why doesn't the function sigshift work when i use it for x(n) = 2x(n - 5) - 3x (n + 4).

n = -2:10; x = [1:7,6:-1:1]; [x11,n11] = sigshift(r,n,5); [x12,n12] = sigshift(x,n,-4); [xl,nl] = sigadd(2*x11,n11,-3*x12,n12); stem(n1,x1); grid;

it shows: Undefined function 'sigshift' for input arguments of type 'double'.

Answer 1

[Niels]

Your function sigshift seems not to be a built-in function. Are you sure the function/directory it is located in is included in your work path?

Answer 2

[dato datuashvili]

locate this code in the same directory

function [y,n] = sigshift(x,m,n0)

% implements y(n) = x(n-n0)

% -------------------------

% [y,n] = sigshift(x,m,n0)

%

n = m+n0; y = x;

in other word create script with name same as sigshift and locate this script in the same directory where variables are declared