search for: arpack

...ember some specific functionalities in MATLAB for sparse matrices, I started a research how to optimize the calculation of eigenvalues of a sparse matrix. The function eigen itself works with the LAPACK library which has no special handling for sparse matrices, same for the EISPACK library. The ARPACK library is capable to work with sparse matrices but I couldn't find any useful R package using ARPACK. The Matrix package can handle sparse matrices but has no further useful functionalities (concerning my tasks). Does one of you have any advice how to optimize the eigenvalue calculation of...

Hi, I am having trouble with some code that I am dyn.loading. I am writing an interface to ARPACK. I compile my interface (dssimp.cc), and link it against the ARPACK library (libarpack_SUN4.a): g++ -shared -static -fPIC dssimp.cc -o dssimp.so -larpack_SUN4 -lg2c -lm I can dyn.load the code and it appears OK. However, when I call my function, the call to the function in the ARPACK library re...

Dear all, I want to compute the eigenvalues of a complex matrix for some statistics. Comparing it to its matlab/octave sibling, I don't get the same eigenvalues in R computing it from the exact same matrix. In R, I used eigen() and arpack() that give different eigenvalues. In matlab/octave I used eig() and eigs() that give out the same eigenvalues but different to the R ones. For real matrices, R and matlab/octave are consistent. Does anybody know what could go on here and how I could get consistent eigenvalues in R? Since I defini...

igraph is a package for graphs and networks. It has a C core and uses a simple and fast graph representation allowing millions of vertices and edges. NEW FEATURES: - We use the ARPACK library for graph related eigenvalue problems, like Page Rank calculation, Kleinberg's hub and authority scores, eigenvector centrality, etc. There is also a generic interface if someone wants to use ARPACK for a different (not necessarily graph-related) problem. - We support the BL...

igraph is a package for graphs and networks. It has a C core and uses a simple and fast graph representation allowing millions of vertices and edges. NEW FEATURES: - We use the ARPACK library for graph related eigenvalue problems, like Page Rank calculation, Kleinberg's hub and authority scores, eigenvector centrality, etc. There is also a generic interface if someone wants to use ARPACK for a different (not necessarily graph-related) problem. - We support the BL...

...d in -lgmp... no configure: creating ./config.status config.status: creating src/config.h config.status: creating R/config.R config.status: creating src/Makevars ** libs gcc -std=gnu99 -I/usr/lib/R/include -I/usr/local/include -DUSING_R -I. -g -O2 -DPACKAGE_VERSION=\"0.5\" -DINTERNAL_ARPACK -DINTERNAL_LAPACK -DINTERNAL_BLAS -fpic -g -O2 -c adjlist.c -o adjlist.o igraph.h:435: warning: inline function ?igraph_es_type? declared but never defined igraph.h:233: warning: inline function ?igraph_vs_type? declared but never defined igraph.h:435: warning: inline function ?igraph_es_type? dec...

...lpdesk/help/techdoc/ref/eigs.html). This function differs from the standard "eigen" in that it computes a *few* eigenvectors for cases in which your matrix is very large and/or you don't need all the eigenvectors. (It uses the Arnoldi-Lanczos iterative method, as implemented in C in ARPACK). For example, this is the case for classical multidimensional scaling when you only need the first 2 eigenvectors. I feel almost certain that something like this is probably somewhere in R, possibly even as a (hidden) subroutine within a function like cmdscale. However, I didn't turn anythin...

Hello all, I was wondering if there is a function in R that only computes the eigenvector corresponding to the largest/smallest eigenvalue of an arbitrary real matrix. Thanks Minh -- Living on Earth may be expensive, but it includes an annual free trip around the Sun.

...ny gfortran compile calls), and eventually ended with: ++ -shared -o igraph.so DensityGrid.o DensityGrid_3d.o NetDataTypes.o NetRoutines.o adjlist.o amd_1.o amd_2.o amd_aat.o amd_control.o amd_defaults.o amd_dump.o amd_info.o amd_order.o amd_post_tree.o amd_postorder.o amd_preprocess.o amd_valid.o arpack.o array.o atlas.o attributes.o basic_query.o bfgs.o bigint.o bignum.o bipartite.o blas.o bliss.o bliss_eqrefhash.o bliss_graph.o bliss_heap.o bliss_orbit.o bliss_partition.o bliss_timer.o bliss_utils.o cattributes.o centrality.o cliques.o clustertool.o cocitation.o cohesive_blocks.o colamd.o commun...

Last time I tried, a few years back, Wine was not yet up to handling Garmin's proprietary topo map software. It would install, and sometimes even work, so long as I didn't try to connect a GPS to it. (The ones I have are all also Garmins -- old ones wanting a serial port.) I made a huge effort, for most of a year, with a lot of help from high-powered Alpha Plus Technoids on several