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

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Blasphemy
Blasphemy 2015-1-30
编辑： dato datuashvili 2015-2-2
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'.

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回答（2 个）

Niels
Niels 2015-1-30
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?
dato datuashvili
dato datuashvili 2015-2-2
编辑：dato datuashvili 2015-2-2
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

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