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2016-01-18 12:21:09 +0200	answered a question	Change the edge thickness in a graph plot I figured it out. The answer is do not use `GraphPlot`. Use `GraphLatex`. GraphLatex makes fairly nice 2D plots as `tikzpicture` with latex formatting on labels and lots of great customisations options. I would put a link to the docs but for some reason I don't have any Karma yet and cannot. For large, dense graphs it can be hard to view the whole thing on the default settings that view(H) gives you. In that case export the latex to a file and compile it in a minimal document with `resizebox`, e.g., as follows: sage code: `H=graphs.CompleteGraph(100) H.set_latex_options( graphic_size=(200,200), #large value helps for large dense graphs vertex_size=1, edge_thickness=0.05,) #view(H) #just display the latex graph in sage or in pdf viewer with open('graph_tmp.tex','w') as f: f.write(latex(H))` latex document: `\documentclass{article} \usepackage{tkz-graph} \usepackage{savetrees} \begin{document} \resizebox{.9\textwidth}{.9\textwidth}{ \input{graph_tmp} } \end{document}`
2016-01-17 18:59:43 +0200	asked a question	Change the edge thickness in a graph plot I want to plot a graph with many edges, but they just end up looking like a black mass. I can see how to change vertex size and whatnot but not edge thickness. `sage: H=graphs.CompleteGraph(100) sage: H.show() Launched png viewer for Graphics object consisting of 5051 graphics primitives` Not sure where my karma went, but you can guess what this looks like.
2015-10-26 04:52:52 +0200	received badge	● Famous Question (source)
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2015-10-22 05:27:46 +0200	commented question	calling MixedIntegerLinearProgram gives AssertionError: The given source does not contain 'def'. How to fix this? Thanks for comment. I have also confirmed it works with the precompiled binary for sage 6.9. I'll close if I manage to compile a fresh copy of sage-6.9 and not reproduce this.
2015-10-22 04:18:39 +0200	asked a question	calling MixedIntegerLinearProgram gives AssertionError: The given source does not contain 'def'. How to fix this? When I call MixedIntegerLinearProgram I get the error AssertionError: The given source does not contain 'def'. This occurs both when calling any of its methods, like MixedIntegerLinearProgram.show(), and when viewing its documentation I get a backtrace in place of the documentation. I am running Mac OS 10.11 (El Capitan). I get the same error in my emacs sage interpreter and Terminal. I recently tried to upgrade from sage 6.5 to 6.9 and the build failed; ask me about that if you think it's related. sage is installed to my home directory. Please ask if more details are needed. Below is a full backtrace for a command I tried. sage: g=Graph({0:[1,3],1:[0,2],2:[1,3],3:[2,0]}) sage: g Graph on 4 vertices sage: plot(g) #I checked my graph sage: g.vertex_cut(0,2) --------------------------------------------------------------------------- AssertionError Traceback (most recent call last) <ipython-input-17-b3f3e7c533ca> in <module>() ----> 1 g.vertex_cut(Integer(0),Integer(2)) /Users/alejo/sage/local/lib/python2.7/site-packages/sage/graphs/generic_graph.pyc in vertex_cut(self, s, t, value_only, vertices, solver, verbose) 5525 5526 # Some vertices belong to part 1, some others to part 0 -> 5527 p.add_constraint(v[s] == 0) 5528 p.add_constraint(v[t] == 1) 5529 /Users/alejo/sage/src/sage/numerical/mip.pyx in sage.numerical.mip.MIPVariable.__getitem__ (build/cythonized/sage/numerical/mip.c:16841)() 2560 :meth:`MixedIntegerLinearProgram.new_variable`. 2561 """ -> 2562 2563 def __init__(self, parent, mip, vtype, name, lower_bound, upper_bound): 2564 r""" /Users/alejo/sage/src/sage/numerical/mip.pyx in sage.numerical.mip.MixedIntegerLinearProgram.__call__ (build/cythonized/sage/numerical/mip.c:3714)() 490 self._linear_constraints_parent = LinearConstraintsParent(LF) 491 return self._linear_constraints_parent --> 492 493 def __call__(self, x): 494 """ /Users/alejo/sage/src/sage/numerical/mip.pyx in sage.numerical.mip.MixedIntegerLinearProgram.linear_functions_parent (build/cythonized/sage/numerical/mip.c:3376)() 453 # Check for redundant constraints 454 self._check_redundant = check_redundant --> 455 if check_redundant: 456 self._constraints = list() 457 /Users/alejo/sage/src/sage/misc/cachefunc.pyx in sage.misc.cachefunc.CachedFunction.__call__ (build/cythonized/sage/misc/cachefunc.c:4678)() 917 True 918 sage: f(y) is not f(x) --> 919 True 920 921 """ /Users/alejo/sage/src/sage/misc/cachefunc.pyx in sage.misc.cachefunc.CachedFunction.argfix_init (build/cythonized/sage/misc/cachefunc.c:3203)() 719 """ 720 A = ArgumentFixer(self.f,classmethod=self.is_classmethod) --> 721 self._argument_fixer = A 722 if self.key: 723 self._fix_to_pos = self._fix_to_pos_and_create_key /Users/alejo/sage/src/sage/misc/function_mangling.pyx in sage.misc.function_mangling.ArgumentFixer.__init__ (build/cythonized/sage/misc/function_mangling.c:862)() 122 cdef public tuple _default_tuple 123 def __init__(self, f, classmethod = False): --> 124 try: 125 arg_names, varargs, varkw, defaults = sage_getargspec(f) 126 except AttributeError: /Users/alejo/sage/local/lib/python2.7/site-packages/sage/misc/sageinspect.pyc in sage_getargspec(obj) 1382 source = sage_getsource(obj, is_binary=True) 1383 if source: -> 1384 return inspect.ArgSpec(*_sage_getargspec_cython(source)) 1385 else: 1386 func_obj = obj /Users/alejo/sage/local/lib/python2.7/site-packages/sage/misc/sageinspect.pyc in _sage_getargspec_cython(source) 1007 """ 1008 defpos = source ... (more)