fft

[Diego Alberto Arias Prado]

        Hello!
        There is something in the fft() function that I don't understand. I
compute the fft of a vector containing the samples of a sinc(), an exp() and
a rectangular pulse and what I get is a vector of the same size. What I
don't understand is this: in the positions 1, 2, 4.. and N-3, N-2, N-1 and N
of the vector (its size is 1 N) I get "big" values and in the central
positions the values (I mean, far from 1 and N) I get values near to cero.
        Thus, from transforming a sinc() I get something that hasn't
anything to see with a rectangular pulse (for example). HELP!
        Thanks in advance.

address@hidden
...elementary penguin singing Hare Krishna...

                                        A UNIX saleslady, Lenore
                                        Enjoys work but she likes the beach more
                                        She found a good way
                                        To combine work and play:
                                        She sells C shells by the seashore.