matplotlib-users Mailing List for matplotlib (Page 2)

On 18. aug. 2010, at 23.21, Friedrich Romstedt wrote:

> 2010/8/17 Paul Anton Letnes <pau...@gm...>:
>> If I try to use LaTeX for text processing (i.e. text.usetex : True in my matplotlibrc), I get a cryptic LaTeX error which didn't use to be there before. I get the same problem when using matplotlib-0.98.5 which I compiled from source, and matplotlib-1.0.0 from macports. My python version is 2.6.5 (from macports) and I am running Mac OS X 10.6.4.
>> 
>> The error messages are pretty much the same no matter what I plot, and everything works fine if text.usetex : False.
> 
> Can't reproduce the error here on Mac OS X 10.6.4 64bit with
> framework-compiled Python 2.6.5 and matplotlib from svn.  I could
> imaging you are missing file creation rights or similar in the
> directory where matplotlib wants to place that foobar123345.tex file.
> 
> Friedrich

It seems that I had changed an environment variable (TEXINPUTS) elsewhere, meaning that latex didn't pick up the right source file. Everything seems fine now!

Paul

Hi

I have one very nagging issue which I would like to solve with matplotlib once 
and for all: this may have to do with my desktop windown manager but I couldn't 
find much there, so any input is welcome.

When I open a new figure, the figure ALWAYS comes BELOW my current xterm (using 
KDE 4.3) and ALWAYS in the wrong place (top left corner where I usually put 
other windows). I would like some "smart" location for that figure so I don't 
have systematically to get it up and move it when I open a new figure. Is this 
linked to matplotlib? (this is the only application which is not managed 
properly in this context). I am using ipython -pylab as a working context (on 
opensuse 11.2).

thanks and cheers

Eric

Aha!  I knew it must be that simple, I just yet hadn't hit on step.

Thanks,
Ethan

On 08/19/2010 09:14 PM, Ryan May wrote:
> On Thu, Aug 19, 2010 at 5:03 PM, Ethan Swint<es...@vt...>  wrote:
>    
>> Hi-
>>
>> I'm trying to plot an XY line graph with discrete XY pairs in it with a
>> step response between each pair.  In other words, on the range [X1,X2),
>> it should have a horizontal line at Y1, at X2, the line goes vertical
>> from Y1 to Y2, then on the range [X2,X3), it should have a horizontal
>> line at Y2.  I haven't seen any examples yet, and my forays into the
>> documentation haven't yielded up a simple way to do this.  Is there a
>> simple option to do this, or do I have to pad my data with X1,
>> X2-epsilon, X2, X3-epsilon, etc.
>>      
> What you're looking for is the step() plotting function:
>
>        step(x, y, *args, **kwargs)
>
>      Make a step plot. Additional keyword args to :func:`step` are the same
>      as those for :func:`~matplotlib.pyplot.plot`.
>
>      *x* and *y* must be 1-D sequences, and it is assumed, but not checked,
>      that *x* is uniformly increasing.
>
>      Keyword arguments:
>
>      *where*: [ 'pre' | 'post' | 'mid'  ]
>        If 'pre', the interval from x[i] to x[i+1] has level y[i+1]
>
>        If 'post', that interval has level y[i]
>
>        If 'mid', the jumps in *y* occur half-way between the
>        *x*-values.
>
> Ryan
>
>    

On Thu, Aug 19, 2010 at 5:03 PM, Ethan Swint <es...@vt...> wrote:
> Hi-
>
> I'm trying to plot an XY line graph with discrete XY pairs in it with a
> step response between each pair.  In other words, on the range [X1,X2),
> it should have a horizontal line at Y1, at X2, the line goes vertical
> from Y1 to Y2, then on the range [X2,X3), it should have a horizontal
> line at Y2.  I haven't seen any examples yet, and my forays into the
> documentation haven't yielded up a simple way to do this.  Is there a
> simple option to do this, or do I have to pad my data with X1,
> X2-epsilon, X2, X3-epsilon, etc.

What you're looking for is the step() plotting function:

      step(x, y, *args, **kwargs)

    Make a step plot. Additional keyword args to :func:`step` are the same
    as those for :func:`~matplotlib.pyplot.plot`.

    *x* and *y* must be 1-D sequences, and it is assumed, but not checked,
    that *x* is uniformly increasing.

    Keyword arguments:

    *where*: [ 'pre' | 'post' | 'mid'  ]
      If 'pre', the interval from x[i] to x[i+1] has level y[i+1]

      If 'post', that interval has level y[i]

      If 'mid', the jumps in *y* occur half-way between the
      *x*-values.

Ryan

-- 
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma

Hi-

I'm trying to plot an XY line graph with discrete XY pairs in it with a 
step response between each pair.  In other words, on the range [X1,X2), 
it should have a horizontal line at Y1, at X2, the line goes vertical 
from Y1 to Y2, then on the range [X2,X3), it should have a horizontal 
line at Y2.  I haven't seen any examples yet, and my forays into the 
documentation haven't yielded up a simple way to do this.  Is there a 
simple option to do this, or do I have to pad my data with X1, 
X2-epsilon, X2, X3-epsilon, etc.

Thanks,
Ethan

On 08/19/2010 01:20 PM, Benjamin Root wrote:
> On Thu, Aug 19, 2010 at 5:05 PM, Bala subramanian
> <bal...@gm... <mailto:bal...@gm...>> wrote:
>
>     Friends,
>
>     I would like to place grid lines (precisely draw lines) at specific
>     (x,y) coordinates.  If i am not wrong, grid() function will take
>     only True/False arguments. Someone kindly write me if there is any
>     way to do this.

Are you perhaps looking for the axvline and axhline pyplot functions and 
corresponding Axes methods?

Eric

>
>     Thanks,
>     Bala
>
>
> Perhaps the Major/Minor Locators would be of use to you?
>
> http://matplotlib.sourceforge.net/api/ticker_api.html
> http://matplotlib.sourceforge.net/examples/pylab_examples/major_minor_demo1.html
>
> When turning on the grid, you can control whether you turn on the minor
> or major lines by specifying the 'which' keyword.  Use major lines if
> you want tick labels for them, use minor lines if you don't.
>
> I hope this helps,
> Ben Root
>
>
>
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> I have been unable to build/install Matplotlib 1.0.0 on a 64-bit 
> Ubuntu 10.04 system for Python 2.6.5. The build process starts ok, but 
> after sometime the following message
>
> *creating /usr/local/lib/python2.6/dist-packages/mpl_toolkits
> *
> is displayed and the build comes to a halt. I looked in this folder 
> and it is empty. Note, I need vers. 1.0.0 since the previous version 
> (0.99.1.2) that is available with the Synaptic Package Manager, does 
> not contain some modules that I need for my applications.
>
> Any suggestions would be appreciated --- I do need Matplotlib 1.0.0 on 
> my Ubuntu 10.04 system.

I just tried building the most recent version of matplotlib on a 64-bit 
Ubuntu 10.04 system and the build proceeded without any errors.  As 
shown on the installation instructions page 
(http://matplotlib.sourceforge.net/users/installing.html), ensure that 
you have installed ipython, numpy, libpng and freetype.  You should also 
have the package build-essential on your system.  Then, I think that you 
should run the following commands:

python setup.py build
sudo python setup.py install

Since /usr/local/lib is a system directory, perhaps the problem is due 
to permissions required to write to this directory?