gnuplot-py-users Mailing List for Gnuplot.py

Andy Schmeder wrote:

>I want to make parametric surface plots, but I can't figure out how to do
>it with Gnuplot.py.  I've seen plenty of examples done with gnuplot
>functions, but... how to provide my own data?
>
>I can do something like this: (pseudocode)
>
>u = aspan(-0.5*Pi, 0.5*Pi, 100)
>v = aspan(0, 2.0*Pi, 100)
>uv = cartesian_product(u, v)
>g('set parametric')
>g.splot(GridData(cos(uv[0])*cos(uv[1]), cos(uv[0])*sin(uv[1]), sin(uv[0]),
>type='lines'))
>
>Sure enough, it plots a sphere as expected, but its a line trace not a
>true surface, e.g. it can't hide backfaces...
>  
>

I think you are just missing g("set hidden").  The following plots a 
sphere for me with hidden-line removal:

import math
import Gnuplot, Numeric, raster
from Numeric import NewAxis

theta = raster.raster(0, math.pi, 18, 0, 19)
phi = raster.raster(0, 2.0 * math.pi, 36, 0, 37)

xyz = Numeric.zeros((len(theta), len(phi), 3,), Numeric.Float64)
xyz[:,:,0] = Numeric.sin(theta[:, NewAxis]) * Numeric.cos(phi[NewAxis, :])
xyz[:,:,1] = Numeric.sin(theta[:, NewAxis]) * Numeric.sin(phi[NewAxis, :])
xyz[:,:,2] = Numeric.cos(theta[:, NewAxis]) + (phi[NewAxis, :] * 0)

g = Gnuplot.Gnuplot()
g('set parametric')
g('set hidden')
g('set data style lines')

g.splot(xyz)

raw_input("Press return to continue")

Hope this helps,
Michael

-- 
Michael Haggerty
mh...@al...

Hi all.

I want to make parametric surface plots, but I can't figure out how to do
it with Gnuplot.py.  I've seen plenty of examples done with gnuplot
functions, but... how to provide my own data?

I can do something like this: (pseudocode)

u = aspan(-0.5*Pi, 0.5*Pi, 100)
v = aspan(0, 2.0*Pi, 100)
uv = cartesian_product(u, v)
g('set parametric')
g.splot(GridData(cos(uv[0])*cos(uv[1]), cos(uv[0])*sin(uv[1]), sin(uv[0]),
type='lines'))

Sure enough, it plots a sphere as expected, but its a line trace not a
true surface, e.g. it can't hide backfaces...

I've seen plenty of examples online using gnuplot's internal functions,
but I've got no idea how to do a parametric surface from input data...  
is this possible?

Thanks,
Andy.

---------------------------------------------------------------
 Andrew (Andy) W. Schmeder
 mailto:an...@a2...
 http://www.a2hd.com

Hi, all I had to do was edit line 38 of "gp_win32.py" in the directory
where you installed Gnuplot.py, and set the correct gnuplot_command
variable.  In order to have it work with spaces in the path, you have to
do it like the example and enclose quotes in the quotes.  I am using
winXP and Gnuplot 1.7 as well

-----Original Message-----
From: Jon Moody [mailto:jon...@mo...]=20
Sent: Thursday, February 19, 2004 2:36 PM
To: gnu...@li...
Subject: [Gnuplot-py-users] Re: 1.7 problem


I had this problem under WinXP, and the way I fixed it was to install
the pgnuplot.exe and wgnuplot.exe binaries in a location that didn't
have a space in the pathname. =20

For example, install them under C:\gnuplot\ instead of C:\Documents and
Settings\... or C:\Program Files\...

(This item would be ideal for the FAQ.txt)

--
Jonathan Moody, Ph.D
Molecular Imaging Research, Inc.



John Bollinger wrote:
=20
 >Hello,
 >
 >Thanks for Gnuplot.py!
 >
 >The following is not a problem in 1.5:
 >
 > =20
 >
 >>>>import Gnuplot
 >>>>g =3D Gnuplot.Gnuplot()
 >>>>g('test')
 >>>>       =20
 >>>>
 >Traceback (most recent call last):
 >  File "<stdin>", line 1, in ?
 >  File
 >"C:\Python23\Lib\site-packages\Gnuplot\_Gnuplot.py",
 >line 199, in __call_
 >_
 >    self.gnuplot(s)
 >  File
 >"C:\Python23\Lib\site-packages\Gnuplot\gp_win32.py",
 >line 125, in __call_
 >_
 >    self.write(s + '\n')
 >IOError: [Errno 22] Invalid argument
 > =20
 >
 >
 >Python 3.2.3
 >Numeric 23.1
 >Gnuplot.py 1.7
 >gnuplot 3.8j
 >win 2k
 > =20
 >



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I had this problem under WinXP, and the way I fixed it was to install
the pgnuplot.exe and wgnuplot.exe binaries in a location that didn't
have a space in the pathname.  

For example, install them under C:\gnuplot\ instead of C:\Documents and
Settings\... or C:\Program Files\...

(This item would be ideal for the FAQ.txt)

--
Jonathan Moody, Ph.D
Molecular Imaging Research, Inc.



John Bollinger wrote:
 
 >Hello,
 >
 >Thanks for Gnuplot.py!
 >
 >The following is not a problem in 1.5:
 >
 >  
 >
 >>>>import Gnuplot
 >>>>g = Gnuplot.Gnuplot()
 >>>>g('test')
 >>>>        
 >>>>
 >Traceback (most recent call last):
 >  File "<stdin>", line 1, in ?
 >  File
 >"C:\Python23\Lib\site-packages\Gnuplot\_Gnuplot.py",
 >line 199, in __call_
 >_
 >    self.gnuplot(s)
 >  File
 >"C:\Python23\Lib\site-packages\Gnuplot\gp_win32.py",
 >line 125, in __call_
 >_
 >    self.write(s + '\n')
 >IOError: [Errno 22] Invalid argument
 >  
 >
 >
 >Python 3.2.3
 >Numeric 23.1
 >Gnuplot.py 1.7
 >gnuplot 3.8j
 >win 2k
 >  
 >

Hello,

There is no explicit support for the "set label" command in Gnuplot.py, 
but you can easily do this using the ability to pass arbitrary commands 
to gnuplot:

    for (x,y,code) in data:
        g('set label "%s" at %g,%g' % (code, x+xoffset, y+yoffset))

where xoffset and yoffset are chosen so that the label does not 
overwrite the point itself.

Hope this helps,
Michael

Martin Peters wrote:

> I am trying to label my plots automatically through scripts -- ( very 
> large data-sets, Ex**l doesn't like it)

[...]

>         g.label(("test label") at 5,5) <---- How do you automate this 
> line?

[...]

> DATA:
> |  x  |    y     |  code |
> |--------------|--------|
> |  1  |  0.50 |  A12  |
> |  2  |  0.75 |  ZXC  |
> |  3  |  0.45 |  GFS  |
> |  4  |  0.23 |  AER  |
> |  5  |  0.12 |  ASD  |
> |  6  |  0.90 |  IOP   |
> |-----------------------|
> How do you make a graph, and label each of the 6 points with the, x 
> and y value, or by its code?



-- 
Michael Haggerty
mh...@al...

Hi John,
I'm also just beginning with gnuplot.py. But enclosed you'll find a script
that plots an ohlcv financebar plot that works just fine. I managed to also
plot the dates on the x-axis.
w. k. regards, Joost Janse


----- Original Message ----- 
From: "John Bollinger" <bb...@ya...>
To: <gnu...@li...>
Sent: Tuesday, February 17, 2004 5:35 PM
Subject: [Gnuplot-py-users] gnuplot.py and stocks


> Hello plotters,
>
> I am very familiar with gnuplot, but just learning
> gnuplot.py. Does anyone have any experience with
> plotting stocks with financebars, candlesticks, etc?
> An example script perhaps?
>
> Thanks in advance,
>
>      --jab
>
> =====
> John Bollinger, CFA, CMT
> www.BollingerBands.com
>
> If you advance far enough, you arrive at the beginning.
>
> __________________________________
> Do you Yahoo!?
> Yahoo! Finance: Get your refund fast by filing online.
> http://taxes.yahoo.com/filing.html
>
>
> -------------------------------------------------------
> SF.Net is sponsored by: Speed Start Your Linux Apps Now.
> Build and deploy apps & Web services for Linux with
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> http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click
> _______________________________________________
> Gnuplot-py-users mailing list
> Gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-py-users
>

Hello plotters,

I am very familiar with gnuplot, but just learning
gnuplot.py. Does anyone have any experience with
plotting stocks with financebars, candlesticks, etc?
An example script perhaps?

Thanks in advance,

     --jab

=====
John Bollinger, CFA, CMT
www.BollingerBands.com

If you advance far enough, you arrive at the beginning.

__________________________________
Do you Yahoo!?
Yahoo! Finance: Get your refund fast by filing online.
http://taxes.yahoo.com/filing.html

Hi,

I am trying to label my plots automatically through scripts -- ( very 
large data-sets, Ex**l doesn't like it)

y= []
steps = range(len(y))
         d = Gnuplot.Data(steps,y)
         g = Gnuplot.Gnuplot()
         g.title("Title")
         g.xlabel("X-label")
         g.ylabel("Y-label")
         g.label(("test label") at 5,5) <---- How do you automate this 
line?
         g('set data style linespoints')
         g.plot(d)
         g.hardcopy('output.ps', enhanced=1, color=1)


DATA:
|  x  |    y     |  code |
|--------------|--------|
|  1  |  0.50 |  A12  |
|  2  |  0.75 |  ZXC  |
|  3  |  0.45 |  GFS  |
|  4  |  0.23 |  AER  |
|  5  |  0.12 |  ASD  |
|  6  |  0.90 |  IOP   |
|-----------------------|
How do you make a graph, and label each of the 6 points with the, x and 
y value, or by its code?

your help is much appreciated,

cheers,

Martin.

Hi All

> pyfits and PyRAF use numarray instead of Numeric, so I have used  
> Gnuplot.py with numarray.array inputs for more than half a year. 
> Everything seems to work fine. I think numarray tries to be 
> backward compatible with Numeric.

Yes, and moreover, there is a list of differences between the two here:
http://www.stsci.edu/resources/software_hardware/numarray/userguide

It seems like the differences should not affect Gnuplot.py,
but this is a question for Michael perhaps.

Howabout a condicional import in the relevant modules? (funcutils, etc)
Something like:

####
try:
    import Numarray as numeric_lib
except:
    import Numeric as numeric_lib
####

And then all internal references are made to "numeric_lib",
for instance 

return numeric_lib.asarray(m, Numeric.Float32)

I think it is fare to assume that the user will prefer Numarray
if installed, and I also think that Numeric will be around
for a loooong time. Sounds reasonable ? 

Best
Leo

On Sat, 31 Jan 2004, Michael Haggerty wrote:

>
>If Gnuplot.py would require changes to use numarray, then the most 
>important question is when to make the transition.  It's unlikely that 
>the whole Python community will switch from one library to the other on 
>the same day!
>

pyfits and PyRAF use numarray instead of Numeric, so I have used  
Gnuplot.py with numarray.array inputs for more than half a year. 
Everything seems to work fine. I think numarray tries to be 
backward compatible with Numeric.

regards,

   Juho Schultz

   e-mail: juh...@as...
   www.astro.helsinki.fi/~jschultz
   Observatory
   P.O. Box 14
   FIN-00014 University of Helsinki
   FINLAND