MATLAB FINANCIAL DERIVATIVES TOOLBOX Instrukcja Użytkownika Pobierz pdf (Strona 80)

error); you have to return to the Editor to debug the error, re-save the

function and try to run it again. If you debug your function or add something,

then you have to re-save the file in order to take place the changes (note that

if unsaved changes are made in a function file, an asterisk (*) appears next

to the function name in the Editor’s title bar (so in Figure 12, the functions

has not been saved); ii) although the input argument of the function is a

matrix named

X and the output is a vector named

V, when you call this

function from a script or from the command window, you can give any names

you like. For example in the command window enter:

“[DiagElements]=DiagExtract(magic(4))”

to see the result; iii) After the function is executed, none of the variables that

were used are saved in the workspace; iv) If after each command line you do

not place the semi-colon “;” then when the function is executed, you can

observe in the command window the result of these command lines (this is

useful to be done when you try to debug a function); v) observe on Figure 12

that on the bottom of the Editor/Debugger there is a predefined caption area

that indicates that the current m-file is a function with the name

5.1.1 Basic Parts of a Function

A function is composed from the following parts (most of this section is

taken/copied from [2])

5.1.1.1 Function Definition Line

The

n definition line informs Matlab that the m-file contains a

n, and specifies the argument calling sequence of the function. For

example, the

n definition line for the

e function (that computes

the average of a vector) could be:

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 118 119

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MATLAB FINANCIAL DERIVATIVES TOOLBOX Instrukcja Użytkownika Strona 80