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[top]DTPTTR(1LAPACK routine (version 3.2)DTPTTR(1)NAMEDTPTTR - copies a triangular matrix A from standard packed format (TP) to standard full format (TR)SYNOPSISSUBROUTINE DTPTTR( UPLO, N, AP, A, LDA, INFO ) CHARACTER UPLO INTEGER INFO, N, LDA DOUBLE PRECISION A( LDA, * ), AP( * )PURPOSEDTPTTR copies a triangular matrix A from standard packed format (TP) to standard full format (TR).ARGUMENTSUPLO (input) CHARACTER = 'U': A is upper triangular. = 'L': A is lower triangular. N (input) INTEGER The order of the matrix A. N >= 0. AP (input) DOUBLE PRECISION array, dimension ( N*(N+1)/2 ), On entry, the upper or lower triangular matrix A, packed colum‐ nwise in a linear array. The j-th column of A is stored in the array AP as follows: if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j; if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n. A (output) DOUBLE PRECISION array, dimension ( LDA, N ) On exit, the triangular matrix A. If UPLO = 'U', the leading N-by-N upper triangular part of A contains the upper triangular part of the matrix A, and the strictly lower triangular part of A is not referenced. If UPLO = 'L', the leading N-by-N lower triangular part of A contains the lower triangular part of the matrix A, and the strictly upper triangular part of A is not referenced. LDA (input) INTEGER The leading dimension of the array A. LDA >= max(1,N). INFO (output) INTEGER = 0: successful exit < 0: if INFO =, the i-th argument had an illegal value LAPACK routine (version 3.2) November 2008 DTPTTR(1)-i

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