# Troubleshooting¶

## Crotate Warning¶

The SunPy map class has a custom rotate functionality, similar to IDL’s ROT function. This uses a Python C-API extension which should be compiled by installing sunpy. If for any reason this build process fails, you will not be able to use the C-API rotate code, but will be able to still use all the functionality of map.

If this happens you will encounter the following warning upon using the rotate method

>>> rot_map = mymap.rotate(10)
sunpy/map/map.py:829: Warning: The C extension sunpy.image.Crotate is not installed, falling back to the interpolation='spline' of order=3
warnings.warn("The C extension sunpy.image.Crotate is not installed, falling back to the interpolation='spline' of order=3" ,Warning)


What happens is, because the C-API extension is not found, the rotate() function defaults to the spline interpolation method of order 3 which is implemented in scipy.

To fix the C-API you should try and reinstall SunPy, if this still fails please ask the mailing list for assistance.

## Obtaining sunpy version¶

To find out your sunpy version number, import it and print the __version__ attribute:

>>> import sunpy
>>> sunpy.__version__


## System Info¶

To quickly collect information on your system, you can use our convenience function system_info which you can run through:

>>> import sunpy
>>> sunpy.util.system_info()


The output should look something like:

==========================================================
SunPy Installation Information

Sunday, 18. November 2012 11:06PM UT
==========================================================

###########
General
###########
OS: Mac OS X 10.8.2 (i386)
Python: 2.7.3 (64bit)

####################
Required libraries
####################
SunPy: 0.1
NumPy: 1.6.2
SciPy: 0.10.1
Matplotlib: 1.2.x
PyFITS: 3.0.8
pandas: 0.8.1

#######################
Recommended libraries
#######################
beautifulsoup4: 4.1.1
PyQt: 4.9.4
SUDS: 0.4'


This information is especially useful if you are running into a bug and need help.

## sunpy install location¶

You can find what directory sunpy is installed in by importing it and printing the __file__ attribute:

>>> import sunpy
>>> sunpy.__file__


## .sunpy directory location¶

Each user should have a .sunpy/ directory which should contain a sunpyrc file. To locate your .sunpy/ directory, use sunpy.print_config():

>>> import sunpy as sun
>>> sun.print_config()


On unix-like systems, this directory is generally located in your HOME directory. On windows, it is in your documents and settings directory by default.

If you would like to use a different configuration directory, you can do so by specifying the location in your SUNPY_CONFIGDIR environment variable.

## Report a problem¶

If you are having a problem with sunpy, search the mailing lists first: it is possible that someone else has already run into your problem.

If not, please provide the following information in your e-mail to the mailing list:

• your operating system; (Linux/UNIX users: post the output of uname -a)

• sunpy version:

>>> import sunpy
>>> sunpy.util.system_info()

• how you obtained sunpy.

• any customizations to your sunpyrc file (see Customizing SunPy).

• Please try to provide a minimal, standalone Python script that demonstrates the problem. This is the critical step. If you can’t post a piece of code that we can run and reproduce your error, the chances of getting help are significantly diminished. Very often, the mere act of trying to minimize your code to the smallest bit that produces the error will help you find a bug in your code that is causing the problem.

You will likely get a faster response writing to the mailing list than filing a bug in the bug tracker. If your problem has been determined to be a bug and can not be quickly solved, the issues may be filed a bug in the tracker so the issue doesn’t get lost.