MATLAB FINANCIAL DERIVATIVES TOOLBOX Instrukcja Użytkownika Pobierz pdf (Strona 78)

Fifth Section

5. m-files: Scripts and Functions

Up to this point, all commands passed to Matlab, were done through the

command window. But when a segment of programming code is composed

from several different commands, then it is time consuming, inefficient and

quite difficult to continue using the command window. To alleviate this

peculiarity, Matlab allows for the creation of functions and scripts by using

an Editor/Debugger that looks like a text editor.

As said, functions and scripts can be created with the use of the Matlab’s

Editor/Debugger. You only have to write the command lines, save the file in

a directory of your choice and execute it by typing its name to the command

window and pressing [Enter] (you have to make sure that the Matlab’s

current directory and the directory in which you save the file are the same).

Although m-files represent a text file and it is possible to use any text editor

to create a function or a script (as long as the extension of the file is *.m this

can work), it is preferable to use the default editor because: i) when you save

a file it automatically takes the extension *.m, ii) the reserved words like:

d etc are blue colored whilst comments that make the

programming code more readable are green colored, and iii) it automatically

communicates with the command window and allows to run a script via a

command found in the Debug menu (see the menu bar of Editor/Debugger).

5.1 m-files: Functions

Functions are m-files that can accept input arguments and return output

arguments. The name of the m-file and of the

n should be the same.

Functions operate on variables within their own workspace, separate from

the workspace you access at the Matlab command prompt. Functions are

useful for extending the existing Matlab language for personal applications

For example a practitioner might want to write various functions that return

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MATLAB FINANCIAL DERIVATIVES TOOLBOX Instrukcja Użytkownika Strona 78