Section: Flow Control
error function causes an error condition (exception
to be raised). The general syntax for its use is
error(s),
where s is the string message describing the error. The
error function is usually used in conjunction with try
and catch to provide error handling. If the string s,
then (to conform to the MATLAB API), error does nothing.
error being issued by a function
evenoddtest:
evenoddtest.m
function evenoddtest(n)
if (n==0)
error('zero is neither even nor odd');
elseif ( n ~= fix(n) )
error('expecting integer argument');
end;
if (n==int32(n/2)*2)
printf('%d is even\n',n);
else
printf('%d is odd\n',n);
end
The normal command line prompt --> simply prints the error
that occured.
--> evenoddtest(4)
4 is even
--> evenoddtest(5)
5 is odd
--> evenoddtest(0)
In /home/basu/dev/branches/FreeMat4/help/tmp/evenoddtest.m(evenoddtest) at line 3
In scratch() at line 1
In base(base)
In base()
In global()
Error: zero is neither even nor odd
--> evenoddtest(pi)
In /home/basu/dev/branches/FreeMat4/help/tmp/evenoddtest.m(evenoddtest) at line 5
In scratch() at line 1
In base(base)
In base()
In global()
Error: expecting integer argument