Thanks for the comments. I have installed package 'csdp' before. I got this error after I installed it.
在 2016年5月10日星期二 UTC+3下午3:32:59，vdelecroix写道： > > The error you get is quite strange. On my computer with sage-7.1 I got > > sage: graphs.CycleGraph(7).lovasz_theta() > Traceback (most recent call last): > ... > PackageNotFoundError: the package 'csdp' was not found. You can install > it by running 'sage -i csdp' in a shell > > Which is very explicit about what to do... could you install the csdp > package and try again? > > On 10/05/16 06:58, Sihuang Hu wrote: > > Hi guys, > > > > When I try to compute the lovasz theta number of some graph, it says > that > > > > *ValueError: could not convert string to float: failed.:*G = > > graphs.CycleGraph(7) > > V = Set(G.vertices()) > > L = [] > > for s in V.subsets(): > > L.append(G.subgraph(s)) > > > > L[68].lovasz_theta() > > > --------------------------------------------------------------------------- > > ValueError Traceback (most recent call > last) > > <ipython-input-53-0ad2fb49c2b1> in <module>() > > ----> 1 L[Integer(68)].lovasz_theta() > > > > > /home/shhu/Documents/SageMath/local/lib/python2.7/site-packages/sage/graphs/lovasz_theta.pyc > > > > in lovasz_theta(graph) > > 78 tf.close() > > 79 lines = subprocess.check_output([os.path.join(SAGE_LOCAL, > > 'bin', 'theta'), tf_name]) > > ---> 80 return float(lines.split()[-1]) > > > > ValueError: could not convert string to float: failed. > > > > Thanks in advance! > > > -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
