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DTRTI2(l)) DTRTI2(l)NAMEDTRTI2 - compute the inverse of a real upper or lower triangular matrixSYNOPSISSUBROUTINE DTRTI2( UPLO, DIAG, N, A, LDA, INFO ) CHARACTER DIAG, UPLO INTEGER INFO, LDA, N DOUBLE PRECISION A( LDA, * )PURPOSEDTRTI2 computes the inverse of a real upper or lower triangular matrix. This is the Level 2 BLAS version of the algorithm.ARGUMENTSUPLO (input) CHARACTER*1 Specifies whether the matrix A is upper or lower triangular. = 'U': Upper trian- gular = 'L': Lower triangular DIAG (input) CHARACTER*1 Specifies whether or not the matrix A is unit triangular. = 'N': Non-unit trian- gular = 'U': Unit triangular N (input) INTEGER The order of the matrix A. N >= 0. A (input/output) DOUBLE PRECISION array, dimension (LDA,N) On entry, the triangular matrix A. If UPLO = 'U', the leading n by n upper trian- gular part of the array A contains the upper triangular matrix, and the strictly lower triangular part of A is not referenced. If UPLO = 'L', the leading n by n lower triangular part of the array A contains the lower triangular matrix, and the strictly upper triangular part of A is not referenced. If DIAG = 'U', the diago- nal elements of A are also not referenced and are assumed to be 1. On exit, the (triangular) inverse of the original matrix, in the same storage for- mat. LDA (input) INTEGER The leading dimension of the array A. LDA >= max(1,N). INFO (output) INTEGER = 0: successful exit < 0: if INFO =, the k-th argument had an illegal value-kLAPACK version 3.015 June 2000 DTRTI2(l)

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