gnuplot-py-users — A mailing list for the users of Gnuplot.py.

Re: [Gnuplot-py-users] save plot into stream, possible?

[Michael H. <mh...@al...>]

Juana Arco wrote:
> I'm trying to save a plot into a stream and call it from a webpage, I
> cannot find a way to do it.

I don't understand what you want.  Would you like the gnuplot commands
to be written to a stream, or do you want the gnuplot output (i.e.,
image files) stored to a stream?  The answer might also depend on what
operating system you are using...

Michael

[Gnuplot-py-users] save plot into stream, possible?

[Juana A. <lua...@ho...>]

Hi,

I'm trying to save a plot into a stream and call it from a webpage, I cannot find a way to do it.

Thanks,

Lua



_________________________________________________________________
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http://www.microsoft.com/windows/choosepc/?ocid=ftp_val_wl_290

[Gnuplot-py-users] Setting values on x and y axis

[Elias T. <el...@ne...>]

Hello,
I want to change the values on x and y axis to appear in a non-symmetric 
way, e.g. within a range between 0 and 50000 I want to show the 
following values: 50, 100, 500, 1000, 5000, 10000, 25000. By default the 
split will be in chunks of 5000, so am missing all the details of the 
curve between 0 and 5000.

thanks,
elias

[Gnuplot-py-users] Setting values on x and y axis

[Elias T. <el...@ne...>]

Hello,
I want to change the values on x and y axis to appear in a non-symmetric 
way, e.g. within a range between 0 and 50000 I want to show the 
following values: 50, 100, 500, 1000, 5000, 10000, 25000. By default the 
split will be in chunks of 5000, so am missing all the details of the 
curve between 0 and 5000.

thanks,
elias

[Gnuplot-py-users] Setting values on x and y axis

[Elias T. <eth...@st...>]

Hello,
I want to change the values on x and y axis to appear in a non-symmetric 
way, e.g. within a range between 0 and 50000 I want to show the 
following values: 50, 100, 500, 1000, 5000, 10000, 25000. By default the 
split will be in chunks of 5000, so am missing all the details of the 
curve between 0 and 5000.

thanks,
elias

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Scotland, with registration number SC005336.

Re: [Gnuplot-py-users] Plotting surfaces

[Benny M. <ben...@gm...>]

2009/6/7 Fernando Cladera <el....@gm...>:
> There was a bad indented line (t0 =  tinicial)... Sorry!
> This is the code. I could add the plotting, but i couldn't draw the
> surface.

Look at the examples in the demo.py file

Benny

>
> def funhomo(x,t):
>  return
> eigenvector[0,0]*cos(wfrec*t)*sin(pi*x/(2*L))+eigenvector[1,0]*cos(wfrec*t)*sin(3*pi*x/(2*L))+eigenvector[2,0]*cos(wfrec*t)*sin(5*pi*x/(2*L))
>
> it=int(raw_input("ingrese numero de puntos a obtener: "))
> xinicial=0
> tinicial=0
> hx=float(raw_input("ingrese paso de x: "))
> ht=float(raw_input("ingrese paso de t: "))
>
> funclst=[]
> x0 = xinicial
> t0 = tinicial
> for i in range(0,it+1):
>        x=x0
>        for j in range(0,it+1):
>                t=t0
>                f=funhomo(x,t)
>                t0=t+ht
>                print x,t,f
>                funclst.append([x,t,f])
>        t0 =  tinicial
>        x0=x+hx
> #print funclst
>
> gp = Gnuplot.Gnuplot(debug=1)
> gp.clear()
> plot1 = Gnuplot.PlotItems.Data(funclst, with_="points",
> title="Superficie")
> gp.splot(plot1)
>
> --
> Fernando Cladera <el....@gm...>
>
>
> ------------------------------------------------------------------------------
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>

Re: [Gnuplot-py-users] Plotting surfaces

[Alan G I. <ai...@am...>]

On 6/6/2009 11:55 PM Fernando Cladera apparently wrote:
> [[0, 0, 0.0], [0, 0, 0.0], [0, 0, 0.0], [1.0, 0,
> 3.1415924394448096e-05], [1.0, 0, 3.1415924394448096e-05], [1.0, 0,
> 3.1415924394448096e-05], [2.0, 0, 6.2831848757889894e-05], [2.0, 0,
> 6.2831848757889894e-05], [2.0, 0, 6.2831848757889894e-05]]

> I got a line draw and this
> Warning: empty y range [0:0], adjusting to [-1:1].


Which is a remarkably specific and accurate warning.
Look at the second element in each data point.

Cheers,
Alan Isaac

[Gnuplot-py-users] Plotting surfaces

[Fernando C. <el....@gm...>]

There was a bad indented line (t0 =  tinicial)... Sorry!
This is the code. I could add the plotting, but i couldn't draw the
surface.

def funhomo(x,t):
  return
eigenvector[0,0]*cos(wfrec*t)*sin(pi*x/(2*L))+eigenvector[1,0]*cos(wfrec*t)*sin(3*pi*x/(2*L))+eigenvector[2,0]*cos(wfrec*t)*sin(5*pi*x/(2*L))

it=int(raw_input("ingrese numero de puntos a obtener: "))
xinicial=0
tinicial=0
hx=float(raw_input("ingrese paso de x: "))
ht=float(raw_input("ingrese paso de t: "))

funclst=[]
x0 = xinicial
t0 = tinicial
for i in range(0,it+1):
	x=x0
	for j in range(0,it+1):
		t=t0
		f=funhomo(x,t)
		t0=t+ht
		print x,t,f
		funclst.append([x,t,f])
	t0 =  tinicial	
	x0=x+hx
#print funclst

gp = Gnuplot.Gnuplot(debug=1)
gp.clear()
plot1 = Gnuplot.PlotItems.Data(funclst, with_="points",
title="Superficie")
gp.splot(plot1)

-- 
Fernando Cladera <el....@gm...>

[Gnuplot-py-users] Plotting surfaces

[Fernando C. <el....@gm...>]

Hi everybody!
I'm new with gnuplot.py... I'll try not to ask a newbie question...
I'm now working on an engineering problem of differential equations. I
use numpy and I have to plot a surface, that is the solution of the
problem. A piece of code of the project:

def funhomo(x,t):
  return
eigenvector[0,0]*cos(wfrec*t)*sin(pi*x/(2*L))+eigenvector[1,0]*cos(wfrec*t)*sin(3*pi*x/(2*L))+eigenvector[2,0]*cos(wfrec*t)*sin(5*pi*x/(2*L))

it=int(raw_input("ingrese numero de puntos a obtener: "))
xinicial=0
tinicial=0
hx=float(raw_input("ingrese paso de x: "))
ht=float(raw_input("ingrese paso de t: "))

funclst=[]
x0 = xinicial
t0 = tinicial
for i in range(0,it+1):
	x=x0
	for j in range(0,it+1):
		t=t0
		f=funhomo(x,t)
		t0=t+ht
		#print x,t,f
		funclst.append([x,t,f])
		t0 = tinicial	
	x0=x+hx
print funclst

As you can see, this piece makes a arrange (funclst) with a list of
points (t and x) and the function (funhomo) evaluated in those points.
Here, you can see an output, for it=2 and hx=ht=1
[[0, 0, 0.0], [0, 0, 0.0], [0, 0, 0.0], [1.0, 0,
3.1415924394448096e-05], [1.0, 0, 3.1415924394448096e-05], [1.0, 0,
3.1415924394448096e-05], [2.0, 0, 6.2831848757889894e-05], [2.0, 0,
6.2831848757889894e-05], [2.0, 0, 6.2831848757889894e-05]]
The first element of each vector is the x. The second, the t (or y in a
plot) and the third is the z=funhomo(x,t).

I've tried to plot those points with gnuplot.py, but i can't!
If i use 

gp = Gnuplot.Gnuplot(debug=1)
gp.clear()
gp('set data style lines')
gp.splot(funclst)

I got a line draw and this
Warning: empty y range [0:0], adjusting to [-1:1].

However, i tried to export a "point list" and plot them with gnuplot.
But i got a plot of the points, and i don't know how to draw the surface
(the mesh between points). Any idea? 

Thanks! 




-- 
Fernando Cladera <el....@gm...>

Re: [Gnuplot-py-users] demo.py produces IOError on Win XP

[Alan G I. <ai...@am...>]

 > On 5/22/2009 9:13 AM mohsen rahmanian apparently wrote:
 >> When I use gnuplot-py on windows xp with python 2.5.1 and run demo.py I get this:
 >> IOError: [Errno 22] Invalid argument



On 5/22/2009 5:34 PM Brian Connell apparently wrote:
 > I saw this problem when a long sequence of gnuplot commands was being passed into another function as a parameter. 
The IOError was complaining that the parameter was not valid for some reason.



Well, out of curiosity, I started from scratch on Win XP:

- download Gnuplot.py version 1.8 from sourceforce
- install under Python 2.5.4 (setup.py install)
- change gp_win32.py to point to my copy of pgnuplot.exe
   (note the name!)
- run demo.py


No problems at all.


Cheers,
Alan Isaac

Re: [Gnuplot-py-users] demo.py produces IOError on Win XP

[Alan G I. <ai...@am...>]

On 5/22/2009 9:13 AM mohsen rahmanian apparently wrote:
> When I use gnuplot-py on windows xp with python 2.5.1 and run demo.py
> I get this:
> IOError: [Errno 22] Invalid argument


Brian Connell recently ran into this.
Hopefully he will post his solution.
Alan Isaac

[Gnuplot-py-users] (no subject)

[mohsen r. <rah...@gm...>]

His name

Dear users,

When I use gnuplot-py on windows xp with python 2.5.1 and run demo.py
I get this:

gnuplot> set terminal windows
gnuplot> set title "A simple example"
gnuplot> set data style linespoints
gnuplot> plot
"c:\\docume~1\\ef634~1.pas\\locals~1\\temp\\tmpm5ee2g.gnuplot" notitle
Please press return to continue...

Traceback (most recent call last):
File "C:\Program Files\Paive-1.0\Lib\site-packages\Gnuplot\demo.py",
line 110, in <module>
demo()
File "C:\Program Files\Paive-1.0\Lib\site-packages\Gnuplot\demo.py",
line 36, in demo
g.reset()
File "C:\Program
Files\Paive-1.0\lib\site-packages\Gnuplot\_Gnuplot.py", line 366, in reset
self('reset')
File "C:\Program
Files\Paive-1.0\lib\site-packages\Gnuplot\_Gnuplot.py", line 210, in
__call__
self.gnuplot(s)
File "C:\Program
Files\Paive-1.0\lib\site-packages\Gnuplot\gp_win32.py", line 130, in
__call__
self.write(s + '\n')
IOError: [Errno 22] Invalid argument

what is my problem?

Thanks a lot
-- 
Best Regards
Rahmanian

Re: [Gnuplot-py-users] 'import Gnuplot' statement is not working on WinXP

[Alan G I. <ai...@am...>]

On 5/20/2009 6:26 PM Brian Connell apparently wrote:
> the persist option is not supported on Windoze. 

Aha.

> I have printed out the script variable passed in, but my 
> untrained eye can not see a problem. 

Put it in a file and load it in gnuplot itself to see how
gnuplot responds.

I'm afraid I'm not currently using Gnuplot.py, so I cannot
be much more help.

Cheers,
Alan Isaac

Re: [Gnuplot-py-users] 'import Gnuplot' statement is not working on WinXP

[Alan G I. <ai...@am...>]

You should not need any of your path tweaks.
It looks like Gnuplot imports fine.

Start up an interactive interpreter.
At the interpreter prompt, enter:
     import Gnuplot
What happens?

Cheers,
Alan Isaac

[Gnuplot-py-users] 'import Gnuplot' statement is not working on WinXP

[Brian C. <bdc...@ya...>]

Been trying awhile, read as much as 
I can (all FAQs, README’s, etc), and need help. Basically I cannot get the 
‘import Gnuplot” statement to work in a python script. Details as 
follows.
 
Working in Windows XP 
professional.
Installed gnuplot.py 1.8, by 
unzipping to a directory, and from that directory 
running:
     python setup.py 
install
When running the setup, got a 
warning about “licence” being deprecated in favor of “license”; but everything 
seems to have installed/copied OK.
Have the following directory in 
place now (with the proper capital “G” which was a problem for 
some):
     C:\Program 
Files\Python26\Lib\site-packages\Gnuplot
Editted the gp_win32.py file to 
point to where pgnuplot.exe is located on my 
PC.
Ran all the demo scripts, and got 
all the demo graphs properly. Assuming gnuplot and numpy installed 
correctly.
Added the sitepackages directory to 
my PATH.
 
My problem is that when I run a 
python script that tries to “import Gnuplot” it gets an error. For instance my 
gpxplot.py script prints out this after trying to import 
Gnuplot.
 
gnuplot.py is not 
found
Exception AttributeError: 
"GnuplotProcess instance has no attribute 'gnuplot'" in <bound method 
GnuplotProcess.__del__ of <Gnuplot.gp_win32.GnuplotProcess instance at 
0x0127C170>> i
Exception AttributeError: "Gnuplot 
instance has no attribute 'gnuplot'" in <bound method Gnuplot.__del__ of 
<Gnuplot._Gnuplot.Gnuplot instance at 0x0127C148>> 
ignored
 
Did some additional reading about 
python installs, and found that often a *.pth file is required to specify the 
path to the directory which contains the module, so following the conventions of 
some other packages I have installed, I created a Gnuplot.pth file in the 
site-packages directory with a single line as follows (since the paths seem to 
be relative to the directory the .pth file is 
in):
     
Gnupath
 
Still no luck. The “import Gnuplot” 
still fails.
 
Anyone got any ideas? Even if it is 
next steps for debug, which I suspect needs to be around the area of how python 
locates modules in files on disk (I am not a Python expert) 
…
 
Here is the gpxplot.py script, the 
failing import is in the plot_in_gnuplot 
function.
  http://gpxplot.googlecode.com/svn/trunk/gpxplot.py

Any help 
appreciated.
 
 … 
Brian

Re: [Gnuplot-py-users] gnuplot.py and "plot ... with image"

[Wonseok S. <ws...@st...>]

I have figured out how to generate data that can be fed to Gnuplot by  
myself.  It should be an array of [row, col, val].
So, here is what I did:

import Gnuplot
from numpy import *

g = Gnuplot.Gnuplot(persist=True)
C = zeros((11,11), 'f')
C[5,5] = 1.0

nrow, ncol = C.shape
dg = [[i,j,C[i,j]] for i in range(nrow) for j in range(ncol)]  # data  
for gnuplot
d = Gnuplot.Data(e, with_='image')

g.plot(d)

On Apr 29, 2009, at 15:09 , Wonseok Shin wrote:

> So I have:
> >> from numpy import zeros
> >> C = zeros((11,11),'f')
> >> C[5,5] = 1.0
>
> Then how can I plot this array with "plot ... with image"?
> What is the way to convert C into a type of data that can be fed  
> into the gnuplot command "plot ... with image"?
>
> - Wonseok
>
>
> On Apr 29, 2009, at 0:37 , Benny Malengier wrote:
>
>>
>>
>> 2009/4/29 Wonseok Shin <ws...@st...>
>> Hello,
>>
>> Is there some way to use a gnuplot command "plot ... with image"?
>> This is a relatively new feature in gnuplot version 4.2 to draw a 2D
>> image, and probably by that reason I cannot easily find a good  
>> example
>> of its usage in gnuplot.py.
>>
>> Specifically, I want to to draw 2D NumPy array C[i, j] with "plot ...
>> with image".
>>
>> Newer commands are not directly available in gnuplot.py, but you  
>> can send normal gnuplot commands to do everything gnuplot can handle.
>>
>> Benny
>>
>
> ------------------------------------------------------------------------------
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Re: [Gnuplot-py-users] gnuplot.py and "plot ... with image"

[Wonseok S. <ws...@st...>]

So I have:
 >> from numpy import zeros
 >> C = zeros((11,11),'f')
 >> C[5,5] = 1.0

Then how can I plot this array with "plot ... with image"?
What is the way to convert C into a type of data that can be fed into  
the gnuplot command "plot ... with image"?

- Wonseok


On Apr 29, 2009, at 0:37 , Benny Malengier wrote:

>
>
> 2009/4/29 Wonseok Shin <ws...@st...>
> Hello,
>
> Is there some way to use a gnuplot command "plot ... with image"?
> This is a relatively new feature in gnuplot version 4.2 to draw a 2D
> image, and probably by that reason I cannot easily find a good example
> of its usage in gnuplot.py.
>
> Specifically, I want to to draw 2D NumPy array C[i, j] with "plot ...
> with image".
>
> Newer commands are not directly available in gnuplot.py, but you can  
> send normal gnuplot commands to do everything gnuplot can handle.
>
> Benny
>

Re: [Gnuplot-py-users] gnuplot.py and "plot ... with image"

[Benny M. <ben...@gm...>]

2009/4/29 Wonseok Shin <ws...@st...>

> Hello,
>
> Is there some way to use a gnuplot command "plot ... with image"?
> This is a relatively new feature in gnuplot version 4.2 to draw a 2D
> image, and probably by that reason I cannot easily find a good example
> of its usage in gnuplot.py.
>
> Specifically, I want to to draw 2D NumPy array C[i, j] with "plot ...
> with image".
>

Newer commands are not directly available in gnuplot.py, but you can send
normal gnuplot commands to do everything gnuplot can handle.

Benny

[Gnuplot-py-users] gnuplot.py and "plot ... with image"

[Wonseok S. <ws...@st...>]

Hello,

Is there some way to use a gnuplot command "plot ... with image"?
This is a relatively new feature in gnuplot version 4.2 to draw a 2D  
image, and probably by that reason I cannot easily find a good example  
of its usage in gnuplot.py.

Specifically, I want to to draw 2D NumPy array C[i, j] with "plot ...  
with image".

- Wonseok Shin

[Gnuplot-py-users] Waiting for gnuplot to finish plotting ?

[Rémi C. <Rem...@fr...>]

Hi,

I am trying to make an animated plot with gnuplot controlled from a 
python program. The problem is I did not find a command to sync with 
gnuplot. More precisely my program looks like this:

while True:
    write data to 'file.dat'
    plot 'file.dat' with gnuplot
    wait a little

the problem is in 'wait a little'. Sometimes, gnuplot is too slow, and 
does not plot 'file.dat' fast enough. So the file may be destroyed 
before it is plotted. What I would need is a command that would wait for 
gnuplot to finish plotting. Is there such a command ? I could not find it.

It should be easy to implement. Just send 'echo "sync"' to gnuplot, and 
wait for a line with "sync" in return.

I will probably implement this myself.

I found some interesting ideas there:
http://www.physik.tu-dresden.de/~baecker/python/gnuplot.html
Maintainers of gnuplot-py may wish to implement these functions. It 
seems very convenient, and easy to implement.

Rémi

[Gnuplot-py-users] Gnuplot-py on Windows XP

[Edoardo P. <e....@nk...>]

Dear users,

I'd like to use gnuplot-py on windowsxp. I have python 2.6. Apparently I 
managed to take the setup.py install to the end. As a matter of facts
import Gnuplot doesn't return errors.

Anyway when I try the demo.py I get this:

gnuplot> set terminal windows
gnuplot> set title "A simple example"
gnuplot> set data style linespoints
gnuplot> plot 
"c:\\docume~1\\ef634~1.pas\\locals~1\\temp\\tmpm5ee2g.gnuplot" notitle
Please press return to continue...

Traceback (most recent call last):
   File "C:\Program Files\Paive-1.0\Lib\site-packages\Gnuplot\demo.py", 
line 110, in <module>
     demo()
   File "C:\Program Files\Paive-1.0\Lib\site-packages\Gnuplot\demo.py", 
line 36, in demo
     g.reset()
   File "C:\Program 
Files\Paive-1.0\lib\site-packages\Gnuplot\_Gnuplot.py", line 366, in reset
     self('reset')
   File "C:\Program 
Files\Paive-1.0\lib\site-packages\Gnuplot\_Gnuplot.py", line 210, in 
__call__
     self.gnuplot(s)
   File "C:\Program 
Files\Paive-1.0\lib\site-packages\Gnuplot\gp_win32.py", line 130, in 
__call__
     self.write(s + '\n')
IOError: [Errno 22] Invalid argument


I have tried to check the proper file names in the gp_win32.py and 
updated to the location of pgnuplot.exe but there was no apparent 
difference: it always failed. I presume that the error is indicating 
something different but I cannot figure out what.

I gave a look at the mailing list archives before writing this email.

Thanks

Edoardo


-- 
Edoardo Pasca, Ph.D
Nederlands Kanker Instituut -- Antoni van Leeuwenhoek Ziekenhuis
Radiotherapy Department
Plesmanlaan 121
1066 CX Amsterdam
tel: 0031 (0)20 512 1759

Re: [Gnuplot-py-users] Gnuplot.py float precision (again)

[Xaver W. <xav...@we...>]

Hi,
basically, I agree, we probably don't need to raise an exception. However,

 isinstance(m, numpy.ndarray)

returns 'True' for any valid numpy array, which includes e. g. string arrays, 
and for a non-gnuplot compatible array the error message with your code is

gnuplot> plot "/tmp/tmpndt27x.gnuplot/fifo" notitle
              ^
         line 0: Bad data on line 1

..not very helpful. I'd propose to rather have explicitly permitted array 
types, like

     if m.dtype.name in ('float64','float32','int32',int64'):
         return m
     else:
         return numpy.array(m,dtype=numpy.float32)

whereas the 'else' clause serves mainly for having a defined error message, 
maybe intercepted by a 'try...except'.

This might also eliminate the redundant conversion from float32 to float32 (if 
python/numpy is not intelligent enough to not do that). What about int32 / 
int64 arrays? It would be just fine to not convert them as well, right? Saves 
memory, I guess...

Xaver

P.S.:
Is
diff --context oldfile.py oldfile_new.py >> mypatch.py.patch
the right way to make a patch file for the tracker? I've never done that 
before...


Am Dienstag, 3. März 2009 14:40:51 schrieb Alan G Isaac:
> You are correct: the try clause now succeeds
>
> because downcasting is allowed:
>      >>> x = np.random.random((5,))
>      >>> x.dtype
>
>      dtype('float64')
>
>      >>> x32 = x.astype(np.float32)
>      >>> x32.dtype
>
>      dtype('float32')
>
> How about returning any ndarray untouched?
>
>      if isinstance(m, numpy.ndarray):
>          return m
>      else:
>          return numpy.array(m,dtype=numpy.float32)
>
> I see no need to print an error message:
> NumPy will report appropriately.
>
> Alan Isaac
>
>
>
> ---------------------------------------------------------------------------
>--- Open Source Business Conference (OSBC), March 24-25, 2009, San
> Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing
> the Enterprise -Strategies to boost innovation and cut costs with open
> source participation -Receive a $600 discount off the registration fee with
> the source code: SFAD http://p.sf.net/sfu/XcvMzF8H
> _______________________________________________
> Gnuplot-py-users mailing list
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Re: [Gnuplot-py-users] Gnuplot.py float precision (again)

[Alan G I. <ai...@am...>]

You are correct: the try clause now succeeds
because downcasting is allowed:

     >>> x = np.random.random((5,))
     >>> x.dtype
     dtype('float64')
     >>> x32 = x.astype(np.float32)
     >>> x32.dtype
     dtype('float32')

How about returning any ndarray untouched?

     if isinstance(m, numpy.ndarray):
         return m
     else:
         return numpy.array(m,dtype=numpy.float32)

I see no need to print an error message:
NumPy will report appropriately.

Alan Isaac

[Gnuplot-py-users] Gnuplot with MacPython 2.5

[Lois <loi...@gm...>]

I've been trying to make Gnuplot-py to work with MacPython 2.5 (I have
VPython installed) and haven't had much success.I'm a new PC convert, I've
learnt a few basics things in Terminal, like changing directories. I'll be
very grateful if someone guides me through this.
These are the files I downloaded (from Sourceforge.net)

gnuplot-4.3.0-2008-11-21.tar

gnuplot-py-1.8.tar

numpy-1.2.1-py2.5-macosx10.5.dmg

AquaTerm1.0.1.dmg


Thanks,

Lois

Re: [Gnuplot-py-users] Gnuplot.py float precision (again)

[Benny M. <ben...@gm...>]

I suggest you look up things in numpy doc. If nothing there, use the python
way of determining things:

if m:
   if isinstance(m[0], numpy.float64):
        raise TypeError

Provide a patch to gnuplot when you make it work.

Benny

2009/3/3 Michael Haggerty <mh...@al...>

> Xaver Wurzenberger wrote:
> > Hi guys,
> >
> > I'm sorry to bring this up again, but I'm about to publish my code and
> I'd
> > really love to get this straight/fixed. In case you don't remember, I'm
> > trying to plot high precision numbers (float64, that is), but gnuplot.py
> > converts them to float32 arrays.
> > Michael Haggerty told me to 'workaround' by using numpy double arrays,
> but it
> > seems that's not working here. I think the problem might be here:
> > (/usr/share/pyshared/Gnuplot/utils.py, line 20ff)
> >
> >> def float_array(m):
> >>    """Return the argument as a numpy array of type at least 'Float32'.
> >>
> >>    Leave 'Float64' unchanged, but upcast all other types to
> >>    'Float32'.  Allow also for the possibility that the argument is a
> >>    python native type that can be converted to a numpy array using
> >>    'numpy.asarray()', but in that case don't worry about
> >>    downcasting to single-precision float.
> >>
> >>    """
> >>
> >>    try:
> >>        # Try Float32 (this will refuse to downcast)
> >>        return numpy.asarray(m, numpy.float32)
> >>    except TypeError:
> >>        # That failure might have been because the input array was
> >>        # of a wider data type than float32; try to convert to the
> >>        # largest floating-point type available:
> >>        # NOTE TBD: I'm not sure float_ is the best data-type for this...
> >>        try:
> >>            return numpy.asarray(m, numpy.float_)
> >>        except TypeError:
> >>            # TBD: Need better handling of this error!
> >>            print "Fatal: array dimensions not equal!"
> >>            return None
> >
> > If I understand this correctly, the line
> >> return numpy.asarray(m, numpy.float32)
> > is supposed to raise a TypeError if you give a numpy.float64 array.
> > However, my python shell doesn't:
> >
> >> (00:13:52)xaver@siduxbox:~$python
> >> Python 2.5.4 (r254:67916, Feb 18 2009, 03:00:47)
> >> [GCC 4.3.3] on linux2
> >> Type "help", "copyright", "credits" or "license" for more information.
> >>>>> import numpy
> >>>>> a = numpy.array( [2.000000001,3.0,4.0] )
> >>>>> a.dtype
> >> dtype('float64')
> >>>>> numpy.asarray(a, numpy.float32)
> >> array([ 2.,  3.,  4.], dtype=float32)
> >
> > Am I doing sth wrong? Can anyone confirm that?
>
> I don't see that you are doing anything wrong.  That array-conversion
> code was written long ago, originally for Numeric (not numpy).
> Apparently numpy behaves differently than Numeric in this situation,
> resulting in a Gnuplot.py bug.
>
> I suggest that you try to find the right incantation for Gnuplot.py to
> do this conversion without losing precision, and submit a patch to
> Gnuplot.py.
>
> Michael
>
>
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