matplotlib-users Mailing List for matplotlib

Ken - Thanks very much or the quick reply - but the problem is more 
fundamental:

I probably obscured the issue by including the traceback.
The label rotation fails because there are no labels - the index is out 
of range - but circumventing this error still results in a plot with no 
x tick labels.
At the bottom of my original message, I indicated that commenting out 
the rotation enables the code to run to completion but no date labels 
are generated.

--Jim

On Dec 16, 2005, at 9:14 AM, Ken McIvor wrote:

> On 12/16/05 10:56, James Boyle wrote:
>> I get the following traceback:
>> Traceback (most recent call last):
>>   File "_tmp_date_demo2.py", line 46, in ?
>>     setp(labels, rotation=45)
>>   File  
>> "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
>> python2.3/site-packages/matplotlib/pylab.py", line 1533, in setp
>>     ret = _setp(*args, **kwargs)
>>   File  
>> "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
>> python2.3/site-packages/matplotlib/artist.py", line 468, in setp
>>     insp = ArtistInspector(h)
>>   File  
>> "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
>> python2.3/site-packages/matplotlib/artist.py", line 260, in __init__
>>     if iterable(o): o = o[0]
>> IndexError: list index out of range
>
> I think you've ran into the same problem Vinj Vinj had a little while 
> ago:
>
> 	http://sourceforge.net/mailarchive/message.php?msg_id=14103209
>
> John Hunter recommended the following solution:
>
> 	http://sourceforge.net/mailarchive/message.php?msg_id=14107408
>
> I'm not sure if you'll need to watch out for this, but Alan Isaac 
> cautioned that this fix may not work correctly under Python 2.4:
>
> 	http://sourceforge.net/mailarchive/message.php?msg_id=14108794
>
> I hope this helps!
>
> Ken
>
>
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I notice that when generating several plots, they are cascaded upon
one another, one slightly to the right and below of the previous one.
However, when the plots get near the bottom of the screen, they keep
cascading even when only the top of the plot can be seen. Should the
cascading not reset when the *bottom* of a frame touches the bottom of
the screen, and not the top?

Also, when the previous plot disappears prior to the current plot, is
there any need to cascade them at all? Currently, the plots cascade
even when prior plots have disappeared.

Thanks,
--
Chris Fonnesbeck
Atlanta, GA

On 12/16/05 10:56, James Boyle wrote:
> 
> I get the following traceback:
> 
> Traceback (most recent call last):
>   File "_tmp_date_demo2.py", line 46, in ?
>     setp(labels, rotation=45)
>   File  "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
> python2.3/site-packages/matplotlib/pylab.py", line 1533, in setp
>     ret = _setp(*args, **kwargs)
>   File  "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
> python2.3/site-packages/matplotlib/artist.py", line 468, in setp
>     insp = ArtistInspector(h)
>   File  "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
> python2.3/site-packages/matplotlib/artist.py", line 260, in __init__
>     if iterable(o): o = o[0]
> IndexError: list index out of range

I think you've ran into the same problem Vinj Vinj had a little while ago:

	http://sourceforge.net/mailarchive/message.php?msg_id=14103209

John Hunter recommended the following solution:

	http://sourceforge.net/mailarchive/message.php?msg_id=14107408

I'm not sure if you'll need to watch out for this, but Alan Isaac cautioned 
that this fix may not work correctly under Python 2.4:

	http://sourceforge.net/mailarchive/message.php?msg_id=14108794

I hope this helps!

Ken

I am using matplotlib 0.84 on OS X 10.3.9, Agg backend.

The  way in which I reverse axes ( axis values getting smaller going  
left to right or bottom to top) uses the following code:

ax = subplot(111)
..
xLim = ax.get_xlim()
ax.set_xlim( (xLim[1],xLim[0]))
.
.
I do not know if this is the best way - but it has worked up to now.

If I try to use this method  on an axis that uses dates, the method  
fails in that no tick labels are generated.
The actual plot is flipped around but there are no tick labels.

In the code below I have attempted to flip the x-axis in the  
date_demo2.py from the examples directory.
I have added lines 36-37.
I get the following traceback:

Traceback (most recent call last):
   File "_tmp_date_demo2.py", line 46, in ?
     setp(labels, rotation=45)
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/pylab.py", line 1533, in setp
     ret = _setp(*args, **kwargs)
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/artist.py", line 468, in setp
     insp = ArtistInspector(h)
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/artist.py", line 260, in __init__
     if iterable(o): o = o[0]
IndexError: list index out of range

However if I comment out the lines which rotate the x labels, the code  
runs but the resulting plot has no x (date) labels.

Thanks for any help.
--Jim

date_demo2.py
#!/usr/bin/env python
"""
Show how to make date plots in matplotlib using date tick locators and
formatters.  See major_minor_demo1.py for more information on
controlling major and minor ticks
"""
import datetime
from pylab import *
from matplotlib.dates import MONDAY, SATURDAY
from matplotlib.finance import quotes_historical_yahoo
from matplotlib.dates import MonthLocator, WeekdayLocator, DateFormatter


date1 = datetime.date( 2002, 1, 5 )
date2 = datetime.date( 2003, 12, 1 )

mondays   = WeekdayLocator(MONDAY)    # every monday
months    = MonthLocator(range(1,13), bymonthday=1)           # every  
month
monthsFmt = DateFormatter("%b '%y")


quotes = quotes_historical_yahoo('INTC', date1, date2)
if not quotes:
     print 'Found no quotes'
     raise SystemExit

dates = [q[0] for q in quotes]
opens = [q[1] for q in quotes]

ax = subplot(111)
plot_date(dates, opens, '-')
ax.xaxis.set_major_locator(months)
ax.xaxis.set_major_formatter(monthsFmt)
ax.xaxis.set_minor_locator(mondays)
ax.autoscale_view()
xLim = ax.get_xlim()
ax.set_xlim( (xLim[1],xLim[0]))
#ax.xaxis.grid(False, 'major')
#ax.xaxis.grid(True, 'minor')

labels = ax.get_xticklabels()
setp(labels, rotation=45)

grid(True)
savefig('date_demo2')

             Hello,

just a small question. There are any plan to remove the limit to plot 
large array with imshow/matshow?
It's impossible now to plot a large array (5000x5000 pixels for 
example). I remember to have this problem and John told that come from 
agg who has a limit. I tried to not use agg but Gtk alone and it's very 
very slow to draw event a 2000x2000 image. It's seems that MPL is doing 
always in interpolation to draw an array so after a certain size is 
taking too much memory and I obtain a

MemoryError: Couldn't allocate requested memory

I would like to know if it's possible or will possible to have an option 
who are drawing an array with the value of the pixel with any 
interpolation, resampling or other things? Perhaps something like this 
will help to plot large array. I would like to create a software in 
python and matplotlib to work on large fits image but know it's pretty 
impossible to do it but in the same time pgplot is old and sometime I 
feel it :)

Thanks for this great software.

N.