Re: vectorize inline function

[isotrex]

here's the error:

octave-3.6.4.exe:15> secant
Enter Function:x^2*cos(x)-1
error: isinf: not defined for inline function
error: evaluating argument list element number 1
error: evaluating argument list element number 1
error: called from:
error:  
D:\Software\Octave-3.6.4\share\octave\3.6.4\m\plot\private\__plt__.m at
 line 219, column 3
error:  
D:\Software\Octave-3.6.4\share\octave\3.6.4\m\plot\private\__plt__.m at
 line 99, column 17
error:   D:\Software\Octave-3.6.4\share\octave\3.6.4\m\plot\plot.m at line
196,
column 9
error:   D:\Software\Octave-3.6.4\numericals\secant.m at line 11, column 2
octave-3.6.4.exe:15>

here's my code:

function ret = secant()
        a = input('Enter Function:','s');
        f = inline(a);

        t=-5:0.0001:3;
        #x = t.^2.*cos(t)-1; #<--- this works. just commented it out to try 
between
the two.
        x = vectorize(f);       #<---- this code does not
        plot(t,x);
        axis([-6 4 -15 15])
        title('Plot of f(x)=x^2*cos(x)-1')
        xlabel('time(t)')
        ylabel('f(x)')
        grid on
endfunction

I maybe missing something here. I don't know what isinf error either and
according to the manual...
isinf (x) [Mapping Function]
Return a logical array which is true where the elements of x are are
infinite and false
where they are not. For example:
isinf ([13, Inf, NA, NaN])

Also, is there a comment block for octave. It seems %{ %} or #{ #} doesn't
work. I'm using Octave 3.6.4 by the way. Thanks for taking your time in
helping me. 



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