matplotlib-devel Mailing List for matplotlib

I'm posting this because of the other thread Darren started.

I managed to reinstall python (and the modules I use) several days ago
and tried again to run matplotlib with Numeric as the default backend,
but got the same error (the same error Darren is getting). Then I
installed numpy, and everything was fixed :)

Best,
Edin

On 10/22/06, Edin Salkovic <edi...@gm...> wrote:
> Unfortunately, I forgot to do it :(
>
> Then, just after sending the message to the list, it sprang to my
> mind. To make it worse, I then mistakenly entered:
> rm -Rf /path/to/site-packages
>
> no matplotlib at the end, and hit enter.
>
> There goes my beautiful Python install. :'(
>
> Is there some switch to setup.py to make it remove the mpl dir or does
> one allways have to do it by hand?
>
> Cheers,
> Edin
>
> On 10/22/06, Darren Dale <dd...@co...> wrote:
> > Did you try deleting your old mpl directory from site-packages, remove the
> > build directory from you mpl sources, and rebuild from scratch?
> >
> >
> >
> > On Sunday 22 October 2006 6:59 am, Edin Salkovic wrote:
> > > Hi,
> > >
> > > I built and installed the latest matplotlib from SVN.
> > >
> > > When I type:
> > > >>> from pylab import *
> > > >>> plot([1,2,3])
> > >
> > > I get:
> > >
> > > Traceback (most recent call last):
> > >   File "<stdin>", line 1, in ?
> > >   File "/usr/lib/python2.4/site-packages/matplotlib/pylab.py", line
> > > 2027, in plot
> > >     ret =  gca().plot(*args, **kwargs)
> > >   File "/usr/lib/python2.4/site-packages/matplotlib/axes.py", line
> > > 2131, in plot    self.autoscale_view(scalex=scalex, scaley=scaley)
> > >   File "/usr/lib/python2.4/site-packages/matplotlib/axes.py", line
> > > 985, in autoscale_view
> > >     self.set_xlim(XL)
> > >   File "/usr/lib/python2.4/site-packages/matplotlib/axes.py", line
> > > 1227, in set_xlim
> > >     self.viewLim.intervalx().set_bounds(xmin, xmax)
> > > TypeError: only length-1 arrays can be converted to Python scalars.
> > >
> > > I'm using Numeric as numerix. I'm on a Ubuntu box with python 2.4.
> > >
> > > -------------------------------------------------------------------------
> > > Using Tomcat but need to do more? Need to support web services, security?
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> > > _______________________________________________
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> >
> > --
> > Darren S. Dale, Ph.D.
> > dd...@co...
> >
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>

I'm playing with subplots_adjust, and I'm not comfortable with
parameters wspace and hspace.

Reading the doc, and the code, I've understood that:
- left, bottom, right and top can be considered as a "percentage" of
figure's width and height
- wspace and hspace can be considered as a "percentage" of subplots's
width and height

In other words, left/bottom/right/top and wspace/hspace are not given
in the same "unit": the former is given in "figure unit" whereas the
latter is given in "subplot unit".

I find these convention difficult to use when you try, for example, to have:
wspace = left margin + right margin
hspace = top margin + bottom margin

Here is some Python code to be clear:

left_margin, bottom_margin, right_margin, top_margin = 0.06, 0.06, 0, 0.1
pylab.subplots_adjust(
    left=left_margin,
    bottom=bottom_margin,
    right=1-right_margin,
    top=1-top_margin,
    wspace=left_margin+right_margin,
    hspace=bottom_margin+top_margin
)

I tried, but it doesn't work as intended because i guessed wspace and
hspace are a ratio of figure's size, but it seems they are a ratio of
subplot's size, aren't they?

Is it a design choice or just a matter of fact? Do you want to keep it
that way or do you agree to change it?

For example, with R (where I came from), figure's margin and subplot's
margin are expressed in the same unit: inches or "lines" (a unit
corresponding to the height of a line... very useful).

Nicolas Grilly

Let me correct that, I only see this problem with Numeric. numarray and numpy 
appear to be fine.

On Friday 10 November 2006 13:23, Darren Dale wrote:
> Can anyone reproduce this error? I am using up-to-date svn matplotlib, with
> either numpy or numeric:
>
> plot([1,2])
>
> ---------------------------------------------------------------------------
> exceptions.TypeError                                 Traceback (most recent
> call last)
>
> /home/darren/<ipython console>
>
> /usr/lib64/python2.4/site-packages/matplotlib/pylab.py in plot(*args,
> **kwargs)
>    3087         hold(h)
>    3088     try:
> -> 3089         ret =  gca().plot(*args, **kwargs)
>    3090         draw_if_interactive()
>    3091     except:
>
> /usr/lib64/python2.4/site-packages/matplotlib/axes.py in plot(self, *args,
> **kwargs)
>    2137         lines = [line for line in lines] # consume the generator
>    2138
> -> 2139         self.autoscale_view(scalex=scalex, scaley=scaley)
>    2140         return lines
>    2141
>
> /usr/lib64/python2.4/site-packages/matplotlib/axes.py in
> autoscale_view(self, tight, scalex, scaley)
>     991             if xl[1] < xl[0]:
>     992                 XL = XL[::-1]
> --> 993             self.set_xlim(XL)
>     994         if scaley:
>     995             yl = self.get_ylim()
>
> /usr/lib64/python2.4/site-packages/matplotlib/axes.py in set_xlim(self,
> xmin, xmax, emit)
>    1233             xmax += 1e-38
>    1234
> -> 1235         self.viewLim.intervalx().set_bounds(xmin, xmax)
>    1236         if emit: self._send_xlim_event()
>    1237         return xmin, xmax
>
> TypeError: only length-1 arrays can be converted to Python scalars.

>>>>> "Nicolas" == Nicolas Grilly <nic...@ga...> writes:

    Nicolas> I guess there is a very little error in documentation of
    Nicolas> pylab.subplots_adjust.

    Nicolas> The order of the arguments in the current doc is:
    Nicolas> subplots_adjust(left=None, right=None, bottom=None,
    Nicolas> top=None, wspace=0.2, hspace=0.2)

    Nicolas> The correct order of the arguments seems to be:
    Nicolas> subplots_adjust(left=None, bottom=None, right=None,
    Nicolas> top=None, wspace=0.2, hspace=0.2)

    Nicolas> Is it correct?

Yep that's right, thanks.  I always use the kwarg version and hadn't
noticed the docstring bug.

JDH

I guess there is a very little error in documentation of
pylab.subplots_adjust.

The order of the arguments in the current doc is:
    subplots_adjust(left=None, right=None, bottom=None, top=None, wspace=0.2,
hspace=0.2)

The correct order of the arguments seems to be:
    subplots_adjust(left=None, bottom=None, right=None, top=None, wspace=0.2,
hspace=0.2)

Is it correct?

Thanks,

Nicolas

-- 
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Nicolas Grilly
Tel +33 1 45 72 48 78
Mob +33 6 03 00 25 34
www.garden-paris.com

Can anyone reproduce this error? I am using up-to-date svn matplotlib, with 
either numpy or numeric:

plot([1,2])

---------------------------------------------------------------------------
exceptions.TypeError                                 Traceback (most recent 
call last)

/home/darren/<ipython console>

/usr/lib64/python2.4/site-packages/matplotlib/pylab.py in plot(*args, 
**kwargs)
   3087         hold(h)
   3088     try:
-> 3089         ret =  gca().plot(*args, **kwargs)
   3090         draw_if_interactive()
   3091     except:

/usr/lib64/python2.4/site-packages/matplotlib/axes.py in plot(self, *args, 
**kwargs)
   2137         lines = [line for line in lines] # consume the generator
   2138
-> 2139         self.autoscale_view(scalex=scalex, scaley=scaley)
   2140         return lines
   2141

/usr/lib64/python2.4/site-packages/matplotlib/axes.py in autoscale_view(self, 
tight, scalex, scaley)
    991             if xl[1] < xl[0]:
    992                 XL = XL[::-1]
--> 993             self.set_xlim(XL)
    994         if scaley:
    995             yl = self.get_ylim()

/usr/lib64/python2.4/site-packages/matplotlib/axes.py in set_xlim(self, xmin, 
xmax, emit)
   1233             xmax += 1e-38
   1234
-> 1235         self.viewLim.intervalx().set_bounds(xmin, xmax)
   1236         if emit: self._send_xlim_event()
   1237         return xmin, xmax

TypeError: only length-1 arrays can be converted to Python scalars.

Darren