On Mon, Nov 16, 2009 at 1:54 PM, Kartik Thakore <thakore.kar...@gmail.com>wrote:
> Hi, > > So I fixed new_from to prevent it from segfaulting. Now as for direct write > from PLot to Surface, where can I see the how the raw data is stored and > made acessible in PDL. > > Kartik Thakore > Kartik - I've never looked too closely at the internals of PDL to know precisely how it stores the data, but as I understand, the data is typically stored in a packed scalar. The proper way to get at this data is using the get_dataref and upd_data member functions. These functions are discussed here: http://search.cpan.org/~chm/PDL-2.4.5/Basic/Core/Core.pm.PL#get_dataref For the PDL folks, who probably don't know what's going on, I am trying to make PLplot play with SDL. I would like to quickly draw animations of plots. Doug wrote an option into PLplot that allows it to plot to a memory location, and PDL::Graphics::PLplot is capable of specifying a piddle for this purpose. His original intention was to allow him to load an image into a piddle and overlay a graph. My intention is to make an SDL surface that uses the same memory location as a PLplot output, so that I can use SDL's quick redrawing mechanisms for fast interactive plotting. I don't actually need to get PDL involved in this - SDL would do well to interact directly with PLplot - but it's probably a good idea to interface SDL::Surfaces with PDL while we're at it. David
