zlangb zlange zlangt zlanhb zlanhe zlanhp zlanht zlansb zlansp zlansy zlantr

zlangb() double zlangb ( char  norm, int  n, int  kl, int  ku, int  ldab, doublecomplex  ab[], double  work[]  ) One norm, Frobenius norm, infinity norm, or largest absolute value of any element of a complex band matrix Purpose This routine returns the value of the one norm, the Frobenius norm, the infinity norm, or the largest absolute value of any element of an n x n complex band matrix A, with kl sub-diagonals and ku super-diagonals. Returns max(abs(Aij)) when norm = 'M', norm1(A) when norm = '1' or 'O', normI(A) when norm = 'I', or normF(A) when norm = 'F' 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(Aij)) is not a consistent matrix norm. Parameters [in] norm Specifies the value to be returned by zlangb as described above. [in] n Order of the matrix A. (n >= 0) (If n = 0, returns 0) [in] kl Number of sub-diagonals of the matrix A. (kl >= 0) [in] ku Number of super-diagonals of the matrix A. (ku >= 0) [in] ldab Leading dimension of the two dimensional array ab[][]. (ldab >= kl + ku + 1) [in] ab[][] Array ab[lab][ldab] (lab >= n) m x n band matrix A in kl+ku+1 x n band matrix form. [out] work[] Array work[lwork] (lwork >= max(1, n) when norm = 'I', otherwise work[] is not referenced) Work array. Reference LAPACK