NAG CL Interface
s30bac (opt_​lookback_​fls_​price)

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1 Purpose

s30bac computes the price of a floating-strike lookback option.

2 Specification

#include <nag.h>
void  s30bac (Nag_OrderType order, Nag_CallPut option, Integer m, Integer n, const double sm[], double s, const double t[], double sigma, double r, double q, double p[], NagError *fail)
The function may be called by the names: s30bac, nag_specfun_opt_lookback_fls_price or nag_lookback_fls_price.

3 Description

s30bac computes the price of a floating-strike lookback call or put option. A call option of this type confers the right to buy the underlying asset at the lowest price, Smin, observed during the lifetime of the contract. A put option gives the holder the right to sell the underlying asset at the maximum price, Smax, observed during the lifetime of the contract. Thus, at expiry, the payoff for a call option is S-Smin, and for a put, Smax-S.
For a given minimum value the price of a floating-strike lookback call with underlying asset price, S, and time to expiry, T, is
Pcall = S e-qT Φ(a1) - Smin e-rT Φ(a2) + S e-rT   σ2 2b [ ( S Smin ) -2b / σ2 Φ(-a1+ 2b σ T) -e bT Φ(-a1)] ,  
where b=r-q0. The volatility, σ, risk-free interest rate, r, and annualised dividend yield, q, are constants. When r=q, the option price is given by
Pcall = S e-qT Φ (a1) - Smin e-rT Φ (a2) + S e-rT σT [ϕ(a1)+a1(Φ(a1)-1)] .  
The corresponding put price is (for b0),
Pput = Smax e-rT Φ (-a2) - S e-qT Φ (-a1) + S e-rT   σ2 2b [- ( S Smax ) -2b / σ2 Φ(a1- 2b σ T)+ebTΦ(a1)] .  
When r=q,
Pput = Smax e-rT Φ (-a2) - S e-qT Φ (-a1) + S e-rT σT [ϕ(a1)+a1Φ(a1)] .  
In the above, Φ denotes the cumulative Normal distribution function,
Φ(x) = - x ϕ(y) dy  
where ϕ denotes the standard Normal probability density function
ϕ(y) = 12π exp(-y2/2)  
and
a1 = ln (S/Sm) + (b+σ2/2) T σT a2=a1-σT  
where Sm is taken to be the minimum price attained by the underlying asset, Smin, for a call and the maximum price, Smax, for a put.
The option price Pij=P(X=Xi,T=Tj) is computed for each minimum or maximum observed price in a set Smin (i) or Smax (i) , i=1,2,,m, and for each expiry time in a set Tj, j=1,2,,n.

4 References

Goldman B M, Sosin H B and Gatto M A (1979) Path dependent options: buy at the low, sell at the high Journal of Finance 34 1111–1127

5 Arguments

1: order Nag_OrderType Input
On entry: the order argument specifies the two-dimensional storage scheme being used, i.e., row-major ordering or column-major ordering. C language defined storage is specified by order=Nag_RowMajor. See Section 3.1.3 in the Introduction to the NAG Library CL Interface for a more detailed explanation of the use of this argument.
Constraint: order=Nag_RowMajor or Nag_ColMajor.
2: option Nag_CallPut Input
On entry: determines whether the option is a call or a put.
option=Nag_Call
A call; the holder has a right to buy.
option=Nag_Put
A put; the holder has a right to sell.
Constraint: option=Nag_Call or Nag_Put.
3: m Integer Input
On entry: the number of minimum or maximum prices to be used.
Constraint: m1.
4: n Integer Input
On entry: the number of times to expiry to be used.
Constraint: n1.
5: sm[m] const double Input
On entry: sm[i-1] must contain Smin (i) , the ith minimum observed price of the underlying asset when option=Nag_Call, or Smax (i) , the maximum observed price when option=Nag_Put, for i=1,2,,m.
Constraints:
  • sm[i-1]z ​ and ​ sm[i-1] 1 / z , where z = nag_real_safe_small_number , the safe range parameter, for i=1,2,,m;
  • if option=Nag_Call, sm[i-1]S, for i=1,2,,m;
  • if option=Nag_Put, sm[i-1]S, for i=1,2,,m.
6: s double Input
On entry: S, the price of the underlying asset.
Constraint: sz ​ and ​s1.0/z, where z=nag_real_safe_small_number, the safe range parameter.
7: t[n] const double Input
On entry: t[i-1] must contain Ti, the ith time, in years, to expiry, for i=1,2,,n.
Constraint: t[i-1]z, where z = nag_real_safe_small_number , the safe range parameter, for i=1,2,,n.
8: sigma double Input
On entry: σ, the volatility of the underlying asset. Note that a rate of 15% should be entered as 0.15.
Constraint: sigma>0.0.
9: r double 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: r0.0.
10: q double Input
On entry: q, the annual continuous yield rate. Note that a rate of 8% should be entered as 0.08.
Constraint: q0.0.
11: p[m×n] double Output
Note: where P(i,j) appears in this document, it refers to the array element
  • p[(j-1)×m+i-1] when order=Nag_ColMajor;
  • p[(i-1)×n+j-1] when order=Nag_RowMajor.
On exit: P(i,j) contains Pij, the option price evaluated for the minimum or maximum observed price Smin (i) or Smax (i) at expiry tj for i=1,2,,m and j=1,2,,n.
12: fail NagError * Input/Output
The NAG error argument (see Section 7 in the Introduction to the NAG Library CL Interface).

6 Error Indicators and Warnings

NE_ALLOC_FAIL
Dynamic memory allocation failed.
See Section 3.1.2 in the Introduction to the NAG Library CL Interface for further information.
NE_BAD_PARAM
On entry, argument value had an illegal value.
NE_INT
On entry, m=value.
Constraint: m1.
On entry, n=value.
Constraint: n1.
NE_INTERNAL_ERROR
An internal error has occurred in this function. Check the function call and any array sizes. If the call is correct then please contact NAG for assistance.
See Section 7.5 in the Introduction to the NAG Library CL Interface for further information.
NE_NO_LICENCE
Your licence key may have expired or may not have been installed correctly.
See Section 8 in the Introduction to the NAG Library CL Interface for further information.
NE_REAL
On entry, q=value.
Constraint: q0.0.
On entry, r=value.
Constraint: r0.0.
On entry, s=value.
Constraint: svalue and svalue.
On entry, sigma=value.
Constraint: sigma>0.0.
NE_REAL_ARRAY
On entry, sm[value]=value.
Constraint: valuesm[i]value for all i.
On entry, t[value]=value.
Constraint: t[i]value for all i.
On entry with a call option, sm[value]=value.
Constraint: for call options, sm[i]value for all i.
On entry with a put option, sm[value]=value.
Constraint: for put options, sm[i]value for all i.

7 Accuracy

The accuracy of the output is dependent on the accuracy of the cumulative Normal distribution function, Φ. This is evaluated using a rational Chebyshev expansion, chosen so that the maximum relative error in the expansion is of the order of the machine precision (see s15abc and s15adc). An accuracy close to machine precision can generally be expected.

8 Parallelism and Performance

s30bac is threaded by NAG for parallel execution in multithreaded implementations of the NAG Library.
Please consult the X06 Chapter Introduction for information on how to control and interrogate the OpenMP environment used within this function. Please also consult the Users' Note for your implementation for any additional implementation-specific information.

9 Further Comments

None.

10 Example

This example computes the price of a floating-strike lookback call with a time to expiry of 6 months and a stock price of 120. The minimum price observed so far is 100. The risk-free interest rate is 10% per year and the volatility is 30% per year with an annual dividend return of 6%.

10.1 Program Text

Program Text (s30bace.c)

10.2 Program Data

Program Data (s30bace.d)

10.3 Program Results

Program Results (s30bace.r)