I suggest you have a look at the source code in order to get into the nitty gritty of what rolling does. In particular I suggest you have a look at the rolling functions in generic.py and window.py. From there you can have a look at the Window class which is used if you specify … Read more
Robert Bradshaw helped me to get Robert Kern’s line_profiler tool working for cdef functions and I thought I’d share the results on stackoverflow. In short, set up a regular .pyx file and build script and add the following before your call to cythonize. # Thanks to @tryptofame for proposing an updated snippet from Cython.Compiler.Options import … Read more
Is it possible to optimize speed of a mission critical application developed in Django with Cython It’s doubtful. Most of a web application response time is the non-HTML elements that must be downloaded separately. The usual rule of thumb is 8 static files per HTML page. (.CSS, .JS, images, etc.) Since none of that static … Read more
Cython now has template support, and comes with declarations for some of the STL containers. See http://docs.cython.org/src/userguide/wrapping_CPlusPlus.html#standard-library Here’s the example they give: from libcpp.vector cimport vector cdef vector[int] vect cdef int i for i in range(10): vect.push_back(i) for i in range(10): print vect[i]
JetBrains has provided an answer: https://www.jetbrains.com/help/pycharm/2017.3/cython-speedups.html If you’re on Ubuntu, run: For Python 2.7: sudo apt-get install python-dev For Python 3.5: sudo apt-get install python3-dev For Python 3.6: sudo apt-get install python3.6-dev For Python 3.7: sudo apt-get install python3.7-dev
The key difference is in where the function can be called from: def functions can be called from Python and Cython while cdef function can be called from Cython and C. Both types of functions can be declared with any mixture of typed and untyped arguments, and in both cases the internals are compiled to … Read more
Sure ! (In the following, I assume that you already know how to deal with cimport and the interactions between .pxd and .pyx. If this is not completely the case, just ask and I will develop that part as well) The sample (grabbed from a C++ project of mine, but a C project would work … Read more
The simplest way I can find to work around this issue is to simply switch the order of multiplication. If in testcplx.pyx I change varc128 = varc128 * varf64 to varc128 = varf64 * varc128 I change from the failing situation to described to one that works correctly. This scenario is useful as it allows … Read more
Python setuptools solved the problem. http://docs.cython.org/src/quickstart/install.html easy_install cython or pip install cython
Just for a further reference, cython online docs says this is because Cython is using a deprecated Numpy API, and for the time being, it’s just a warning that we can ignore.