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BLAS routines used by ARPACK

Tables 5.4-5.6 list all the BLAS subroutines called by ARPACK directly. We remark that there are other BLAS subroutines needed by ARPACK that are called by the LAPACK routines.

**Table 5.4:** Description of the Level three BLAS used by ARPACK.

1\|cROUTINE	1c\|DESCRIPTION

`Xtrmm`	Matrix times an upper triangular matrix.

**Table 5.5:** Description of the Level two BLAS used by ARPACK.

1\|cROUTINE	1c\|DESCRIPTION

`Xgemv`	Matrix vector product.
`[s,d]ger`	Rank one update to a real matrix.
`[c,z]geru`	Rank one update to a complex matrix.

**Table 5.6:** Description of the Level one BLAS used by ARPACK.

1\|cROUTINE	1c\|DESCRIPTION

`Xaxpy`	Compute a vector triad.
`Xscal`	Scale a vector.
`[s,d]dot`	Compute a real inner product.
`[c,z]dotc`	Compute a complex inner product.
`[cs,zd]scal`	Scale a complex vector with a real constant.
`[s,d]nrm2`	Computes the Euclidean norm of a real vector.
`[sc,dz]nrm2`	Computes the Euclidean norm of a complex vector.
`Xcopy`	Copy one vector to another.
`Xswap`	Swap two vectors

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Chao Yang
11/7/1997