How to plot frequency response in matlab

Hi. I have the following assignment, but I can't figure out how to plot it in matlab.

A linear time-invariant filter is described by the difference equation y[n] = x[n] - x[n-2]. Obtain an expression for the frequency response of this system: H(e^(j*w)=1-e^((-2)*j*w).

Sketch the frequency respons (magnitude and phase) as a function of frequency. - I would like to do this in matlab. Is it possible?

[Arnaud Miege]

Yes. What have you done so far?

Answer 1

[Ivan van der Kroon]

you could get familiar with the wintool and wvtool gui's. I think these tools are really straight forward. Good luck!