Q:

getting errors when trying to install matplotlib and numpy using pip

I have python version 3.3. I did install pip and now trying to install matplotlib and numpy.
pip install matplotlib
pip install numpy

I get these errors:
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/distutils/sysconfig.py", line 191, in customize_compiler

    _osx_support.customize_compiler(_config_vars)

  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/_osx_support.py", line 418, in customize_compiler

    _find_appropriate_compiler(_config_vars)

  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/_osx_support.py", line 191, in _find_appropriate_compiler

    "Cannot locate working compiler")

SystemError: Cannot locate working compiler

----------------------------------------
Cleaning up...
  Removing temporary dir /private/var/folders/fz/4bjb8_8x4rs_8r97vrh92_mh0000gn/T/pip_build_ayseburcuozdal...
Command python setup.py egg_info failed with error code 1 in /private/var/folders/fz/4bjb8_8x4rs_8r97vrh92_mh0000gn/T/pip_build_ayseburcuozdal/numpy
Exception information:
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/pip-1.5-py3.3.egg/pip/basecommand.py", line 122, in main
    status = self.run(options, args)
  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/pip-1.5-py3.3.egg/pip/commands/install.py", line 270, in run
    requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/pip-1.5-py3.3.egg/pip/req.py", line 1206, in prepare_files
    req_to_install.run_egg_info()
  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/pip-1.5-py3.3.egg/pip/req.py", line 312, in run_egg_info
    command_desc='python setup.py egg_info')
  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/pip-1.5-py3.3.egg/pip/util.py", line 696, in call_subprocess
    % (command_desc, proc.returncode, cwd))

A:

Numpy  requires a C compiler in order to be installed. This error message suggests to me that you do not have a C compiler installed or that pip can't find it.
Alternatively you might be able to source the binaries for numpy if you do not have a compiler available to you. See the numpy website for more installation information: http://docs.scipy.org/doc/numpy/user/install.html

