Re: Mathematica 8 bug (related to Graph[])
- To: mathgroup at smc.vnet.net
- Subject: [mg117489] Re: Mathematica 8 bug (related to Graph[])
- From: Murray Eisenberg <murray at math.umass.edu>
- Date: Sun, 20 Mar 2011 04:54:38 -0500 (EST)
Same thing in 8.0.1, including getting a True result after copying the Output[1] result. I suggest you file a bug report at suggestions at wolfram.com. (Or using the form at http://www.wolfram.com/support/contact/email/?topic=Feedback) On 3/19/2011 6:18 AM, Szabolcs wrote: > Dear MathGroup members, > > There appears to be another bug in graph processing functions: > > In[1]:= jj = Subgraph[Graph[{1, 2, 3, 4}, {3 -> 4}], {1, 2, 3}] > > Out[1]=<picture of a graph> > > In[2]:= IsomorphicGraphQ[jj, Graph[{1, 2, 3}, {}]] > > Out[2]= False > > In[3]:= InputForm[jj] > > Out[3]//InputForm= > Graph[{1, 2, 3}, {}] > > Strangely, if I copy and paste the output from Out[1] into the > IsomorphicGraphQ[] function, then the problem doesn't manifest > itself! To reproduce it, evaluate the input exactly as shown above > (try in a new session). Generally, any action that pulls the graph- > expression through the front-end seems to "fix" the problem. > > Can you reproduce the bug in Mathematica 8.0.1? > > Cheers, > Szabolcs > -- Murray Eisenberg murray at math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 549-1020 (H) University of Massachusetts 413 545-2859 (W) 710 North Pleasant Street fax 413 545-1801 Amherst, MA 01003-9305