Comments on: Python and Geography: Input Output Models and Graph Theory http://michalisavraam.org/2009/05/python-and-geography-input-output-models-and-graph-theory/ a spatial web presence Fri, 27 Aug 2010 19:39:46 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Ruslan http://michalisavraam.org/2009/05/python-and-geography-input-output-models-and-graph-theory/comment-page-1/#comment-929 Ruslan Tue, 27 Apr 2010 01:14:03 +0000 http://michalisavraam.org/blog/38-blog-entries/54-geopy-graph#comment-929 Hi Michalis, I just came across your blog today from a review in GIS Development magazine. This is really a fantastic & resourceful blog. You surely have contributed a lot to the GIS community. Regards Ruslan Hi Michalis,

I just came across your blog today from a review in GIS Development magazine. This is really a fantastic & resourceful blog. You surely have contributed a lot to the GIS community.

Regards
Ruslan

]]> By: Michalis Avraam http://michalisavraam.org/2009/05/python-and-geography-input-output-models-and-graph-theory/comment-page-1/#comment-867 Michalis Avraam Thu, 15 Apr 2010 01:07:23 +0000 http://michalisavraam.org/blog/38-blog-entries/54-geopy-graph#comment-867 MO, This should be possible in multiple methods. Are your data in an Excel sheet already? Then using xlrd to read them would be the way to go. As for the adjacency matrix calculation... I assume you have 45,000 nodes. I believe NetworkX can handle this. It also allows you to export a network graph to a numpy matrix populated with adjacency values. Which is very very good indeed, so you can avoid any calculations. If you want to contact me personally, maybe I can help with your code as well. Michalis MO,

This should be possible in multiple methods. Are your data in an Excel sheet already? Then using xlrd to read them would be the way to go. As for the adjacency matrix calculation… I assume you have 45,000 nodes. I believe NetworkX can handle this. It also allows you to export a network graph to a numpy matrix populated with adjacency values. Which is very very good indeed, so you can avoid any calculations.

If you want to contact me personally, maybe I can help with your code as well.

Michalis

]]> By: MO http://michalisavraam.org/2009/05/python-and-geography-input-output-models-and-graph-theory/comment-page-1/#comment-860 MO Wed, 14 Apr 2010 02:35:15 +0000 http://michalisavraam.org/blog/38-blog-entries/54-geopy-graph#comment-860 I have a data set of almost 45000 lines and i want to read it from excel worksheet to python and then want to compute the adjacency matrix. as i have tried this in Matlab and i failed because of the memory issues with Matlab. is it possible in Python. I have a data set of almost 45000 lines and i want to read it from excel worksheet to python and then want to compute the adjacency matrix. as i have tried this in Matlab and i failed because of the memory issues with Matlab. is it possible in Python.

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