How to solve this problem?

??? Input argument "n" is undefined.

Error in ==> Impulse at 3
h=zeros(1, length(n));

My program is

function h=dd1(n)
N=10;
h=zeros(1, length(n));
h(n==0) = 1;
n=0:N-1;
h(n)=dd1(n-3)-2.7083*dd1(n-4)+4.1861*dd1(n-5)-3.0451*dd1(n-6)+0.73071*dd1(n-7);
stem(n, h)
xlabel('n')
ylabel('Impulse Function')

Please help me. Thank you.

[Stephen23]

Please show us how you are calling your function dd1.

Answer 1

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/276179#comment_354408