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Build the PMFG graph from a similarity matrix

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Calculates the PMFG graph from a matrix of weights W (typically a similarity measure, e.g. correlations)
 PMFG = doPMFG(W) returns the palnar maximally filtered graph (PMFG)
 PMFG is a sparse matrix with PMFG(i,j)=W(i,j) if the edge i-j is present
 and PMFG(i,j)=0 if not
 W must be sparse, real, square and symmetric

 Tomaso Aste
 UCL Computer Science

Please refer to:

T. Aste, T. Di Matteo and S. T. Hyde,
Complex Networks on Hyperbolic Surfaces,
Physica A 346 (2005) 20-26.

M. Tumminello, T. Aste, T. Di Matteo, R.N. Mantegna,
A tool for filtering information in complex systems,
Proceedings of the National Academy of Sciences of the United States
of America (PNAS) 102 (2005) 10421-10426.

in your published research.

MATLAB release MATLAB 8.0 (R2012b)
Other requirements This function uses "matlab_bgl" package from and which must be installed
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