NAG Library Routine Document

F16JNF (BLAS_DMAX_VAL)

1  Purpose

2  Specification

3  Description

4  References

5  Parameters

1:     N – INTEGERInput

On entry: $n$, the number of elements in $x$.

2:     X($1+\left(\mathbf{N}-1\right)\times \left|\mathbf{INCX}\right|$) – REAL (KIND=nag_wp) arrayInput

On entry: the vector $x$. Element $x_{\mathit{i}}$ is stored in $\mathbf{X}\left(\left(\mathit{i}-1\right)\times \left|\mathbf{INCX}\right|+1\right)$, for $\mathit{i}=1,2,\dots ,n$.

3:     INCX – INTEGERInput

On entry: the increment in the subscripts of X between successive elements of $x$.

Constraint: $\mathbf{INCX}\ne 0$.

4:     K – INTEGEROutput

On exit: $k$, the index, from the set $\left\{1,1+\left|\mathbf{INCX}\right|,\dots ,1+\left(\mathbf{N}-1\right)\times \left|\mathbf{INCX}\right|\right\}$, of the largest component of $x$. If $\mathbf{N}\le 0$ on input then K is returned as $0$.

5:     R – REAL (KIND=nag_wp)Output

On exit: $r$, the largest component of $x$. If $\mathbf{N}\le 0$ on input then R is returned as $0.0$.

6  Error Indicators and Warnings

7  Accuracy

8  Further Comments

9  Example

9.1  Program Text

Program Text (f16jnfe.f90)

9.2  Program Data

Program Data (f16jnfe.d)

9.3  Program Results

Program Results (f16jnfe.r)