Re: [Matplotlib-users] Matplotlib and Cpp

On Sunday, April 29, 2012, Ignas Anikevičius wrote:

> Hello everybody,
>
> On 28 April 2012 12:13, julien tayon <ju...@ta... <javascript:_e({},
> 'cvml', 'ju...@ta...');>> wrote:
>
>> First cpp stands for C Pre Processor, this tool usually does macro
>> substitution in c, objective c, c++. Hence Cpp in the object is pretty
>> much confusing when it seems to be talking about C++.
>>
>
> Sorry for my ignorance, will know it in the future
>
>
>> There is another simpler solution however :
>> Do everything in python : python is a very powerfull gluing langage,
>> the GIL ensuring that non thread-safe code is thread safe, it is very
>> forgiving with code not design for concurrency.
>>
>
> I wanted to write in Python as much code as possible, it is just some plot
> commands are quite slow in matplotlib. For example, I want to work in polar
> coordinate system to plot a function of 2 variables. For that I want to use
> the np.meshgrid function and the plot the results with the pcolor command
> from pyplot. The problem is that with a lot of data points it becomes very
> slow, which is not acceptable if one wants to draw a lot of plots using
> this function. Because the array is not ordered and points in space are at
> irregular intervals, I could not use imshow,  which is much much faster. So
> I was thinking if there is some internal C++ API which I could use and
> maybe speed up the plotting itself a bit.
>
> It would actually be very nice if I could do that as most of the toolkits,
> which can interface with C/C++ do not have LaTeX capabilites. Gnuplot can
> be used in C/C++, but as far as I remember it is not the most elegant way
> of doing it...
>
> Going back to the topic, is there any potential to speed up some commands
> (e.g. pcolor) by rewriting/extending them in Cython or C++? If yes, then
> maybe I might tinker with the code at some point, when I have more free
> time.
>
> Anyway, thanks for such detailed answers.
>
> All best,
> Ignas A.
>



Use pcolormesh().  *much* faster if you can assume certain things about the
domain.

Ben Root