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# CentOS 7.0 - man page for cpttrf.f (centos section 3)

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 ```cpttrf.f(3) LAPACK cpttrf.f(3) NAME cpttrf.f - SYNOPSIS Functions/Subroutines subroutine cpttrf (N, D, E, INFO) CPTTRF Function/Subroutine Documentation subroutine cpttrf (integerN, real, dimension( * )D, complex, dimension( * )E, integerINFO) CPTTRF Purpose: CPTTRF computes the L*D*L**H factorization of a complex Hermitian positive definite tridiagonal matrix A. The factorization may also be regarded as having the form A = U**H *D*U. Parameters: N N is INTEGER The order of the matrix A. N >= 0. D D is REAL array, dimension (N) On entry, the n diagonal elements of the tridiagonal matrix A. On exit, the n diagonal elements of the diagonal matrix D from the L*D*L**H factorization of A. E E is COMPLEX array, dimension (N-1) On entry, the (n-1) subdiagonal elements of the tridiagonal matrix A. On exit, the (n-1) subdiagonal elements of the unit bidiagonal factor L from the L*D*L**H factorization of A. E can also be regarded as the superdiagonal of the unit bidiagonal factor U from the U**H *D*U factorization of A. INFO INFO is INTEGER = 0: successful exit < 0: if INFO = -k, the k-th argument had an illegal value > 0: if INFO = k, the leading minor of order k is not positive definite; if k < N, the factorization could not be completed, while if k = N, the factorization was completed, but D(N) <= 0. Author: Univ. of Tennessee Univ. of California Berkeley Univ. of Colorado Denver NAG Ltd. Date: September 2012 Definition at line 93 of file cpttrf.f. Author Generated automatically by Doxygen for LAPACK from the source code. Version 3.4.2 Tue Sep 25 2012 cpttrf.f(3)```
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