How to make a function defined at discrete points?

x[n] = { 1 if n=0,

2 if n=1,

3 if n=2,

2 if n=5,

2 if n=6,

0 otherwise }

Answer 1

[Star Strider]

One possibility:

xn = @(n) [(n==0) (n==1) (n==2) (n==5) (n==6)]*[1; 2; 3; 2; 2];

y = xn(2)

y =
     3