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arpack

Solves large-scale eigenvalue problems using iterative methods

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Routines to solve large scale eigenvalue problems

Commands

arpack

Examples

Link ARPACK library in C/C++ code to solve eigenvalue problems$ gcc -o eigensolve eigensolve.c -larpack -lblas -llapack

Use ARPACK in Fortran code for sparse matrix eigendecomposition$ gfortran -o eigensolve eigensolve.f90 -larpack -lblas -llapack

Access ARPACK through Python scipy library for eigenvalue computation$ python -c "from scipy.sparse.linalg import eigs; import numpy as np; A = np.random.rand(100,100); eigs(A, k=5)"