MATLAB POLYSPACE RELEASE NOTES Instrukcja Użytkownika Pobierz pdf (Strona 166)

4 Programming

s = ['August' int2str(d) '.dat'];

load(s)

% Code to proc ess the contents of the d-th file

end

The eval Function

The eval function works with text v ariables to implement a powerful text

macro facility. The expression or statement

eval(s)

uses the MATLAB interpreter to e valuate the expre ssion or execute the

statement contained in the text string

Theexampleoftheprevioussectioncouldalsobedonewiththefollowing

code, al though this would b e somewhat less efficient be c au se it in volves the

full interpreter, not just a function call:

ford=1:31

s = ['load August' int2str(d) '.dat'];

eval(s)

% Process the contents of the d-th file

end

Function Handles

You can create a handle to any MATLAB function and then use that handle

as a means of referencing the function. A function handle is typically passed

in an argum ent list to other functions, w hich can then execute, or evaluate,

the function using the handle.

Construct a function handle in MATLAB using the at sign,

@,beforethe

function name. The following example creates a function handle for the

sin

function and assigns it to the variable fhandle:

fhandle = @sin;

You can call a function by means of its handle in the same way that you would

call the function using its name. The syntax is

fhandle(arg1, arg2, ...);

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MATLAB POLYSPACE RELEASE NOTES Instrukcja Użytkownika Strona 166