something completely different.  This causes
|       unpleasantness if one subsequently tries to do something like
|       plot(11:20,rand(10,1)), because the xrange is screwed up.
|       "gset autoscale x" does not fix the problem.
| 
|       To manifest the problem, try:
| 
|       gsplot [-1:1] [-1:1] 'sin(x*y)'
|       plot(11:20,rand(10,1))          

I'm not sure what Octave should do in this case.

If you type

  splot [-1:1] [-1:1] sin(x*y)
  plot '-'
  11.00000   0.83836
  12.00000   0.13866
  13.00000   0.79230
  14.00000   0.73427
  15.00000   0.10606
  16.00000   0.78780
  17.00000   0.18131
  18.00000   0.73035
  19.00000   0.16398
  20.00000   0.35331
  e

directly in gnuplot, you will see similar results.  Even with

  plot [*:*] [*:*] ...

or after

  set autoscale x
  set autoscale y

So maybe this is a bug in gnuplot?

|       I can't seem to find the code for gplot or gsplot anywhere in
|       the build tree.

They are handled by the parser.  Look in parse.y and pt-plot.cc.

jwe



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