How can I compare vectors using if statement?

Let's say I have vectors,

1. T (1 x 513) 2. F (1 x 30) 3. S (513 x 30)

As you see, T is time, F is frequency and S is output of short time fourier transform using the T and F.

S(i,j) represents the amplitude of the signal at 'i'th element of time and 'j'th element of frequency.

What I'm going to do is like below.

            Let T(j)=1
            case X1<F(i)<Y1
                 if S(i,j)>100
                    return A;
            case X2<F(i)<Y1
                 if S(i,j)>100
                    return B;
            otherwise
                    return C;

I already have STFT function.

But problem is, I don't know how to make this case and if statement using matlab.

plz help me.

[M]

Did you read this ?

[minsoo kim]

ah......thx! haha...