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---
:name: clangt
:md5sum: 652ea6ab81e8f71ce9bebc5bc9493bb5
:category: :function
:type: real
:arguments:
- norm:
:type: char
:intent: input
- n:
:type: integer
:intent: input
- dl:
:type: complex
:intent: input
:dims:
- n-1
- d:
:type: complex
:intent: input
:dims:
- n
- du:
:type: complex
:intent: input
:dims:
- n-1
:substitutions: {}
:fortran_help: " REAL FUNCTION CLANGT( NORM, N, DL, D, DU )\n\n\
* Purpose\n\
* =======\n\
*\n\
* CLANGT returns the value of the one norm, or the Frobenius norm, or\n\
* the infinity norm, or the element of largest absolute value of a\n\
* complex tridiagonal matrix A.\n\
*\n\
* Description\n\
* ===========\n\
*\n\
* CLANGT returns the value\n\
*\n\
* CLANGT = ( max(abs(A(i,j))), NORM = 'M' or 'm'\n\
* (\n\
* ( norm1(A), NORM = '1', 'O' or 'o'\n\
* (\n\
* ( normI(A), NORM = 'I' or 'i'\n\
* (\n\
* ( normF(A), NORM = 'F', 'f', 'E' or 'e'\n\
*\n\
* where norm1 denotes the one norm of a matrix (maximum column sum),\n\
* normI denotes the infinity norm of a matrix (maximum row sum) and\n\
* normF denotes the Frobenius norm of a matrix (square root of sum of\n\
* squares). Note that max(abs(A(i,j))) is not a consistent matrix norm.\n\
*\n\n\
* Arguments\n\
* =========\n\
*\n\
* NORM (input) CHARACTER*1\n\
* Specifies the value to be returned in CLANGT as described\n\
* above.\n\
*\n\
* N (input) INTEGER\n\
* The order of the matrix A. N >= 0. When N = 0, CLANGT is\n\
* set to zero.\n\
*\n\
* DL (input) COMPLEX array, dimension (N-1)\n\
* The (n-1) sub-diagonal elements of A.\n\
*\n\
* D (input) COMPLEX array, dimension (N)\n\
* The diagonal elements of A.\n\
*\n\
* DU (input) COMPLEX array, dimension (N-1)\n\
* The (n-1) super-diagonal elements of A.\n\
*\n\n\
* =====================================================================\n\
*\n"
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