Hi,

I am trying to use the function "community_leading_eigenvector()", but I've got 
the following error:

# Error:
Error at community.c:1349 :Wrong length for vector of predefined memberships, 
Invalid value

# Information:
gc3-user@igraph-tests:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 14.04.1 LTS
Release:        14.04
Codename:       trusty


$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.8.2-19ubuntu1' 
--with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs 
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr 
--program-suffix=-4.8 --enable-shared --enable-linker-build-id 
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix 
--with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls 
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug 
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap 
--enable-plugin --with-system-zlib --disable-browser-plugin 
--enable-java-awt=gtk --enable-gtk-cairo 
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home 
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64 
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64 
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar 
--enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 
--with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic 
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu 
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) 


g++ leadingeigenvector_test.cpp -I/usr/local/include/igraph/ -ligraph -o 
leadingeigenvector-zhao


# Extract of the code
…
f = fopen (inputFilename, "r");
  igraph_read_graph_edgelist(&g, f, 0, IGRAPH_UNDIRECTED);
  fclose(f);
  
  igraph_simplify(&g, 1, 1, 0);
  
  igraph_matrix_init(&merges, 0, 0);
  igraph_vector_init(&membership, 0);
  igraph_arpack_options_init(&options);
  
  
  clock_t start=clock();
  igraph_community_leading_eigenvector(&g, 0, &merges, &membership, 
igraph_vcount(&g), &options, &modularity, 0, 0, 0, 0, 0, 0);
  clock_t end=clock();
…

# While The same code works on MacOS-X (10.9.4)
* igraph 0.7.1 installed with Homebrew
* g++ 4.8

Does anyone know the reason why there is an error message?

Best regards,
Zhao




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