org.netlib.lapack
Class Slangb

java.lang.Object
  extended by org.netlib.lapack.Slangb

public class Slangb
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 * ======= * * SLANGB returns the value of the one norm, or the Frobenius norm, or * the infinity norm, or the element of largest absolute value of an * n by n band matrix A, with kl sub-diagonals and ku super-diagonals. * * Description * =========== * * SLANGB returns the value * * SLANGB = ( max(abs(A(i,j))), NORM = 'M' or 'm' * ( * ( norm1(A), NORM = '1', 'O' or 'o' * ( * ( normI(A), NORM = 'I' or 'i' * ( * ( normF(A), NORM = 'F', 'f', 'E' or 'e' * * where norm1 denotes the one norm of a matrix (maximum column sum), * normI denotes the infinity norm of a matrix (maximum row sum) and * normF denotes the Frobenius norm of a matrix (square root of sum of * squares). Note that max(abs(A(i,j))) is not a matrix norm. * * Arguments * ========= * * NORM (input) CHARACTER*1 * Specifies the value to be returned in SLANGB as described * above. * * N (input) INTEGER * The order of the matrix A. N >= 0. When N = 0, SLANGB is * set to zero. * * KL (input) INTEGER * The number of sub-diagonals of the matrix A. KL >= 0. * * KU (input) INTEGER * The number of super-diagonals of the matrix A. KU >= 0. * * AB (input) REAL array, dimension (LDAB,N) * The band matrix A, stored in rows 1 to KL+KU+1. The j-th * column of A is stored in the j-th column of the array AB as * follows: * AB(ku+1+i-j,j) = A(i,j) for max(1,j-ku)<=i<=min(n,j+kl). * * LDAB (input) INTEGER * The leading dimension of the array AB. LDAB >= KL+KU+1. * * WORK (workspace) REAL array, dimension (LWORK), * where LWORK >= N when NORM = 'I'; otherwise, WORK is not * referenced. * * ===================================================================== * * * .. Parameters ..


Constructor Summary
Slangb()
           
 
Method Summary
static float slangb(java.lang.String norm, int n, int kl, int ku, float[] ab, int _ab_offset, int ldab, float[] work, int _work_offset)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Slangb

public Slangb()
Method Detail

slangb

public static float slangb(java.lang.String norm,
                           int n,
                           int kl,
                           int ku,
                           float[] ab,
                           int _ab_offset,
                           int ldab,
                           float[] work,
                           int _work_offset)