NAG Library Routine Document

s30qcf (opt_amer_bs_price)

1

Purpose

2

Specification

3

Description

4

References

5

Arguments

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

On entry: determines whether the option is a call or a put.

$\mathbf{calput}=\text{'C'}$

A call; the holder has a right to buy.

$\mathbf{calput}=\text{'P'}$

A put; the holder has a right to sell.

Constraint: $\mathbf{calput}=\text{'C'}$ or $\text{'P'}$.

2:     $\mathbf{m}$ – IntegerInput

On entry: the number of strike prices to be used.

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

3:     $\mathbf{n}$ – IntegerInput

On entry: the number of times to expiry to be used.

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

4:     $\mathbf{x}\left(\mathbf{m}\right)$ – Real (Kind=nag_wp) arrayInput

On entry: $\mathbf{x}\left(i\right)$ must contain $X_{\mathit{i}}$, the $\mathit{i}$th strike price, for $\mathit{i}=1,2,\dots ,\mathbf{m}$.

Constraint: $\mathbf{x}\left(\mathit{i}\right)\ge z\text{ and }\mathbf{x}\left(\mathit{i}\right)\le 1/z$, where $z=\mathbf{x02amf}\left(\right)$, the safe range parameter, for $\mathit{i}=1,2,\dots ,\mathbf{m}$.

5:     $\mathbf{s}$ – Real (Kind=nag_wp)Input

On entry: $S$, the price of the underlying asset.

Constraint: $\mathbf{s}\ge z\text{ and }\mathbf{s}\le \frac{1}{z}$, where $z=\mathbf{x02amf}\left(\right)$, the safe range parameter and ${\mathbf{s}}^{\beta }<\frac{1}{z}$ where $\beta$ is as defined in Section 3.

6:     $\mathbf{t}\left(\mathbf{n}\right)$ – Real (Kind=nag_wp) arrayInput

On entry: $\mathbf{t}\left(i\right)$ must contain $T_{\mathit{i}}$, the $\mathit{i}$th time, in years, to expiry, for $\mathit{i}=1,2,\dots ,\mathbf{n}$.

Constraint: $\mathbf{t}\left(\mathit{i}\right)\ge z$, where $z=\mathbf{x02amf}\left(\right)$, the safe range parameter, for $\mathit{i}=1,2,\dots ,\mathbf{n}$.

7:     $\mathbf{sigma}$ – Real (Kind=nag_wp)Input

On entry: $\sigma$, the volatility of the underlying asset. Note that a rate of 15% should be entered as $0.15$.

Constraint: $\mathbf{sigma}>0.0$.

8:     $\mathbf{r}$ – Real (Kind=nag_wp)Input

On entry: $r$, the annual risk-free interest rate, continuously compounded. Note that a rate of 5% should be entered as $0.05$.

Constraint: $\mathbf{r}\ge 0.0$.

9:     $\mathbf{q}$ – Real (Kind=nag_wp)Input

On entry: $q$, the annual continuous yield rate. Note that a rate of 8% should be entered as $0.08$.

Constraint: $\mathbf{q}\ge 0.0$.

10:   $\mathbf{p}\left(\mathbf{ldp},\mathbf{n}\right)$ – Real (Kind=nag_wp) arrayOutput

On exit: $\mathbf{p}\left(i,j\right)$ contains $P_{ij}$, the option price evaluated for the strike price ${\mathbf{x}}_i$ at expiry ${\mathbf{t}}_j$ for $i=1,2,\dots ,\mathbf{m}$ and $j=1,2,\dots ,\mathbf{n}$.

11:   $\mathbf{ldp}$ – IntegerInput

On entry: the first dimension of the array p as declared in the (sub)program from which s30qcf is called.

Constraint: $\mathbf{ldp}\ge \mathbf{m}$.

12:   $\mathbf{ifail}$ – IntegerInput/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 3.4 in How to Use the NAG Library and its Documentation 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, $\mathbf{calput}=〈\mathit{\text{value}}〉$ was an illegal value.

$\mathbf{ifail}=2$

On entry, $\mathbf{m}=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{m}\ge 1$.

$\mathbf{ifail}=3$

On entry, $\mathbf{n}=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{n}\ge 1$.

$\mathbf{ifail}=4$

On entry, $\mathbf{x}\left(〈\mathit{\text{value}}〉\right)=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{x}\left(i\right)\ge 〈\mathit{\text{value}}〉$ and $\mathbf{x}\left(i\right)\le 〈\mathit{\text{value}}〉$.

$\mathbf{ifail}=5$

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

$\mathbf{ifail}=6$

On entry, $\mathbf{t}\left(〈\mathit{\text{value}}〉\right)=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{t}\left(i\right)\ge 〈\mathit{\text{value}}〉$.

$\mathbf{ifail}=7$

On entry, $\mathbf{sigma}=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{sigma}>0.0$.

$\mathbf{ifail}=8$

On entry, $\mathbf{r}=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{r}\ge 0.0$.

$\mathbf{ifail}=9$

On entry, $\mathbf{q}=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{q}\ge 0.0$.

$\mathbf{ifail}=11$

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

$\mathbf{ifail}=14$

On entry, $\mathbf{s}=〈\mathit{\text{value}}〉$ and $\beta =〈\mathit{\text{value}}〉$.
Constraint: ${\mathbf{s}}^{\beta }<〈\mathit{\text{value}}〉$.

$\mathbf{ifail}=-99$

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

See Section 3.9 in How to Use the NAG Library and its Documentation for further information.

$\mathbf{ifail}=-399$

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

See Section 3.8 in How to Use the NAG Library and its Documentation for further information.

$\mathbf{ifail}=-999$

Dynamic memory allocation failed.

See Section 3.7 in How to Use the NAG Library and its Documentation for further information.

7

Accuracy

8

Parallelism and Performance

9

Further Comments

10

Example

10.1

Program Text

Program Text (s30qcfe.f90)

10.2

Program Data

Program Data (s30qcfe.d)

10.3

Program Results

Program Results (s30qcfe.r)