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<H1>CMPH FAQ</H1>
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<UL>
<LI>How do I define the ids of the keys?
</UL>
<BLOCKQUOTE>
- You don't. The ids will be assigned by the algorithm creating the minimal
perfect hash function. If the algorithm creates an <B>ordered</B> minimal
perfect hash function, the ids will be the indices of the keys in the
input. Otherwise, you have no guarantee of the distribution of the ids.
</BLOCKQUOTE>
<UL>
<LI>Why do I always get the error "Unable to create minimum perfect hashing function"?
</UL>
<BLOCKQUOTE>
- The algorithms do not guarantee that a minimal perfect hash function can
be created. In practice, it will always work if your input
is big enough (>100 keys).
The error is probably because you have duplicated
keys in the input. You must guarantee that the keys are unique in the
input. If you are using a UN*X based OS, try doing
</BLOCKQUOTE>
<PRE>
#sort input.txt | uniq > input_uniq.txt
</PRE>
<BLOCKQUOTE>
and run cmph with input_uniq.txt
</BLOCKQUOTE>
<UL>
<LI>Why do I change the hash function using cmph_config_set_hashfuncs function and the default (jenkins)
one is executed?
</UL>
<BLOCKQUOTE>
- Probably you are you using the cmph_config_set_algo function after
the cmph_config_set_hashfuncs. Therefore, the default hash function
is reset when you call the cmph_config_set_algo function.
</BLOCKQUOTE>
<UL>
<LI>What do I do when the following error is got?
</UL>
<BLOCKQUOTE>
- Error: <B>error while loading shared libraries: libcmph.so.0: cannot open shared object file: No such file ordirectory</B>
</BLOCKQUOTE>
<BLOCKQUOTE>
- Solution: type <B>export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib/</B> at the shell or put that shell command
in your .profile file or in the /etc/profile file.
</BLOCKQUOTE>
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Enjoy!
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<P>
<A HREF="mailto:davi@users.sourceforge.net">Davi de Castro Reis</A>
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<A HREF="mailto:db8192@users.sourceforge.net">Djamel Belazzougui</A>
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<A HREF="mailto:fc_botelho@users.sourceforge.net">Fabiano Cupertino Botelho</A>
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<A HREF="mailto:nivio@dcc.ufmg.br">Nivio Ziviani</A>
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