MATLAB FINANCIAL DERIVATIVES TOOLBOX Uživatelský manuál stáhnout pdf (Strana 36)

and a Not-a-Number,

, is returned in the vector. In the third

case, the inverse of each vector element is required, but Matlab

returns an error since for such operation the “./” and not “/”

should have been used instead.

Example: Examine the following limit:

lim

−

∞→

−

Matlab’s command:

>>x=[0.5 1 5 25 50 100 300];

>>(exp(x)-exp(-x))./(exp(x)+exp(-x))

Matlab’s response:

ans =

0.4621 0.7616 0.9999 1.0000 1.0000 1.0000 1.0000

Comments:

Apparently, the limit converges to unity.

The dot power of vectors works in a similar way as with other dot products.

Usually there is the need to square (or to rise to some other power) the

elements of a vector. This can be done with the dot power operation as

explained in the following example set.

Matlab’s command:

>> d_power=sqrt(0:log(3):6)

>> d_power.^2, d_power.^4, d_power.* d_power, ans.*ans

Matlab’s response:

d_power =

0 1.0481 1.4823 1.8154 2.0963 2.3437

ans =

0 1.0986 2.1972 3.2958 4.3944 5.4931

ans =

0 1.2069 4.8278 10.8625 19.3112 30.1737

ans =

0 1.0986 2.1972 3.2958 4.3944 5.4931

ans =

0 1.2069 4.8278 10.8625 19.3112 30.1737

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 118 119

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MATLAB FINANCIAL DERIVATIVES TOOLBOX Uživatelský manuál Strana 36