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Hello 
I am using matplotlib 1.0.0 version. and would like to use the imshow() to display my 2D image [512 X 1024]
so when I use the imshow() command as 
imshow(array,origin='lower',interpolation='bilinear')
xlables - [0,100,200,400,500]
ylabels - [0,200,400,600,800,1000]
which is correct as by default the imshow will set the grid number as the labels.
Now, physical size of this grid is [52 X 152] .... so to get that values, I use the following command
imshow(array,origin='lower',interpolation='bilinear',extend=[0.0,52.0,0.0,152.0])
and the image that I obtain is not correct. 
By not correct I mean that the important features in the image are not at the positions where I expect them to be while transforming from [512 X 1024] grid to
[52 X 152] physical grid. 
I presume this could be due to the fact that the extent just divides the axis in uniform grid ... however my grid is not uniform. 
But I do know the pixel width (dx and dy) at each position.
I have tried to use pcolor but somehow the pcolor() is too slow for such a large grid.
Can anyone help me in getting the X, and Y values correct on the axes , using imshow() and complete grid information, when I transform from [512 X 1024] grid to [52 X 152] physical grid.
Cheers
Bhargav Vaidya.

Thanks guys! This is exactly what I was looking for. The axes_grid1 toolkit
works like a charm. I have attached a revised version of the example I had
before with a few minor modifications and some descriptive text at the top.
Is there a standard way for non-developers (i.e. users) to contribute
examples like these?
Thanks again!
http://old.nabble.com/file/p30807907/grid_histogram.py grid_histogram.py 
http://old.nabble.com/file/p30807907/grid_histogram.png 
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On 1/30/11 6:59 PM, Peter Smale wrote:
> Hi,
> I am using Basemap 1.0 and matplotlib 1.0 on Ubuntu 10.10. I would like
> to use the Hammer projection from the Basemap toolkit but when I use
>
> m = Basemap(resolution='c',projection='hammer',lon_0=180)
>
> I get an error (shown below).
>
> Does anyone know where the Hammer has gone?
>
> Thanks,
> Peter
Peter: hammer was added after 1.0.0 was released - so you have to 
update from svn to get it. I am planning on releasing 1.0.1 soon (in the 
next week or so).
-Jeff
>
>
> Traceback (most recent call last):
> File "md_sinPlot.py", line 37, in<module>
> m = Basemap(resolution='c',projection='hammer',lon_0=180)
> File
> "/usr/local/lib/python2.6/dist-packages/mpl_toolkits/basemap/__init__.py",
> line 700, in __init__
> raise ValueError(_unsupported_projection % projection)
> ValueError: 'hammer' is an unsupported projection.
> The supported projections are:
> aeqd Azimuthal Equidistant
> poly Polyconic
> gnom Gnomonic
> moll Mollweide
> tmerc Transverse Mercator
> nplaea North-Polar Lambert Azimuthal
> gall Gall Stereographic Cylindrical
> mill Miller Cylindrical
> merc Mercator
> stere Stereographic
> npstere North-Polar Stereographic
> geos Geostationary
> nsper Near-Sided Perspective
> vandg van der Grinten
> laea Lambert Azimuthal Equal Area
> mbtfpq McBryde-Thomas Flat-Polar Quartic
> sinu Sinusoidal
> spstere South-Polar Stereographic
> lcc Lambert Conformal
> npaeqd North-Polar Azimuthal Equidistant
> eqdc Equidistant Conic
> cyl Cylindrical Equidistant
> omerc Oblique Mercator
> aea Albers Equal Area
> spaeqd South-Polar Azimuthal Equidistant
> ortho Orthographic
> cass Cassini-Soldner
> splaea South-Polar Lambert Azimuthal
> robin Robinson
>
> ------------------------------------------------------------------------------
> Special Offer-- Download ArcSight Logger for FREE (a 49ドル USD value)!
> Finally, a world-class log management solution at an even better price-free!
> Download using promo code Free_Logger_4_Dev2Dev. Offer expires
> February 28th, so secure your free ArcSight Logger TODAY!
> http://p.sf.net/sfu/arcsight-sfd2d
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Here is the axes_grid1 version. I only attach the *axins* part.
It is not identical to your original example and have difference scales.
-JJ
ax1 = ax[ybins-1,1]
from mpl_toolkits.axes_grid1.inset_locator import zoomed_inset_axes, \
 mark_inset
axins = zoomed_inset_axes(parent_axes=ax1, zoom=2, loc=8,
 bbox_to_anchor=(0.5, 0.),
 bbox_transform=ax1.transAxes,
 axes_kwargs=dict(sharex=ax1, sharey=ax1),
 borderpad=-1.5, #padding in fraction of font size
 )
pp, p1, p2 = mark_inset(parent_axes=ax1, inset_axes=axins, loc1=3, loc2=4.,
 linestyle="dotted")
pp.set_visible(False)
axins.axesPatch.set_alpha(0.)
# we want to draw the bottom spine only
axins.set_frame_on(True)
axins.spines['top'].set_visible(False)
axins.spines['left'].set_visible(False)
axins.spines['right'].set_visible(False)
# don't draw the y axis ticks or labels
axins.set_yticks([])
axins.set_yticklabels([])
# only draw the bottom (x) axes
axins.xaxis.set_ticks_position('bottom')
axins.xaxis.set_label_position('bottom')
axins.set_xlabel('z-coordinate')
On Mon, Jan 31, 2011 at 2:08 AM, Benjamin Root <ben...@ou...> wrote:
> On Monday, January 24, 2011, johanngoetz <jg...@uc...> wrote:
>>
>> Hello,
>> A common task I have is to histogram one variable of a multidimensional
>> dataset as a function of two (or more) variables. I have attached an example
>> which shows exactly what I would like to do.
>>
>> The problem I would like to solve is the zoomed in x-axis which is the last
>> part of the script attached. I start by copying one of the subplots with
>> Axes.twiny() and proceed to adjust it and label it. The results are quite
>> nice but as soon as I start adjusting the plotted window or any of the
>> subplot spacing parameters, this "copy of an axis" does not transform
>> properly. Could anyone make a suggestion as to which transformations I
>> should use to shift and zoom the new axes? Or perhaps there is a better
>> method for drawing a zoomed in version of an axis?
>>
>> I would like to submit this to the examples/gallery page but feel that these
>> details need to be addressed, and I am not sure I know how to fix them.
>> Hopefully, I have commented this example enough that someone could follow
>> what I am doing.
>>
>> Thank you,
>> Johann
>>
>> http://old.nabble.com/file/p30748088/grid_plot.png
>>
>> http://old.nabble.com/file/p30748088/grid_plot.py grid_plot.py
>>
>>
>> --
>> View this message in context: http://old.nabble.com/zoomed-copy-of-axis-for-grid-of-subplots-tp30748088p30748088.html
>> Sent from the matplotlib - users mailing list archive at Nabble.com.
>>
>>
>> ------------------------------------------------------------------------------
>> Special Offer-- Download ArcSight Logger for FREE (a 49ドル USD value)!
>> Finally, a world-class log management solution at an even better price-free!
>> Download using promo code Free_Logger_4_Dev2Dev. Offer expires
>> February 28th, so secure your free ArcSight Logger TODAY!
>> http://p.sf.net/sfu/arcsight-sfd2d
>> _______________________________________________
>> Matplotlib-users mailing list
>> Mat...@li...
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>>
>
> Have you checked out the axes_grid1 toolkit? I have seen some neat
> features there such as zoomed in plots and such. Maybe it could help
> you?
>
> Ben Root
>
> ------------------------------------------------------------------------------
> Special Offer-- Download ArcSight Logger for FREE (a 49ドル USD value)!
> Finally, a world-class log management solution at an even better price-free!
> Download using promo code Free_Logger_4_Dev2Dev. Offer expires
> February 28th, so secure your free ArcSight Logger TODAY!
> http://p.sf.net/sfu/arcsight-sfd2d
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>

Hi,
I am using Basemap 1.0 and matplotlib 1.0 on Ubuntu 10.10. I would like 
to use the Hammer projection from the Basemap toolkit but when I use
m = Basemap(resolution='c',projection='hammer',lon_0=180)
I get an error (shown below).
Does anyone know where the Hammer has gone?
Thanks,
Peter
Traceback (most recent call last):
 File "md_sinPlot.py", line 37, in <module>
 m = Basemap(resolution='c',projection='hammer',lon_0=180)
 File 
"/usr/local/lib/python2.6/dist-packages/mpl_toolkits/basemap/__init__.py", 
line 700, in __init__
 raise ValueError(_unsupported_projection % projection)
ValueError: 'hammer' is an unsupported projection.
The supported projections are:
 aeqd Azimuthal Equidistant
 poly Polyconic
 gnom Gnomonic
 moll Mollweide
 tmerc Transverse Mercator
 nplaea North-Polar Lambert Azimuthal
 gall Gall Stereographic Cylindrical
 mill Miller Cylindrical
 merc Mercator
 stere Stereographic
 npstere North-Polar Stereographic
 geos Geostationary
 nsper Near-Sided Perspective
 vandg van der Grinten
 laea Lambert Azimuthal Equal Area
 mbtfpq McBryde-Thomas Flat-Polar Quartic
 sinu Sinusoidal
 spstere South-Polar Stereographic
 lcc Lambert Conformal
 npaeqd North-Polar Azimuthal Equidistant
 eqdc Equidistant Conic
 cyl Cylindrical Equidistant
 omerc Oblique Mercator
 aea Albers Equal Area
 spaeqd South-Polar Azimuthal Equidistant
 ortho Orthographic
 cass Cassini-Soldner
 splaea South-Polar Lambert Azimuthal
 robin Robinson