ctrttf (l)  Linux Man Pages
ctrttf: copies a triangular matrix A from standard full format (TR) to rectangular full packed format (TF)
NAME
CTRTTF  copies a triangular matrix A from standard full format (TR) to rectangular full packed format (TF)SYNOPSIS
 SUBROUTINE CTRTTF(
 TRANSR, UPLO, N, A, LDA, ARF, INFO )
 CHARACTER TRANSR, UPLO
 INTEGER INFO, N, LDA
 COMPLEX A( 0: LDA1, 0: * ), ARF( 0: * )
PURPOSE
CTRTTF copies a triangular matrix A from standard full format (TR) to rectangular full packed format (TF) .ARGUMENTS
 TRANSR (input) CHARACTER

= aqNaq: ARF in Normal mode is wanted;
= aqCaq: ARF in Conjugate Transpose mode is wanted;  UPLO (input) CHARACTER

= aqUaq: A is upper triangular;
= aqLaq: A is lower triangular.  N (input) INTEGER
 The order of the matrix A. N >= 0.
 A (input) COMPLEX array, dimension ( LDA, N )
 On entry, the triangular matrix A. If UPLO = aqUaq, the leading NbyN upper triangular part of the array A contains the upper triangular matrix, and the strictly lower triangular part of A is not referenced. If UPLO = aqLaq, the leading NbyN lower triangular part of the array A contains the lower triangular matrix, and the strictly upper triangular part of A is not referenced.
 LDA (input) INTEGER
 The leading dimension of the matrix A. LDA >= max(1,N).
 ARF (output) COMPLEX*16 array, dimension ( N*(N+1)/2 ),
 On exit, the upper or lower triangular matrix A stored in RFP format. For a further discussion see Notes below.
 INFO (output) INTEGER

= 0: successful exit
< 0: if INFO = i, the ith argument had an illegal value
FURTHER DETAILS
We first consider Standard Packed Format when N is even.We give an example where N = 6.
Let TRANSR = `Naq. RFP holds AP as follows:
For UPLO = `Uaq the upper trapezoid A(0:5,0:2) consists of the last three columns of AP upper. The lower triangle A(4:6,0:2) consists of conjugatetranspose of the first three columns of AP upper. For UPLO = `Laq the lower trapezoid A(1:6,0:2) consists of the first three columns of AP lower. The upper triangle A(0:2,0:2) consists of conjugatetranspose of the last three columns of AP lower. To denote conjugate we place  above the element. This covers the case N even and TRANSR = `Naq.
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