I found some graphs with graph 6 string containing "\n" as a substring. But, then
g=Graph('XZ|f|a\nvrMxUrw}~iuhZjV~fxg~s^X[~~XZqlyuT~^~n~nnT~h')
calls an error:
RuntimeError: The string (XZ|f|a) seems corrupt: for n = 25, the string is too short.
Any ideas?
Thanks
I think that the problem is: the Graph constructor should treat "\n" as two characters, but "\n" in Python by default stands for a single character, a newline. If you preface the string with "r", it should work:
sage: Graph(r'XZ|f|a\nvrMxUrw}~iuhZjV~fxg~s^X[~~XZqlyuT~^~n~nnT~h')
(The "r" tells Python that it's a "raw" string and to treat backslashes as actual backslashes, not as a part of a special character like a newline "\n" or a tab "\t".)
Alternatively, if you double the backslash, that should work:
sage: Graph('XZ|f|a\\nvrMxUrw}~iuhZjV~fxg~s^X[~~XZqlyuT~^~n~nnT~h')
I don't know enough about the graph6 format to say. It looks like newlines are acceptable in that format: you could have several graphs, one line for each. So when you evaluate "Graph(string)", it truncates "string" at the first newline. So how do you tell apart a string containing "\" followed by "n" vs. a string containing an actual newline delimiting the strings for two different graphs?
Asked: 2011-10-21 13:52:15 +0100
Seen: 964 times
Last updated: Oct 21 '11
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Can you give an example of a graph whose graph6 string contains "\n"? It's easier to test it out and look for a solution if we have an example to work with.