Shifting a signal to the right or left

How can I shift a signal to the left or right? Is there any inbuilt command for it?

[Adam]

A signal defined how? Usually you will have t (time) data and y data for a signal. You can just change the t data to shift it.

[SSG_newbiecoder]

I have a signal x[n] I need to shift it to the right by k. Is there any inbuilt commands or do I have to write the code for it?

[Jos (10584)]

maybe you should give an example of the input and expected output?

[SSG_newbiecoder]

The below code works well so problem solved. :)

 s = zeros(size(x));
if shift >0
  s(shift+1:end) = x(1:end-shift);
elseif shift <0
  s(1:end+shift) = x(-shift+1:end);
end

[mathematics]

Dear SSG_newbiecoder

Could you please explain how to use this code?

Thank you

[Sk Group]

https://www.swebllc.com/signal-shift-function-in-matlab/

Answer 1

[Jos (10584)]

x = 1:5
shift = 3
x = circshift(x,shift)
N = numel(x)
ix = (1:N) - shift
tf = ix < 1 | ix > N
x(tf) = 0 

Answer 2

[SSG_newbiecoder]

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.

Answer 3

[Jos (10584)]

x = 1:10 
k = 3
xs = circshift(x,k)

Answer 4

[Manoj Kumar Koduru]

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);

[Shukumar Pattnaik]

sir what is the use of line 5 ??

Answer 5

[Sk Group]

Signal Shift function in MATLAB

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

Answer 6

[Sk Group]

Signal Shift function in MATLAB

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

Signal Fold function in MATLAB

MATLAB CODE:

function [y n1] = sigfold(x,n)

n1 = -fliplr(n)

y = fliplr(x)

end