MATLAB FINANCIAL DERIVATIVES TOOLBOX Manual de usuario descargar pdf (Pagina 83)

5.1.1.4 The Body Text

The function body contains all the Matlab code that performs computations

and assigns values to output arguments. The statements in the function

body can consist of function calls, programming constructs like flow control

and interactive input/output, calculations, assignments, comments, and

blank lines.

For example, the body of the

t function contains a number of

simple programming statements:

“% Author: Panayiotis Andreou, Sept. 2003

% This function uses the error build-in function that displays a message

% and aborts the function's execution

[m n]=size(X); %Saving the size of the matrix

if isempty(X) %Checking if it is an empty matrix

error('You have not passed a square matrix');

elseif (m~=n) %Checking if matrix is square

error('You have enter a non square matrix');

elseif (m==n & m==1) %Checking if it is a single value

error('You have enter a single value');

else

Ind=(1:n:n^2)+(0:n-1); %Finding the indeces of the diagonal elements

V=X(Ind); %Extracting to V the diagonal elements

end ”

5.2 Scripts

On the other hand, scripts can operate on existing data in the workspace, or

they can create new data on which to operate. Although scripts do not

return output arguments, any variables that they create remain in the

workspace, to be used in subsequent computations. In addition, scripts can

produce graphical output using functions. Scripts are useful for automating a

series of steps that are needed to be performed many times (e.g. to create a

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MATLAB FINANCIAL DERIVATIVES TOOLBOX Manual de usuario Pagina 83