NAG FL Interface
f01crf (real_​gen_​trans_​inplace)

1 Purpose

2 Specification

3 Description

4 References

5 Arguments

1: $\mathbf{a}\left(\mathbf{mn}\right)$ – Real (Kind=nag_wp) array Input/Output

On entry: the elements of the $m\times n$ matrix $A$, stored by columns.

On exit: the elements of the transpose matrix, also stored by columns.

2: $\mathbf{m}$ – Integer Input

On entry: $m$, the number of rows of the matrix $A$.

3: $\mathbf{n}$ – Integer Input

On entry: $n$, the number of columns of the matrix $A$.

4: $\mathbf{mn}$ – Integer Input

On entry: $\mathit{mn}$, the value $m\times n$.

5: $\mathbf{move}\left(\mathbf{lmove}\right)$ – Integer array Workspace

6: $\mathbf{lmove}$ – Integer Input

On entry: the dimension of the array move as declared in the (sub)program from which f01crf is called.

Suggested value: $\mathbf{lmove}=(m+n)/2$.

Constraint: $\mathbf{lmove}\ge 1$.

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

On entry: ifail must be set to $0$, $\mathrm{-1}$ or $1$ to set behaviour on detection of an error; these values have no effect when no error is detected.

A value of $0$ causes the printing of an error message and program execution will be halted; otherwise program execution continues. A value of $\mathrm{-1}$ means that an error message is printed while a value of $1$ means that it is not.

If halting is not appropriate, the value $\mathrm{-1}$ or $1$ is recommended. If message printing is undesirable, then the value $1$ is recommended. Otherwise, the value $0$ is recommended. When the value $-\mathbf{1}$ 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, $\mathbf{m}=⟨\mathit{\text{value}}⟩$, $\mathbf{n}=⟨\mathit{\text{value}}⟩$ and $\mathbf{mn}=⟨\mathit{\text{value}}⟩$.
Constraint: $\mathbf{mn}=\mathbf{m}\times \mathbf{n}$.

$\mathbf{ifail}=2$

On entry, $\mathbf{lmove}=⟨\mathit{\text{value}}⟩$.
Constraint: $\mathbf{lmove}>0$.

$\mathbf{ifail}<0$

A serious internal error has occurred in f01crf.

$\mathbf{ifail}=-99$

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

10 Example

10.1 Program Text

10.2 Program Data

10.3 Program Results