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## org.netlib.lapack
Class STPRFS

    java.lang.Object
      org.netlib.lapack.STPRFS

    public class STPRFS

extends java.lang.Object

    STPRFS is a simplified interface to the JLAPACK routine stprfs.
    This interface converts Java-style 2D row-major arrays into
    the 1D column-major linearized arrays expected by the lower
    level JLAPACK routines.  Using this interface also allows you
    to omit offset and leading dimension arguments.  However, because
    of these conversions, these routines will be slower than the low
    level ones.  Following is the description from the original Fortran
    source.  Contact seymour@cs.utk.edu with any questions.

     *     ..
     *
     *  Purpose
     *  =======
     *
     *  STPRFS provides error bounds and backward error estimates for the
     *  solution to a system of linear equations with a triangular packed
     *  coefficient matrix.
     *
     *  The solution matrix X must be computed by STPTRS or some other
     *  means before entering this routine.  STPRFS does not do iterative
     *  refinement because doing so cannot improve the backward error.
     *
     *  Arguments
     *  =========
     *
     *  UPLO    (input) CHARACTER*1
     *          = 'U':  A is upper triangular;
     *          = 'L':  A is lower triangular.
     *
     *  TRANS   (input) CHARACTER*1
     *          Specifies the form of the system of equations:
     *          = 'N':  A * X = B  (No transpose)
     *          = 'T':  A**T * X = B  (Transpose)
     *          = 'C':  A**H * X = B  (Conjugate transpose = Transpose)
     *
     *  DIAG    (input) CHARACTER*1
     *          = 'N':  A is non-unit triangular;
     *          = 'U':  A is unit triangular.
     *
     *  N       (input) INTEGER
     *          The order of the matrix A.  N >= 0.
     *
     *  NRHS    (input) INTEGER
     *          The number of right hand sides, i.e., the number of columns
     *          of the matrices B and X.  NRHS >= 0.
     *
     *  AP      (input) REAL array, dimension (N*(N+1)/2)
     *          The upper or lower triangular matrix A, packed columnwise 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)*(2*n-j)/2) = A(i,j) for j<=i<=n.

     *          If DIAG = 'U', the diagonal elements of A are not referenced

     *          and are assumed to be 1.
     *
     *  B       (input) REAL array, dimension (LDB,NRHS)
     *          The right hand side matrix B.
     *
     *  LDB     (input) INTEGER
     *          The leading dimension of the array B.  LDB >= max(1,N).
     *
     *  X       (input) REAL array, dimension (LDX,NRHS)
     *          The solution matrix X.
     *
     *  LDX     (input) INTEGER
     *          The leading dimension of the array X.  LDX >= max(1,N).
     *
     *  FERR    (output) REAL array, dimension (NRHS)
     *          The estimated forward error bound for each solution vector
     *          X(j) (the j-th column of the solution matrix X).
     *          If XTRUE is the true solution corresponding to X(j), FERR(j)

     *          is an estimated upper bound for the magnitude of the largest

     *          element in (X(j) - XTRUE) divided by the magnitude of the
     *          largest element in X(j).  The estimate is as reliable as
     *          the estimate for RCOND, and is almost always a slight
     *          overestimate of the true error.
     *
     *  BERR    (output) REAL array, dimension (NRHS)
     *          The componentwise relative backward error of each solution
     *          vector X(j) (i.e., the smallest relative change in
     *          any element of A or B that makes X(j) an exact solution).
     *
     *  WORK    (workspace) REAL array, dimension (3*N)
     *
     *  IWORK   (workspace) INTEGER array, dimension (N)
     *
     *  INFO    (output) INTEGER
     *          = 0:  successful exit
     *          < 0:  if INFO = -i, the i-th argument had an illegal value
     *
     *  =====================================================================
     *
     *     .. Parameters ..

Constructor Summary
`STPRFS()`

Method Summary
`static void` | `STPRFS(java.lang.String uplo, java.lang.String trans, java.lang.String diag, int n, int nrhs, float[] ap, float[][] b, float[][] x, float[] ferr, float[] berr, float[] work, int[] iwork, intW info)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### STPRFS

    public STPRFS()

Method Detail

### STPRFS

    public static void STPRFS(java.lang.String uplo,
                              java.lang.String trans,
                              java.lang.String diag,
                              int n,
                              int nrhs,
                              float[] ap,
                              float[][] b,
                              float[][] x,
                              float[] ferr,
                              float[] berr,
                              float[] work,
                              int[] iwork,
                              intW info)

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