RE: New to Octave

[Neil.Francis]

>  octave-3.0.5:2> dt = 1/100;
>  octave-3.0.5:3> tt = -1 : dt : 1;
>  octave-3.0.5:4> Fo = 2;
>  octave-3.0.5:5> xx = 300*real( exp( j*(2*pi*Fo(tt - 0.75) ) ) );
>  error: expecting integer index, found -1.750000

In your line 5 you appear to be trying to index a vector called "Fo".  The 
result of (tt - 0.75) is not an integer and can't be used as an index to "Fo".  

As Fo isn't a vector, maybe you wanted to instead write "Fo*(tt - 0.75)" there?

Neil