The adjacency matrix of the graph is [0 1 0 0] [1 0 0 0] [0 0 0 1] [0 0 1 0]
在 2016年5月10日星期二 UTC+3下午4:30:06，Dima Pasechnik写道： > > What is your L[68] ? > This is probably something like a graph without edges... > > On Tuesday, May 10, 2016 at 1:53:17 PM UTC+1, Sihuang Hu wrote: >> >> 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): ur ... >>> 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
