NAG FL Interface
x04eaf (print_​matrix_​integer)

1 Purpose

2 Specification

3 Description

4 References

5 Arguments

1: $\mathbf{matrix}$ – Character(1) Input

On entry: indicates the part of the matrix to be printed.

$\mathbf{matrix}=\text{'G'}$

The whole of the rectangular matrix.

$\mathbf{matrix}=\text{'L'}$

The lower triangle of the matrix, or the lower trapezium if the matrix has more rows than columns.

$\mathbf{matrix}=\text{'U'}$

The upper triangle of the matrix, or the upper trapezium if the matrix has more columns than rows.

Constraint: $\mathbf{matrix}=\text{'G'}$, $\text{'L'}$ or $\text{'U'}$.

2: $\mathbf{diag}$ – Character(1) Input

On entry: unless $\mathbf{matrix}=\text{'G'}$, diag must specify whether the diagonal elements of the matrix are to be printed.

$\mathbf{diag}=\text{'B'}$

The diagonal elements of the matrix are not referenced and not printed.

$\mathbf{diag}=\text{'U'}$

The diagonal elements of the matrix are not referenced, but are assumed all to be unity, and are printed as such.

$\mathbf{diag}=\text{'N'}$

The diagonal elements of the matrix are referenced and printed.

If $\mathbf{matrix}=\text{'G'}$, then diag need not be set.

Constraint: if $\mathbf{matrix}\ne \text{'G'}$, $\mathbf{diag}=\text{'B'}$, $\text{'U'}$ or $\text{'N'}$.

3: $\mathbf{m}$ – Integer Input

4: $\mathbf{n}$ – Integer Input

On entry: the number of rows and columns of the matrix, respectively, to be printed.

If either m or n is less than $1$, x04eaf will exit immediately after printing title; no row or column labels are printed.

5: $\mathbf{a}\left(\mathbf{lda},*\right)$ – Integer array Input

Note: the second dimension of the array a must be at least $\max \left(1,\mathbf{n}\right)$.

On entry: the matrix to be printed. Only the elements that will be referred to, as specified by arguments matrix and diag, need be set.

6: $\mathbf{lda}$ – Integer Input

On entry: the first dimension of the array a as declared in the (sub)program from which x04eaf is called.

Constraint: $\mathbf{lda}\ge \max \left(1,\mathbf{m}\right)$.

7: $\mathbf{title}$ – Character(*) Input

On entry: a title to be printed above the matrix.

If $\mathbf{title}=\text{' '}$, no title (and no blank line) will be printed.

If title contains more than $80$ characters, the contents of title will be wrapped onto more than one line, with the break after $80$ characters.

Any trailing blank characters in title are ignored.

8: $\mathbf{ifail}$ – Integer Input/Output

On entry: ifail must be set to $0$, $-1\text{ or }1$. If you are unfamiliar with this argument you should refer to Section 4 in the Introduction to the NAG Library FL Interface for details.

For environments where it might be inappropriate to halt program execution when an error is detected, the value $-1\text{ or }1$ is recommended. If the output of error messages is undesirable, then the value $1$ is recommended. Otherwise, if you are not familiar with this argument, the recommended value is $0$. When the value $-\mathbf{1}\text{ or }\mathbf{1}$ is used it is essential to test the value of ifail on exit.

On exit: $\mathbf{ifail}=\mathbf{0}$ unless the routine detects an error or a warning has been flagged (see Section 6).

6 Error Indicators and Warnings

$\mathbf{ifail}=1$

On entry, matrix is not valid: $\mathbf{matrix}=〈\mathit{\text{value}}〉$.

$\mathbf{ifail}=2$

On entry, $\mathbf{matrix}=〈\mathit{\text{value}}〉$, but diag is not valid: $\mathbf{diag}=〈\mathit{\text{value}}〉$.

$\mathbf{ifail}=3$

On entry, $\mathbf{m}=〈\mathit{\text{value}}〉$ and $\mathbf{lda}=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{m}\le \mathbf{lda}$.

$\mathbf{ifail}=-99$

An unexpected error has been triggered by this routine. Please contact NAG.

See Section 7 in the Introduction to the NAG Library FL Interface for further information.

$\mathbf{ifail}=-399$

Your licence key may have expired or may not have been installed correctly.

See Section 8 in the Introduction to the NAG Library FL Interface for further information.

$\mathbf{ifail}=-999$

Dynamic memory allocation failed.

See Section 9 in the Introduction to the NAG Library FL Interface for further information.

7 Accuracy

8 Parallelism and Performance

9 Further Comments

NCOLS = 80
INDENT = 0
LABROW = 'I'
LABCOL = 'I'
FORM = ' '

10 Example

10.1 Program Text

10.2 Program Data

10.3 Program Results