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external subrs in SLATEC

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Old   December 14, 2003, 06:56
Default external subrs in SLATEC
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Hi, I want to use free library for solving linear system by CG method, for example, DCGN(Preconditioned CG Sparse Ax=b Solver) in SLATEC. However, external subroutines MATVEC, MTTVEC and MSOLVE are not included in fortran program of DCGN. Where can I get these subroutines. Thanks in advance.
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