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man pages->IRIX man pages -> complib/slangt (3)
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### Contents

```
SLANGT(3F)							    SLANGT(3F)

```

### NAME[Toc][Back]

```     SLANGT - return the value of the one norm,	or the Frobenius norm, or the
infinity norm, or the element of largest absolute value of	a real
tridiagonal matrix	A
```

### SYNOPSIS[Toc][Back]

```     REAL FUNCTION SLANGT( NORM, N, DL,	D, DU )

CHARACTER NORM

INTEGER   N

REAL	   D( *	), DL( * ), DU(	* )
```

### PURPOSE[Toc][Back]

```     SLANGT  returns the value of the one norm,	 or the	Frobenius norm,	or the
infinity norm,  or	the  element of	 largest absolute value	 of a real
tridiagonal matrix	A.

```

### DESCRIPTION[Toc][Back]

```     SLANGT returns the	value

SLANGT = ( 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[Toc][Back]

```     NORM    (input) CHARACTER*1
Specifies the value to be returned	in SLANGT as described above.

N	     (input) INTEGER
The order of the matrix A.	 N >= 0.  When N = 0, SLANGT is	set to
zero.

DL	     (input) REAL array, dimension (N-1)
The (n-1) sub-diagonal elements of	A.

D	     (input) REAL array, dimension (N)
The diagonal elements of A.

Page 1

SLANGT(3F)							    SLANGT(3F)

DU	     (input) REAL array, dimension (N-1)
The (n-1) super-diagonal elements of A.
SLANGT(3F)							    SLANGT(3F)

```

### NAME[Toc][Back]

```     SLANGT - return the value of the one norm,	or the Frobenius norm, or the
infinity norm, or the element of largest absolute value of	a real
tridiagonal matrix	A
```

### SYNOPSIS[Toc][Back]

```     REAL FUNCTION SLANGT( NORM, N, DL,	D, DU )

CHARACTER NORM

INTEGER   N

REAL	   D( *	), DL( * ), DU(	* )
```

### PURPOSE[Toc][Back]

```     SLANGT  returns the value of the one norm,	 or the	Frobenius norm,	or the
infinity norm,  or	the  element of	 largest absolute value	 of a real
tridiagonal matrix	A.

```

### DESCRIPTION[Toc][Back]

```     SLANGT returns the	value

SLANGT = ( 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[Toc][Back]

```     NORM    (input) CHARACTER*1
Specifies the value to be returned	in SLANGT as described above.

N	     (input) INTEGER
The order of the matrix A.	 N >= 0.  When N = 0, SLANGT is	set to
zero.

DL	     (input) REAL array, dimension (N-1)
The (n-1) sub-diagonal elements of	A.

D	     (input) REAL array, dimension (N)
The diagonal elements of A.

Page 1

SLANGT(3F)							    SLANGT(3F)

DU	     (input) REAL array, dimension (N-1)
The (n-1) super-diagonal elements of A.

PPPPaaaaggggeeee 2222```
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