gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] How to fill a region?

[Hans-Bernhard B. <br...@ph...>]

On Fri, 18 Jun 2004, Ding Li wrote:

> Hi,all
> 
> How do fill a region with some color which are connected by 3 or more 
> points,say (0,0),(1,0),(1,1)? eg. If I want to fill the region with red 
> color, how to do that?

Plot a datafile with those points 'with filledcurves'.

-- 
Hans-Bernhard Broeker (br...@ph...)
Even if all the snow were burnt, ashes would remain.

[Gnuplot-info] How to fill a region?

[Ding Li <di...@uc...>]

Hi,all

How do fill a region with some color which are connected by 3 or more 
points,say (0,0),(1,0),(1,1)? eg. If I want to fill the region with red 
color, how to do that?

Thanks

Ding

[Gnuplot-info] Gnuplot wiki updated to v4

[Lauren C. <la...@co...>]

Hello All, 

Just FYI, we've updated the gnuplot engine at http://gnuplot.flexkb.net to
version 4.0. Many thanks to all who donated their time to this excellent
piece of software.

The flexKb (which is a hybrid of the traditional wiki-style forum) provides
both latex and gnuplot scripting. It is open content - you can edit it with
your browser. Feel free to stop by and play with it. And, if you are
inclined, leave a gem or two of gnuplot knowledge for others to share. 

PS: Please note the domain name of the site recently changed, I see the link
at http://www.gnuplot.info/help.html is pointing to the old sciwikis
address. It is redirecting for now, but may not for the future. Hopefully
this note will find its way to the webmaster of gnuplot.info...


Best, 

Lauren Clarke
Director, 
Cornerstone Systems Northwest Inc.
www.cornerstonenw.com 

Re: [Gnuplot-info] gnuplot question

[Hans-Bernhard B. <br...@ph...>]

On Thu, 17 Jun 2004, Mariano G. Consoni wrote:

> about gnuplot, how can I change the foreground color of
> a boxes graphic when a jpg file is generated.  

The color is encoded in the 'linetype' argument, assuming your terminal
driver of choice supports coloured output at all.

-- 
Hans-Bernhard Broeker (br...@ph...)
Even if all the snow were burnt, ashes would remain.

Re: [Gnuplot-info] gnuplot

[Hans-Bernhard B. <br...@ph...>]

On Thu, 17 Jun 2004, Simone Fulle wrote:

> hello, I'd like to use the short cut for "Angstrom". Does this exist?

There is no pre-made short-cut symbol for that.  Whether such a symbol can
be generated at all depends on the terminal driver you're using.  
Enhanced-mode terminals (originally only PostScript; now others, too) and
TeX can do it by superposition of an 'o' above an 'A'.  TeX probably has
a special math-mode symbol for it as an alternative.

[That's setting aside the fact that Angstrom is an obsolote unit, and has
been for a couple of decades, so you probably shouldn't be using it any
more.]

> And is it possible to define the ylabel vertical? 

That too depends on the terminal driver being used.  As of version 4.0,
most major drivers to support rotated text, and will thus output the
ylabel in vertical orientation.

-- 
Hans-Bernhard Broeker (br...@ph...)
Even if all the snow were burnt, ashes would remain.

[Gnuplot-info] gnuplot question

[Mariano G. C. <mco...@mi...>]

Sorry for this e-mail and sorry for my poor english.  I have a question 
about gnuplot, how can I change the foreground color of
a boxes graphic when a jpg file is generated.  I was searching for it in 
google and i could not find it!
Thanks!

    Mariano.-

I hope you could understand my english.

-- 
---------------------------------------------------------------
  Mariano G. Consoni			nn...@mi...
  http://nno.minddebuggers.com
---------------------------------------------------------------

[Gnuplot-info] gnuplot

[Simone F. <Sim...@we...>]

hello, I'd like to use the short cut for "Angstrom". Does this exist? And is it possible to define the ylabel vertical? Thanks for your efforts and request Simone
__________________________________________________________________
Zeigen Sie Emotionen mit der WEB.DE Bild-SMS! Das Bild ist gratis,
Sie bezahlen nur den Versand. http://freemail.web.de/?mc=021196

Re: [Gnuplot-info] Symbol font in enhanced mode with png

[Martin D. W. <wei...@as...>]

On Tue, 15 Jun 2004 15:49:09 +0200 (CEST)
Hans-Bernhard Broeker <br...@ph...> wrote:

> On Tue, 15 Jun 2004, Martin D. Weinberg wrote:
> 
> > On Tue, 15 Jun 2004 13:42:09 +0200 (CEST)
> > Hans-Bernhard Broeker <br...@ph...> wrote:
> > 
> > > On Mon, 14 Jun 2004, Martin Weinberg wrote:
> > > 
> > > > I seem to have a problem accessing the symbol font in enhanced mode
> > > > with the png terminal.  Superscripts and subscripts work fine but
> > > > use of the symbol font gives me:
> > > > 
> > > > 	gdImageStringFT: Could not find/open font
> > > > 
> > > > I have installed symbol.ttf.   Has anybody got a clue?  Thanks!!
> > > 
> > > Installed it *where*?  How exactly is gnuplot informed about it?
> > 
> > I copied it to /usr/share/fonts/truetype, the dir which contains the
> > truetype fonts.  libgd is clearly able to find this path since it finds
> > the Arial font in this same directory, that I specified in the "set
> > terminal" command.
> 
> I suspect you overlooked updating the catalog file in that directory,
> then.  Generally speaking, it's probably not a good plan to tinker with
> the contents of directories owned by the distribution like that.  This
> kind of work is what the /usr/local hierarchy is for.
> 
> The libfreetype experts can probably enlighten your more thoroughly...
> 

So here is the scoop: libgd only uses path searching to find fonts.  The
reason that symbol wasn't found the first time is that I used the capital
name, e.g. "{/Symbol=18 k}", instead of symbol.   When I made the new
directory in /usr/local, I had both symbol.ttf and Symbol.ttf entries.

I do agree with you about adding stuff to /usr/local rather than /usr.

Anyway, everything is now working perfectly.  The advantage of writing
png directly rather than ps -> png is file size and better looking fonts.

Thanks again!

Re: [Gnuplot-info] Symbol font in enhanced mode with png

[Hans-Bernhard B. <br...@ph...>]

On Tue, 15 Jun 2004, Martin D. Weinberg wrote:

> On Tue, 15 Jun 2004 13:42:09 +0200 (CEST)
> Hans-Bernhard Broeker <br...@ph...> wrote:
> 
> > On Mon, 14 Jun 2004, Martin Weinberg wrote:
> > 
> > > I seem to have a problem accessing the symbol font in enhanced mode
> > > with the png terminal.  Superscripts and subscripts work fine but
> > > use of the symbol font gives me:
> > > 
> > > 	gdImageStringFT: Could not find/open font
> > > 
> > > I have installed symbol.ttf.   Has anybody got a clue?  Thanks!!
> > 
> > Installed it *where*?  How exactly is gnuplot informed about it?
> 
> I copied it to /usr/share/fonts/truetype, the dir which contains the
> truetype fonts.  libgd is clearly able to find this path since it finds
> the Arial font in this same directory, that I specified in the "set
> terminal" command.

I suspect you overlooked updating the catalog file in that directory,
then.  Generally speaking, it's probably not a good plan to tinker with
the contents of directories owned by the distribution like that.  This
kind of work is what the /usr/local hierarchy is for.

The libfreetype experts can probably enlighten your more thoroughly...

-- 
Hans-Bernhard Broeker (br...@ph...)
Even if all the snow were burnt, ashes would remain.

Re: [Gnuplot-info] Symbol font in enhanced mode with png

[Martin D. W. <wei...@as...>]

On Tue, 15 Jun 2004 13:42:09 +0200 (CEST)
Hans-Bernhard Broeker <br...@ph...> wrote:

> On Mon, 14 Jun 2004, Martin Weinberg wrote:
> 
> > I seem to have a problem accessing the symbol font in enhanced mode
> > with the png terminal.  Superscripts and subscripts work fine but
> > use of the symbol font gives me:
> > 
> > 	gdImageStringFT: Could not find/open font
> > 
> > I have installed symbol.ttf.   Has anybody got a clue?  Thanks!!
> 
> Installed it *where*?  How exactly is gnuplot informed about it?

I copied it to /usr/share/fonts/truetype, the dir which contains the
truetype fonts.  libgd is clearly able to find this path since it finds
the Arial font in this same directory, that I specified in the "set
terminal" command.

> How did you try to access it?

By using a specific enhanced font command, e.g. "{/Symbol=18 k}" for
kappa.

> And what computing platform are we talking about, anyway?

Debian Linux (sarge).

I *did* manage to get this to work by coping symbol.ttf to another
directory (I used /usr/local/share/fonts/truetype) and then set the
GDFONTPATH explicitly to
/usr/share/fonts/truetype:/usr/local/share/fonts/truetype. I'm not sure
why this worked but the default location did not, but there we have it. It
works wonderfully now.

Thanks all for your replies!

--Martin

Re: [Gnuplot-info] Symbol font in enhanced mode with png

[Hans-Bernhard B. <br...@ph...>]

On Mon, 14 Jun 2004, Martin Weinberg wrote:

> I seem to have a problem accessing the symbol font in enhanced mode
> with the png terminal.  Superscripts and subscripts work fine but
> use of the symbol font gives me:
> 
> 	gdImageStringFT: Could not find/open font
> 
> I have installed symbol.ttf.   Has anybody got a clue?  Thanks!!

Installed it *where*?  How exactly is gnuplot informed about it?
How did you try to access it?
And what computing platform are we talking about, anyway?

-- 
Hans-Bernhard Broeker (br...@ph...)
Even if all the snow were burnt, ashes would remain.

[Gnuplot-info] Symbol font in enhanced mode with png

[Martin W. <wei...@as...>]

Hi folks,

I seem to have a problem accessing the symbol font in enhanced mode
with the png terminal.  Superscripts and subscripts work fine but
use of the symbol font gives me:

	gdImageStringFT: Could not find/open font

I have installed symbol.ttf.   Has anybody got a clue?  Thanks!!

--Martin

Re: [Gnuplot-info] How to plot an arc through three point?

[Hans-Bernhard B. <br...@ph...>]

On Wed, 9 Jun 2004, Ding Li wrote:

> Hi,all
> 
> Is there a way to plot an arc through three point? say 
> (0,0),(1,0),(1,1)? Thanks

Well, you could plot them as a datafile with using one of the smoothing
options.  But that probably won't plot you an "arc" of the kind you're
after.  Keep in mind though that this is a plotting program, not an
illustrative art generator.

-- 
Hans-Bernhard Broeker (br...@ph...)
Even if all the snow were burnt, ashes would remain.

Re: [Gnuplot-info] Graphs inclusion

[Hans-Bernhard B. <br...@ph...>]

On Wed, 9 Jun 2004, SWlab wrote:

> * in a postscript term, is it possible to precise an offset for axis 
> labelling? I'd like my tics to be slightly closer from the axis than they 
> currently are.

The axis label has offsets for this, but the tic labels don't, so the 
answer is no.  But there may be a patch in our tracke to do this.

> * how can i set my xtics to be in, and ytics to be out ?

Can't.

-- 
Hans-Bernhard Broeker (br...@ph...)
Even if all the snow were burnt, ashes would remain.

[Gnuplot-info] How to plot an arc through three point?

[Ding Li <di...@uc...>]

Hi,all

Is there a way to plot an arc through three point? say 
(0,0),(1,0),(1,1)? Thanks

Ding

Re: [Gnuplot-info] Graphs inclusion

[SWlab <sw...@co...>]

> >> And a corollary: how could I draw a rectangle in a graph, for example as
> >> a background for a label ?
> >
> > If at all, then only by creating and plotting a manually adjusted box
> > from a datafile ('with boxxyerrorbars', filled).
>
> Or set arrow nohead ?

Now, that's hacking ;)

Well, guess I gonna have to edit my ps output, then...
While wondering about fine-tuning:
* in a postscript term, is it possible to precise an offset for axis 
labelling? I'd like my tics to be slightly closer from the axis than they 
currently are.
* how can i set my xtics to be in, and ytics to be out ?


-- 
Soil & Water Laboratory
Dept. of Biological & Environmental Engineering
Cornell University
ITHACA, NY 14853
Tel: (607)255.2463

Re: [Gnuplot-info] Graphs inclusion

[Dave D. <dde...@es...>]

Hans-Bernhard Broeker <br...@ph...> writes:

> On Wed, 9 Jun 2004, SWlab wrote:
>

>> And a corollary: how could I draw a rectangle in a graph, for example as a 
>> background for a label ?
>
> If at all, then only by creating and plotting a manually adjusted box
> from a datafile ('with boxxyerrorbars', filled).
>

Or set arrow nohead ?


dd
-- 
Dave Denholm              <dde...@es...>       http://www.esmertec.com

Re: [Gnuplot-info] libgd and libpng question

[Hans-Bernhard B. <br...@ph...>]

On Wed, 9 Jun 2004, Smith, Ryan H wrote:

> I'm trying to output my graphs in png format, but am not sure how to use the
> libgd and libpng libraries.  Do they need to be installed before compiling
> gnuplot, or does gnuplot use them at run time?  

They absolutely have to be present at install time.  You need them at
run-time only you installed them as shared libraries.

> And where would I
> change/include the path to the libraries so that gnuplot can use them?

The preferred option is to "properly install" them, i.e. put them in a
place where the system linker finds them by itself.  You may have to
change system configuration to that effect, e.g. by setting up environment
variables like LD_LIBRARY_PATH and LIBRARY_PATH.

See the README and INSTALL files for more details.

> I've installed these libraries in a non-standard folder
> (/opt/src/sftw/../../../lib/), which is the cause of my problem, I know.
> But that's the way it needs to be.

If that's "needed", your local needs are rather badly unusual...

-- 
Hans-Bernhard Broeker (br...@ph...)
Even if all the snow were burnt, ashes would remain.

[Gnuplot-info] libgd and libpng question

[Smith, R. H <Rya...@ph...>]

I'm trying to output my graphs in png format, but am not sure how to use the
libgd and libpng libraries.  Do they need to be installed before compiling
gnuplot, or does gnuplot use them at run time?  And where would I
change/include the path to the libraries so that gnuplot can use them?
I've installed these libraries in a non-standard folder
(/opt/src/sftw/../../../lib/), which is the cause of my problem, I know.
But that's the way it needs to be.

Thanks!

-Ryan

Re: [Gnuplot-info] Graphs inclusion

[Hans-Bernhard B. <br...@ph...>]

On Wed, 9 Jun 2004, SWlab wrote:

> Hi all,
> I'd like to include (superpose) a graph in a second one. Fiddling with 
> multiplots, margins, screen coordinates,etc. gives me more or less what I'd 
> need, but for one thing: the background of the included graph is transparent. 
> Is there a way to force it to a given color/pattern (term PNG or PS, BTW) ? 

You can 'clear' it, by the appropriately named command, if your terminal
driver supports it.  If it can do filled-box plots, it does.

> And a corollary: how could I draw a rectangle in a graph, for example as a 
> background for a label ?

If at all, then only by creating and plotting a manually adjusted box
from a datafile ('with boxxyerrorbars', filled).

-- 
Hans-Bernhard Broeker (br...@ph...)
Even if all the snow were burnt, ashes would remain.

[Gnuplot-info] Graphs inclusion

[SWlab <sw...@co...>]

Hi all,
I'd like to include (superpose) a graph in a second one. Fiddling with 
multiplots, margins, screen coordinates,etc. gives me more or less what I'd 
need, but for one thing: the background of the included graph is transparent. 
Is there a way to force it to a given color/pattern (term PNG or PS, BTW) ? 
And a corollary: how could I draw a rectangle in a graph, for example as a 
background for a label ?
Thanks in advance


-- 
Soil & Water Laboratory
Dept. of Biological & Environmental Engineering
Cornell University
ITHACA, NY 14853
Tel: (607)255.2463

Re: [Gnuplot-info] Windows gnuplot exits when you press the "Delete" key on a blank line

[Hans-Bernhard B. <br...@ph...>]

On Tue, 1 Jun 2004, Richard C. Yeh wrote:

> I'm running gnuplot 4.0 patchlevel 0 on Windows XP Professional SP1.
> 
> This is to ask if there's any way to prevent gnuplot from exiting if I 
> press the "[Forward]-Delete" key on a blank line.

Ouch, now that's a cute bug you've found there ;-)

> I suppose that this is the analog of logging out by pressing [Ctrl]-D, 

It quite definitely is.  That's how function keys receive their meaning:
by mapping them to their corresponding Emacs basic editing key, and yes,
that's Ctrl-D for the "Delete" key on PC keyboards.

The bug then is that Ctrl-D is interpreted as "End-of-File" somewhere,
which it *really* shouldn't be, and certainly not on Windows.

-- 
Hans-Bernhard Broeker (br...@ph...)
Even if all the snow were burnt, ashes would remain.

Re: [Gnuplot-info] Box plots

[Hans-Bernhard B. <br...@ph...>]

On Tue, 1 Jun 2004, Navarro, Fernando wrote:

> Is there a way to generate statistical box plots (sometimes called box
> and whiskers plots) with gnuplot?  

If the "with candlesticks" style is not what you're looking for, then
gnuplot doesn't have it at all.

-- 
Hans-Bernhard Broeker (br...@ph...)
Even if all the snow were burnt, ashes would remain.

[Gnuplot-info] Box plots

[Navarro, F. <fer...@lm...>]

Is there a way to generate statistical box plots (sometimes called box
and whiskers plots) with gnuplot?  

Thanks,
Fernando

[Gnuplot-info] Windows gnuplot exits when you press the "Delete" key on a blank line

[Richard C. Y. <rc...@co...>]

I'm running gnuplot 4.0 patchlevel 0 on Windows XP Professional SP1.

This is to ask if there's any way to prevent gnuplot from exiting if I 
press the "[Forward]-Delete" key on a blank line.

I suppose that this is the analog of logging out by pressing [Ctrl]-D, but 
because the "[Forward]-Delete" key on my keyboard is close to several other 
oft-used keys (such as [Ins], for pasting, and [Home] and [End] for moving 
within a line), I have inadvertently exited the program a couple of times 
by accidentally hitting this key instead of one nearby.  Of course, there's 
no confirmation or save dialog to protect the clumsy user who failed save 
early or save often.  But, in few other cases is it possible to wipe out a 
few minutes of work "with just one click", or, in this case, 
keystroke.  [Ctrl]-D actually requires your hand to stretch.

Richard