matplotlib-users Mailing List for matplotlib

On Tue, Dec 23, 2008 at 11:48 PM, Balaji S. Srinivasan
<ba...@st...> wrote:

> I figured out that this was due to an extra comma in setupext.py.
> Edit line 1347 to remove the extra comma, changing this:
>
> module = Extension(
>
> 'matplotlib.backends._backend_gdk',
> ['src/backend_gdk.c', ], #<---- HERE IS THE BAD EXTRA COMMA
> libraries = [],
> include_dirs=numpy_inc_dirs,
> )
>
> to this:
>
> module = Extension(
>
> 'matplotlib.backends._backend_gdk',
> ['src/backend_gdk.c' ],
> libraries = [],
> include_dirs=numpy_inc_dirs,
> )
>
> Then

This doesn't make any sense, because the two lists are identical::

In [127]: x = ['src/backend_gdk.c', ]

In [128]: len(x)
Out[128]: 1

In [129]: x
Out[129]: ['src/backend_gdk.c']

In [130]: y = ['src/backend_gdk.c']

In [131]: len(y)
Out[131]: 1

In [132]: y
Out[132]: ['src/backend_gdk.c']

In [133]: x==y
Out[133]: True

Mauro Cavalcanti wrote:
> Dear Anton,
>
> 2008/12/23 antonv <vas...@ya...>:
>   
>>  Also, because I figured out the data I need and already have the scripts in place
>> to extract the CSV files I would really like to keep it that way. Would it be possible to
>> just show me how to get from the csv file to the plot?
>>     
>
> Here is a short recipe:
>
> import numpy as np
>
> f = open("file.csv", "r")
> coords = np.loadtxt(f, delimiter=",", skiprows=1)
> lon = coords[:,0]
> lat = coords[:,1]
> dat = coords[:,2]
>
> where "file.csv" is a regular comma-separated values file in the format:
>
> Lat,Lon,Dat
> -61.05,10.4,20
> -79.43,9.15,50
> -70.66,9.53,10
> -63.11,7.91,40
> ...
>
> Hope this helps!
>
> Best regards,
>
>   
Since the arrays are 2D (for gridded data), a reshape is also needed, i.e.

lon.shape = (nlats,nlons)
lat.shape = (nlats,nlons)
data.shape = (nlats,nlons)

You'll  need to know what the grid dimensons (nlats,nlons) are.

-Jeff

Dear Anton,

2008/12/23 antonv <vas...@ya...>:
>  Also, because I figured out the data I need and already have the scripts in place
> to extract the CSV files I would really like to keep it that way. Would it be possible to
> just show me how to get from the csv file to the plot?

Here is a short recipe:

import numpy as np

f = open("file.csv", "r")
coords = np.loadtxt(f, delimiter=",", skiprows=1)
lon = coords[:,0]
lat = coords[:,1]
dat = coords[:,2]

where "file.csv" is a regular comma-separated values file in the format:

Lat,Lon,Dat
-61.05,10.4,20
-79.43,9.15,50
-70.66,9.53,10
-63.11,7.91,40
...

Hope this helps!

Best regards,

-- 
Dr. Mauro J. Cavalcanti
Ecoinformatics Studio
P.O. Box 46521, CEP 20551-970
Rio de Janeiro, RJ, BRASIL
E-mail: mau...@gm...
Web: http://studio.infobio.net
Linux Registered User #473524 * Ubuntu User #22717
"Life is complex. It consists of real and imaginary parts."

Hi,

I had the following error message when I tried to install
matplotlib-0.98.5.2.tar.gz from source.
The build and install process seemed to proceed without errors, but when I
tried
"import pylab", I got the following traceback:

    File /usr/local/lib/python2.5/site-packages/pylab.py, line 1, in
<module>
        from matplotlib.pylab import *
    File /usr/local/lib/python2.5/site-packages/matplotlib/pylab.py, line
249, in <module>
        from matplotlib.pyplot import *
    File /usr/local/lib/python2.5/site-packages/matplotlib/pyplot.py, line
75, in <module>
        new_figure_manager, draw_if_interactive, show = pylab_setup()
    File /usr/local/lib/python2.5/site-packages/matplotlib/backends/init.py,
line 23, in pylab_setup
        globals(),locals(),[backend_name])
    File
/usr/local/lib/python2.5/site-packages/matplotlib/backends/backend_gtkagg.py,
line 10, in <module>
        from matplotlib.backends.backend_gtk import gtk, FigureManagerGTK,
FigureCanvasGTK, File
/usr/local/lib/python2.5/site-packages/matplotlib/backends/backend_gtk.py,
line 21, in <module>
        from matplotlib.backends.backend_gdk import RendererGDK,
FigureCanvasGDK
    File
/usr/local/lib/python2.5/site-packages/matplotlib/backends/backend_gdk.py,
line 29, in <module>
        from matplotlib.backends._backend_gdk import pixbuf_get_pixels_array
ImportError: No module named _backend_gdk


I figured out that this was due to an extra comma in setupext.py.
Edit line 1347 to remove the extra comma, changing this:

 module = Extension(

 'matplotlib.backends._backend_gdk',
['src/backend_gdk.c', ], #<---- HERE IS THE BAD EXTRA COMMA
libraries = [],
include_dirs=numpy_inc_dirs,
)

 to this:

 module = Extension(

 'matplotlib.backends._backend_gdk',
['src/backend_gdk.c' ],
libraries = [],
include_dirs=numpy_inc_dirs,
)

 Then

python setup.py build
sudo python setup.py install
python -c "import pylab"

works as expected.