pttrs: triangular solve using factor

Functions
subroutine	cpttrs (uplo, n, nrhs, d, e, b, ldb, info)
	CPTTRS
subroutine	dpttrs (n, nrhs, d, e, b, ldb, info)
	DPTTRS
subroutine	spttrs (n, nrhs, d, e, b, ldb, info)
	SPTTRS
subroutine	zpttrs (uplo, n, nrhs, d, e, b, ldb, info)
	ZPTTRS

Detailed Description