Shifting a signal to the right or left

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SSG_newbiecoder
SSG_newbiecoder on 1 Feb 2018
Commented: Shukumar Pattnaik on 10 Feb 2021
How can I shift a signal to the left or right? Is there any inbuilt command for it?
  6 Comments
Sk Group
Sk Group on 24 Jan 2021
https://www.swebllc.com/signal-shift-function-in-matlab/

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Answers (6)

Jos (10584)
Jos (10584) on 20 Sep 2019
x = 1:5
shift = 3
x = circshift(x,shift)
N = numel(x)
ix = (1:N) - shift
tf = ix < 1 | ix > N
x(tf) = 0

Jos (10584)
Jos (10584) on 1 Feb 2018
x = 1:10
k = 3
xs = circshift(x,k)

SSG_newbiecoder
SSG_newbiecoder on 20 Sep 2019
I'll try to explain with an example.
Let X={1 2 3 4 5} be our sequence. s = zeros(size(X))
s={0 0 0 0 0}
Right shift
If we want to shift this function to the right by three points,
shift=3 i.e, shift>0
s(shift+1:end) = x(1:end-shift)
ie, s(4,5)=X(1,2)
so shifted output will be s={0 0 0 1 2}
Left shift
If we want to shift this function to the left by three points,
shift=-3 i.e, shift<0
s(1:end+shift) = x(-shift+1:end)
ie, s(1,2)=X(4,5)
so shifted output will be s={4 5 0 0 0}
Hope this makes sense. Please note that this is not the circular shift and we have inbuilt code for circular shift.

Manoj Kumar Koduru
Manoj Kumar Koduru on 23 Nov 2020
clc;
close all;
L=input ('Enter the no.: ');
n=-L:L;
y=[zeros(1,L),1,zeros(1,L)];
if n >0
y(L+1:end) = n(1:end-L);
elseif n <0
y(1:end+L) = n(-L+1:end);
end
y
plot(n,y);

Sk Group
Sk Group on 8 Feb 2021
MATLAB CODE:
function [n1,x1] = sigshift(x,n,k)
n = 1:10;
k = 2;
x = exp(n);
if k>0
disp(‘Positive’);
n1 = n(1):n(end)+k;
x1 = [zeros(1,k) x];
else
disp(‘Negative’);
n1 = n(1)+k:n(end);
x1 = [x zeros(1,abs(k))]; % abs is for absolute value of (k) because quantity can never be (-ve) negative %
end

Sk Group
Sk Group on 8 Feb 2021
MATLAB CODE:
function [n1,x1] = sigshift(x,n,k)
n = 1:10;
k = 2;
x = exp(n);
if k>0
disp(‘Positive’);
n1 = n(1):n(end)+k;
x1 = [zeros(1,k) x];
else
disp(‘Negative’);
n1 = n(1)+k:n(end);
x1 = [x zeros(1,abs(k))]; % abs is for absolute value of (k) because quantity can never be (-ve) negative %
end
MATLAB CODE:
function [y n1] = sigfold(x,n)
n1 = -fliplr(n)
y = fliplr(x)
end

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