How do I plot the impulse response from this equation?

I have been given an exercise to plot this equation h = h[1] = 1, h[2] = 3, h[3] = -2, h[4] = 9, h[5] = 7; I am very new to Matlab and I am confused as to whether I have to define some of the variables or simply just insert the equation? Sorry I cannot provide much more information I am a Matlab novice.

Answer 1

[Jan]

Maybe you want to do something like:

 h = [1, 3, -2, 9, 7]; 

 ft_h = fft( h ); 

 ft_h = sqrt( ft_h .* conj( ft_h ) );

 plot( ft_h );

Answer 2

[Youssef Khmou]

try :

 n=500;
 [g,w]=freqz(h,n);
  figure,plot(w,(abs(g)))