Very Computer

I'm trying to plot photon path traversals around probabilisitic
singularity regions. The trick is, I need to be able to place all on
the same graph.

What I'd like gnuplot to do is:
  1) plot the dozen or so singularity regions, with color 1
  2) plot the single photon path traversal, with color 2
...all on the same graph / grid space.

Also if possible, I'd also like to draw a boundary around the
collection of points defining each of the singularity regions, and
fill each in with a certain color.

I've looked at the 'multiplot' command. However, it doesn't seem to
allow me to overlay the plots on top of each other. And I don't see
how to draw the singularity boundary regions, nor fill them in with a
particular color.

Thanks for your help!
Alex

On 26 Jun 2003 10:48:25 -0700, Alex Majora scribbled:
: I'm trying to plot photon path traversals around probabilisitic
: singularity regions. The trick is, I need to be able to place all on
: the same graph.

: What I'd like gnuplot to do is:
:   1) plot the dozen or so singularity regions, with color 1
:   2) plot the single photon path traversal, with color 2
: ...all on the same graph / grid space.

: Also if possible, I'd also like to draw a boundary around the
: collection of points defining each of the singularity regions, and
: fill each in with a certain color.

: I've looked at the 'multiplot' command. However, it doesn't seem to
: allow me to overlay the plots on top of each other. And I don't see
: how to draw the singularity boundary regions, nor fill them in with a
: particular color.

`set multiplot` can be (ab)used to do what you want, by disabling all
automatic scaling and sizing. That said, why would something like
plot 'dataset1', 'dataset2', f3(x)
be unsatisfactory for you? See the examples in `help plot`.

The `filledcurves` plotting style available in the development version
may do what you want for filling in a region. Post-processing (either
manual, using a drawing program like xfig, or automatic (see the links at
www.gnuplot.info)) can do this as well, if you don't have access to the
development version. You're on your own for calculating the boundaries,
though, if I understand correctly what you're asking.

THeo

How do you intend to display such a region?  gnuplot only plots lines
in its release version, so it could only show the boundaries of such
regions...

Quote:>   2) plot the single photon path traversal, with color 2

That one should be simple.

Quote:> ...all on the same graph / grid space.

... and this, too.  You don't even need multiplot to do it.  Just list
several plottable datasets in a single 'plot' command.

Quote:> Also if possible, I'd also like to draw a boundary around the
> collection of points defining each of the singularity regions, and
> fill each in with a certain color.

Finding that boundary cannot be the task of gnuplot --- that's up to
you.  Filling it in can't be done with the release version.  There
'with filledcurves' in the development version, but that's still
a rather experimental feature.

--

Even if all the snow were burnt, ashes would remain.

Yes, simple boundaries will suffice. Is there a gnuplot way to bound
all points of a data set?

I am concerned primarily about exceeding the command line limit?
Placing all plotting information for each data set into one 'plot'
command will stretch out to 1024 characters or so. Is there a limit?
Being able to issue successive 'plot' commands would be easier to
manage -- but I'm happy just to have a way that works!

Also, is there a way to have gnuplot display the coordinate grid space
in the graph? I know it allows you to have tick marks on the axes; can
it also draw the background grid? (I didn't see this in the FAQ.)

Thanks, Hans and Theo for your informative help and patience with a
gnuplot beginner. With what you've told me, I can get very far towards
what I'm trying to do.

Alex

No.  That would have to be done by your own data analysis routine(s).
gnuplot is not a tool for numerical nor graphical analysis, by design.

Quote:> I am concerned primarily about exceeding the command line limit?
> Placing all plotting information for each data set into one 'plot'
> command will stretch out to 1024 characters or so. Is there a limit?

No.  The internal buffer auto-expands if necessary.

Quote:> Also, is there a way to have gnuplot display the coordinate grid space
> in the graph? I know it allows you to have tick marks on the axes; can
> it also draw the background grid? (I didn't see this in the FAQ.)

        set grid

(unsurprisingly) does that.

--

Even if all the snow were burnt, ashes would remain.