2014/1/31 Felipe Eltermann <felipe.elterm...@gmail.com>:
> OK, I finished reading _tree.pyx and now I understand CSC dense matrix
> format.
> I have a general view of what is necessary to be implemented.
>
> I've never seriously used Cython. What are you guys using as development
> environment?

Just a good text editor and a shell terminal. What else?

> How to easily code/compile/test?

cython sklearn/tree/_tree.pyx
python setup.py build_ext -i
nosetests -s -v -x sklearn/tree/

You can check that you are not introducing too many new yellow lines
(C boilerplate) by using the HTML source annotation mode:

cython -a sklearn/tree/_tree.pyx
firefox sklearn/tree/_tree.html

Read the Cython documentation for more details: http://cython.org/

-- 
Olivier

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