Thank you very much Massimo. I will check if NetworkX can draw graphs without pyplot. Othercase I will have to draw my graphs from scratch using Figure, Axis, etc.
On Monday, April 14, 2014 3:28:43 PM UTC+2, Massimo Di Pierro wrote: > > matplotlib has two API. A stateless and a statefull. > > The statefull mode is called matplotlib.pyplot and is it designed for > some compatibility with Matlab. Most of the examples posted are with > pyplot. The problem is that pyplot does not work for multithreaded web apps > because the state is in a global object instead of a local variable. > > You need to convert your example so that it does not use pyplot. > > I am not sure how to do it in your case but look how Canvas handles > Figure, Axis, and Plots without pyplot. > > Massimo > > > > > On Sunday, 13 April 2014 12:32:05 UTC-5, Luis Fontes wrote: >> >> Thank you very much for your help Massimo. >> The problem I have is not how to plot easily in matplotlib. My problem is >> how to display >> in my web2py view the NetworkX drawing made using nx.draw without saving >> the png file in disk >> but using some code like: >> >> canvas=FigureCanvas(fig) >> stream=cStringIO.StringIO() >> canvas.print_png(stream) >> return stream.getvalue() >> >> as I have seen in the web2py Application Development Cookbook and in >> your >> paper "web2py for Scientific Applications" (2011). >> >> If you try for example: >> >> import matplotlib.pyplot as plt >> import networkx as nx >> G = nx.path_graph(21) >> nx.draw(G) >> plt.show() >> >> you get a plot. Now, how should I put this code in my model or controller >> to get >> the plot in my web2py view. >> >> Thank you for your help. >> >> >> >> >> >> >> >> >> On Sunday, April 13, 2014 5:59:39 PM UTC+2, Massimo Di Pierro wrote: >>> >>> Not sure but look into https://github.com/mdipierro/canvas >>> >>> On Saturday, 12 April 2014 04:10:42 UTC-5, Luis Fontes wrote: >>>> >>>> I am trying to plot a graph using NetworkX draw function but >>>> using cStringIO.StringIO(). I have read >>>> how to do it in web2py Application Development Cookbook. >>>> >>>> Let's say I have something like: >>>> >>>> import matplotlib.pyplot as plt >>>> import networkx as nx >>>> >>>> G = nx.path_graph(8) >>>> nx.draw(G) >>>> plt.show() >>>> >>>> This code plots and shows the graph. Now, to place it in a web2py view >>>> I should use a function like: >>>> >>>> >>>> def mygraph() >>>> fig=Figure() >>>> >>>> ..... >>>> ..... >>>> ..... >>>> >>>> canvas=FigureCanvas(fig) >>>> stream=cStringIO.StringIO() >>>> canvas.print_png(stream) >>>> return stream.getvalue() >>>> >>>> The problem is how to place the plot generated by nx.path_graph(8) and >>>> nx.draw(G) in the code in >>>> blue in order to make it work. >>>> >>>> I am learning web2py and I am nor expert in NetworkX or matplotlib >>>> packages. Sorry if my question >>>> is stupid. >>>> >>>> Thank you. >>>> >>>> -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
