MATLAB FINANCIAL DERIVATIVES TOOLBOX Uživatelský manuál stáhnout pdf (Strana 42)

in the workspace; use the

o function to view the variables that you have

saved in the workspace or view them from the workspace browser):

Matlab’s command:

>> A(1,2), A(2,3), A(2,4)

Matlab’s response:

ans =

-2

ans =

Comments:

Extracting specific elements from a matrix.

So, in Matlab, to refer to a certain matrix element, after the matrix name the

element’s index/position is enclosed in parenthesis. This is similar with the

indexing of vectors elements with the exception that in the case of matrices,

two indexes should be used (the first one indicates the row number whilst

the second the column number). In general, the syntax for manipulating a

matrix element in Matlab is:

“K(row_index, column_index)”

where

K is an

matrix, row_index indicates the row in which an

element lays and column_index the according column. The upper left

position in a matrix has (1,1) coordinates. row_index can take all integer

values smaller than m, inclusive, while column_index can also take all

integer values smaller than n, inclusive (note that Matlab can handle

multidimensional arrays just by putting additional indexes to control the

higher dimensions).

Moreover, Matlab has an additional way to refer to matrix elements just by

using a single index number in the brackets after the declaration of the

matrix name. Starting from the upper left element that represents the first

element (1)of the matrix, further reference to additional elements is done

incrementally one by one and column-wise. That is, the element with

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 118 119

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MATLAB FINANCIAL DERIVATIVES TOOLBOX Uživatelský manuál Strana 42