Is it correct? (dirac delta function)

Hi. I want to stem this function,

and this is my code.

i wonder it is correct.

Answer 1

[Walter Roberson]

no it should be 2*(n==0)

However there is another sense in which dirac(x) should be infinite when x is 0 instead being 1.

Answer 2

[Ameer Hamza]

You code is correct. Another way is to use built-in kroneckerDelta function.

n = sym(-5:5);
xn = kroneckerDelta(n,-2) - 2*kroneckerDelta(n,0) + kroneckerDelta(n,2);
stem(n, xn, 'b', 'filled')
axis([-10 10 -5 5])