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!
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