[AstroPy] Aplpy FITSFigure does not open any window

[Vittorio_Roma2]

Dear all

I am having a problem with aplpy.

I am using Python 3.5.2 under ubuntu 16.04 and installed aplpy version 1.1.1

through pip3 install aplpy


The first problem arises when importing aplpy:


import/home/vittorio/.local/lib/python3.5/site-packages/matplotlib/cbook/deprecation.py:106: 
MatplotlibDeprecationWarning: The mpl_toolkits.axes_grid module was 
deprecated in version 2.1. Use mpl_toolkits.axes_grid1 and 
mpl_toolkits.axisartist provies the same functionality instead.
   warnings.warn(message, mplDeprecation, stacklevel=1)

I have tried to substitute mpl_toolkits.axes_grid1 with 
mpl_toolkits.axes_grid in core.py

but then I got an error (and not a warning)  saying that axes_grid1 does 
not have some method.

This will just return a failure and stop everything.


Anyways, when I do

 >>> fitsfile='somefile.fits'
 >>> F=aplpy.FITSFigure(fitsfile)
WARNING: Cannot determine equinox. Assuming J2000. [aplpy.wcs_util]
WARNING: Cannot determine equinox. Assuming J2000. [aplpy.wcs_util]
 >>> F.show_grayscale()
INFO: Auto-setting vmin to  3.416e+03 [aplpy.core]
INFO: Auto-setting vmax to  2.212e+04 [aplpy.core]


No window at all is opening. I have also tried giving as input of FITSFIgure
astropy.io.fits.open objects but again, no graphical window shows up.

I have found some workaround, that is, after the above instructions, to give

 >>>hdu_list=fits.open(fitsfile)
 >>>image_data=hdu_list[0].data
 >>>plt.imshow(image_data,'gray',clim=[4500,9000])
 >>>plt.show(block=False)

This does open an astrometrized image, with the labels of the X and Y axis
in the right place. However, this does not allow me to use any of the
FITSFigure methods. Neither I can add subplots to put annotations. Finally,
to add markers, I am forced to do another workaround: to
give pixel coordinates like this

 >>>plt.scatter(pixcoords[:,0],pixcoords[:,1])

where pixcoords comes from WCS transformations.

I have also tried a workaround, giving,e.g.

 >>>F.add_label(0.5,0.5,'ssss',relative=True)

and do the plt.imshow and plt.show later, but this still does not work.

To sum up, while it is true that  I can live with the workarounds for some
very basic figures, all of this is slowing down the script and I can't call
any of the FITSFigure methods

Any help would really be appreciated

Best regards, Vittorio