MATLAB FINANCIAL DERIVATIVES TOOLBOX Uživatelský manuál stáhnout pdf (Strana 48)

Col =

ans =

39 -310

297 314

Comments:

Matrix-vector and matrix-matrix products.

2.1.5 Special Cases of Matrices

Matlab has some very useful build-in matrices functions that ease the

manipulation of two dimensional arrays. These functions usually take as

input (at least) the matrix dimension and return a certain result. Table 3

exhibits these very useful functions accompanied with a short explanation of

their use.

e(m,n)

In the case where m is equal to n this returns an identity

matrix

s(m,n)

Creates an m-by-n matrix of ones

g(V)

When V is a m-by-m matrix returns the elements of the main

diagonal.

d(m,n)

Creates an m-by-n matrix with random entries

s(m,n)

Creates an m-by-n matrix of zeros

Table 3: Various functions that can be used with vectors.

Examples with the above matrix-functions follow:

Matlab’s command:

>> eye(3,2), ones(2,3), diag([2 3; 1 -2]), rand(2,2), zeros(1,2)

Matlab’s response:

ans =

1 0

0 1

0 0

ans =

1 1 1

ans =

-2

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 118 119

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MATLAB FINANCIAL DERIVATIVES TOOLBOX Uživatelský manuál Strana 48