org.netlib.lapack
Class Sgeql2

java.lang.Object
  org.netlib.lapack.Sgeql2

public class Sgeql2
extends java.lang.Object

Following is the description from the original
Fortran source.  For each array argument, the Java
version will include an integer offset parameter, so
the arguments may not match the description exactly.
Contact seymour@cs.utk.edu with any questions.


 *     ..
 *
 *  Purpose
 *  =======
 *
 *  SGEQL2 computes a QL factorization of a real m by n matrix A:
 *  A = Q * L.
 *
 *  Arguments
 *  =========
 *
 *  M       (input) INTEGER
 *          The number of rows of the matrix A.  M >= 0.
 *
 *  N       (input) INTEGER
 *          The number of columns of the matrix A.  N >= 0.
 *
 *  A       (input/output) REAL array, dimension (LDA,N)
 *          On entry, the m by n matrix A.
 *          On exit, if m >= n, the lower triangle of the subarray
 *          A(m-n+1:m,1:n) contains the n by n lower triangular matrix L;
 *          if m <= n, the elements on and below the (n-m)-th
 *          superdiagonal contain the m by n lower trapezoidal matrix L;

 *          the remaining elements, with the array TAU, represent the
 *          orthogonal matrix Q as a product of elementary reflectors
 *          (see Further Details).
 *
 *  LDA     (input) INTEGER
 *          The leading dimension of the array A.  LDA >= max(1,M).
 *
 *  TAU     (output) REAL array, dimension (min(M,N))
 *          The scalar factors of the elementary reflectors (see Further

 *          Details).
 *
 *  WORK    (workspace) REAL array, dimension (N)
 *
 *  INFO    (output) INTEGER
 *          = 0: successful exit
 *          < 0: if INFO = -i, the i-th argument had an illegal value
 *
 *  Further Details
 *  ===============
 *
 *  The matrix Q is represented as a product of elementary reflectors
 *
 *     Q = H(k) . . . H(2) H(1), where k = min(m,n).
 *
 *  Each H(i) has the form
 *
 *     H(i) = I - tau * v * v'
 *
 *  where tau is a real scalar, and v is a real vector with
 *  v(m-k+i+1:m) = 0 and v(m-k+i) = 1; v(1:m-k+i-1) is stored on exit in

 *  A(1:m-k+i-1,n-k+i), and tau in TAU(i).
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

Sgeql2()

Method Summary

static void

sgeql2(int m, int n, float[] a, int _a_offset, int lda, float[] tau, int _tau_offset, float[] work, int _work_offset, intW info)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Sgeql2

public Sgeql2()

Method Detail

sgeql2

public static void sgeql2(int m,
                          int n,
                          float[] a,
                          int _a_offset,
                          int lda,
                          float[] tau,
                          int _tau_offset,
                          float[] work,
                          int _work_offset,
                          intW info)