gnuplot-py-users Mailing List for Gnuplot.py

James S. Martin writes:
> I am trying to figure out how to plot multiple sets of file data on
> the same graph without using a replot.
[...]
> p1=Gnuplot.File("file1",title="line1",using=9)
> p2=Gnuplot.File("file1",title="line2",using=10)
> 
> lines.append(p1)
> lines.append(p2)
> 
> 
> g.plot(lines)

Yes.  Since Gnuplot.plot() is defined to take a variable number of
parameters, you need to arrange that each of your PlotItems is a
separate parameter to the plot() method.  Do either

    g.plot(p1, p2)

or

    lines = [p1,p2]
    apply(g.plot, lines)

or (if you are using Python 2.0 or later)

    lines = [p1,p2]
    g.plot(*lines)

Michael

--
Michael Haggerty
hag...@jp...

First off thanks for gnuplot-py, it's helped me concentrate on my code 
w/out worrrying about Gnuplots messy syntax.

I am trying to figure out how to plot multiple sets of file data on the 
same graph without using a replot.

I notice that if I do this it doesn't work because the _add_to_queue 
thinks it is a data array and not an array of instances.  I am trying to 
plot multiple columns from the same or different files on the same graph 
and I can't think of how to do it without using replot.  Is there a 
better way?



p1=Gnuplot.File("file1",title="line1",using=9)
p2=Gnuplot.File("file1",title="line2",using=10)

lines.append(p1)
lines.append(p2)


g.plot(lines)



Thanks,

James

Hi Johnny

Yes, you will need to satisfy all dependecies. Let's
do something. I'll help you install gnuplot outside
the list (to avoid going too off-topic) and then 
we come back to the list if there are gnuplot-py 
specific issues :-)


-- leo

> I was trying to install gnuplot, but it seems like
> there are alot of dependencies that are associated
> with gnuplot.
> 
> Is there a package where it contains all the files I
> would need to install it? Or do i have to install each
> dependency one by one?
> 
> Thanks.
> 
> Johnny

On Wed, 9 Oct 2002, [iso-8859-1] Johnny boi wrote:

> I was trying to install gnuplot, but it seems like
> there are alot of dependencies that are associated
> with gnuplot.
>
> Is there a package where it contains all the files I
> would need to install it? Or do i have to install each
> dependency one by one?
It depends from your Linux Distribution.  In Debian GNU/Linux this
is done by

      apt-get install gnuplot

automagically.

Kind regards

         Andreas.

Hi Leo,

I was trying to install gnuplot, but it seems like
there are alot of dependencies that are associated
with gnuplot.

Is there a package where it contains all the files I
would need to install it? Or do i have to install each
dependency one by one?

Thanks.

Johnny

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> I was wondering is gnuplot-py compatible with wxPython?

It is actually independent. Gnuplot-py talks 
to gnuplot and gnuplot does the plotting, opens
windows, etc (it is a "wrapper" to gnuplot)

> I'm trying to plot data with real time.

Yes, you can do that. You loop within 
python, grab the data and send it to 
gnuplot using gnuplot-py. No problem 

:-)
-- leo

Hi Leo,

I'll try using rpm's, as soon as I finish downloading the required file(s).

I was wondering is gnuplot-py compatible with wxPython?

I'm trying to plot data with real time.

Thank you.

Johnny



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On Fri, 4 Oct 2002, Johnny boi wrote:

> Hello again Leo,
> 
> I tried typing "gnuplot" in the console, and all I get
> is:
> [root@localhost root]# gnuplot
> bash: gnuplot: command not found
> [root@localhost root]#

Yeah. It probably installed the binary in a place
not included in you path. If this is the case
it is fixable:

locate gnuplot |grep bin

will probably tell you where it is, but then you'd have
to either mofify the global path (/etc/profile) or do i for each user
(~/.bash_profile).

Much easier would be to use the packaging sysutem, which
takes care of everything for you. You can go to an rpmfind.net
mirror, such as: http://speakeasy.rpmfind.net
Search for gnuplot and get a binary package for your distribution
(in your case RH 7.1, package name ends in i386.rpm)

Download this, and run as root: "rpm -Uvh package-name"

That's it, it sould run after that.

If you are thinking of working a lot in your system, it's worthwile
upgrading, RH 7.1 is fairly old and Linux went a long way. As I 
said, Mandrake would probably best shot. Installing this package
would mean opening the control panel, going to software managment,
choosing install software, and typing gnuplot. More, Mandrake's 9
installation has a "scientific workstation" option that installs
gnuplot and other nice goodies by default.

Anyway, my 2cts, I strongly recommend sticking to the RPM packages
whenever possible. RPM takes care of the software (installs/uninstalls
properly, etc)

> Should I install and use Numeric 22 instead, even
> though I am using Python2.1?

It may run and it shouldn't hurt

> Anyway I think I should uninstall the gnuplot as well
> as gnuplot-py. Basically I should start from scratch.
> Is this recommended?

I think it's extra work, just get gnuplot installed again and
you are fine. Uninstalling from source is not trivial,
there is no universal way to do it (check for a target in
the Makefile, there probably is). That's why using rpm
(or apt/get in Debian systems) is so cool. 

> Thanks for your ongoing help.

My pleasure :-)

Take care
-- leo

Hello again Leo,

I tried typing "gnuplot" in the console, and all I get
is:
[root@localhost root]# gnuplot
bash: gnuplot: command not found
[root@localhost root]#

hence there was no gnuplot session that opened up.

The Linux distribution that I am using is Red Hat 7.1.
I assume this is what you mean by the distribution.
I have also installed Python2.1 and Numeric 18.4.1.

Should I install and use Numeric 22 instead, even
though I am using Python2.1?

Anyway I think I should uninstall the gnuplot as well
as gnuplot-py. Basically I should start from scratch.
Is this recommended?

Thanks for your ongoing help.

Regards,
Johnny


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Hi Johhny

> First of all thanks for the help, but it seems like I
> shall be needing more of it.

You'll get it :-)

> The instructions I used were
> 
> ./configure
> make
> make install
> 
> I hope this is right.

Yes, it usually is

> Anyway when i type "whereis gnuplot" I get the
> following:
> [root@localhost root]# whereis gnuplot
> gnuplot:
> [root@localhost root]#
> 
> so it obviously didn't install properly.

Unless there is some issue with whereis. How about 
typing "gnuplot" from a console ?

Does it open a "gnuplot" session ?

> What should i do? Can I uninstall in Linux?

Yes, if you use a package manager. What distribution
of Linux are you using ?. If you are new to Linux I would
strongly recommend mandrake. Anyway, chances are your
distro uses rpm, a package management software (very useful).

> Is there a step-by-step set of instructions for me to
> follow?

Yes, but please tell us what distro you use, version of 
the distro, etc.

Best
leo

Hello Leo,

First of all thanks for the help, but it seems like I
shall be needing more of it.

After reading thru the gnuplot.info website, I think
apart from installing gnuplot.py I have to install the
gnuplot program itself. So I follow the installation
instructions to install gnuplot-3.7.1. 
The instructions I used were

./configure
make
make install

I hope this is right.

Anyway when i type "whereis gnuplot" I get the
following:
[root@localhost root]# whereis gnuplot
gnuplot:
[root@localhost root]#

so it obviously didn't install properly.
What should i do? Can I uninstall in Linux?
I am fairly new to Linux, so please forgive my trivial
questions.

Is there a step-by-step set of instructions for me to
follow?

Thank you.

Regards,
Johnny

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Hi Johnny

> When i tried the method before (using
> g = Gnuplot.Gnuplot()), i get the follow error
> message:
> 
> >>> import Gnuplot
> >>> g = Gnuplot.Gnuplot()
> >>> sh: gnuplot: command not found
> 
> I have no idea what "sh" means.

I think it means the unix shell, /bin/sh

Do you have gnuplot installed ?. Is it in
your path ? What do you get if you type
"whereis gnuplot" from a shell (command line)?

It should find it. In my case it looks like

    grisell: lmilano> whereis gnuplot
    gnuplot: /usr/bin/gnuplot /usr/share/gnuplot.gih /usr/share/man/man1/gnuplot.1.bz2

> I am still unable to run demo.py

Sure, you have to solve the other problem first.

Hope this helps. Best,
-- Leo

Hello Michael,

I still have some setting up problems.
But I now am able to see Gnuplot in the sys.path.

>>> import sys
>>> print sys.path
['', '/usr/local/lib/python2.1',
'/usr/local/lib/python2.1/plat-linux2',
'/usr/local/lib/python2.1/lib-tk',
'/usr/local/lib/python2.1/lib-dynload',
'/usr/local/lib/python2.1/site-packages',
'/usr/local/lib/python2.1/site-packages/Gnuplot',
'/usr/local/lib/python2.1/site-packages/Numeric']

When i tried the method before (using
g = Gnuplot.Gnuplot()), i get the follow error
message:

>>> import Gnuplot
>>> g = Gnuplot.Gnuplot()
>>> sh: gnuplot: command not found

I have no idea what "sh" means.

I am still unable to run demo.py
sh: gnuplot: command not found
Traceback (most recent call last):
  File "demo.py", line 121, in ?
    demo()
  File "demo.py", line 40, in demo
    g.title('A simple example') # (optional)
  File
"/usr/local/lib/python2.1/site-packages/Gnuplot/_Gnuplot.py",
line 439, in title
    self.set_string('title', s)
  File
"/usr/local/lib/python2.1/site-packages/Gnuplot/_Gnuplot.py",
line 381, in set_string
    self('set %s "%s"' % (option, s))
  File
"/usr/local/lib/python2.1/site-packages/Gnuplot/_Gnuplot.py",
line 206, in __call__
    self.gnuplot(s)
  File
"/usr/local/lib/python2.1/site-packages/Gnuplot/gp_unix.py",
line 203, in __call__
    self.flush()
IOError: [Errno 32] Broken pipe

Any help would be most appreciated. Thank you.

Regards,
Johnny

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=?iso-8859-1?Q?Johnny_boi?= writes:
> My problem is that I am not able to correctly execute 'g =
> Gnuplot.Gnuplot()'
> 
> I'm not sure if the Gnuplot package needs to be present as well?

It definitely does.  Gnuplot.py just talks to the gnuplot program,
which does most of the work.

Michael

--
Michael Haggerty
hag...@jp...

Hi there,

I have read through the archives for the gnuplot, and
I found that I'm having similar problems to the
message posted on the 13th August 2002. I can't run
the demo.py or test.py.

I am able to type the 'import Gnuplot' command. My
problem is that I am not able to correctly execute
'g =3D Gnuplot.Gnuplot()'

I get this error message:

>>> import Gnuplot
>>> g =3D Gnuplot.Gnuplot()
  File "<stdin>", line 1
    g =3D Gnuplot.Gnuplot()
        ^
SyntaxError: invalid syntax

I have installed Numeric 18.4.1 and Gnuplot-py-1.6,
because I am using python2.1.

When I type 'print sys.path' after importing sys, it
give me this:
>>> print sys.path
['', '/usr/local/lib/python2.1',
'/usr/local/lib/python2.1/plat-linux2',
'/usr/local/lib/python2.1/lib-tk',
'/usr/local/lib/python2.1/lib-dynload',
'/usr/local/lib/python2.1/site-packages',
'/usr/local/lib/python2.1/site-packages/Numeric']

I'm not sure if the Gnuplot package needs to be
present as well?

Any help will be most appreciated.
Thanks

Johnny



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