undefined function or variable 'sigshift'

clear all
close all
clc

% noise sequence 1
x = [3,11,7,0,-1,4,2]; nx = [-3,3];
[y,ny] = sigshift(x,nx,2);
w = randn(1,length(y)); nw = ny;
[y,ny] = sigadd(y,ny,w,nw);
[x,nx] = sigfold(x,nx);
[rxy,nrxy] = conv_m(y,ny,x,nx);
subplot(1,1,1),subplot(2,1,1);stem(nrxy,rxy)
axis([-5,10,-50,50]); xlabel('lag variable 1')
ylabel('rxy'); title('Crosscorrelation: Noise sequence 1')

Answer 1

[Ameer Hamza]

As mentioned in Walter's answer here: https://www.mathworks.com/matlabcentral/answers/268957-undefined-function-or-variable-sigshift-how-can-i-shift-the-signal, sigshift is a function inside the FEX package: https://www.mathworks.com/matlabcentral/fileexchange/2189-digital-signal-processing-using-matlab. It does not come with MATLAB by default. Download the FEX package and place it on your MATLAB's path. Then you will be able to use the function.