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Simple Matlab question

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sgharagoz

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How can I do this in matlab?

a = [0 0 1 2 3]

shift to the left and get

a= [0 1 2 3 0]


cheers
 

sgharagoz said:
How can I do this in matlab?

a = [0 0 1 2 3]

shift to the left and get

a= [0 1 2 3 0]


cheers
Click to expand...

Code: 
>> a=[ 0 1 2 3 0];
>> circshift(a,[1 1])

ans =

     0     0     1     2     3

circshift(A,shiftsize) circularly shifts the values in the array, A, by shiftsize elements. shiftsize is a vector of integer scalars where the n-th element specifies the shift amount for the n-th dimension of array A. If an element in shiftsize is positive, the values of A are shifted down (or to the right). If it is negative, the values of A are shifted up (or to the left). If it is 0, the values in that dimension are not shifted.
 
Hi
i=1;
a=[0 0 1 2 3]
s=size(a)
b=[a(i+1:s(2)), a(i)]
 

Code: 
a = [0 0 1 2 3];
x=0;                             % circular shift up or down. up when positive, down when negative, no shift when 0;
y=-1;                           % circular shift left or right. right when positive, left when negative, no shift when 0;
a=circshift(a,[x y]);

Try it! Goodluck. :D
 
Is it possible to this?
first I have matrix X
X = [ 0 0 1 2 3];
and i want to shift it to left and replace the numbers by zero so I get

X = [3 0 0 0 0];
 

i = 1 % 'i' is positive integer range in X'range. and it is only works in left shift

Code: 
X = [ 0 0 1 2 3];
X = horzcat(X(i+1:length(X)),zeros(1:i));
 

sgharagoz said:
Is it possible to this?
first I have matrix X
X = [ 0 0 1 2 3];
and i want to shift it to left and replace the numbers by zero so I get

X = [3 0 0 0 0];
Click to expand...


supports both left shift and right shift

Code: 
%blooz Shift fill Zero 
function y=shift_filzero(x,n)

if n<0
    temp1=zeros(1,-n);
    temp2=circshift(x,[1 n]);
    temp3=[temp2(1:-n),temp1];
else

    temp2=circshift(x,[1 n]);
    temp3=[zeros(1,n),temp2(1:n)];
end

y=temp3


example

Code: 
>> a=[ 0 1 2 3 4 5 6 7];

>> shift_filzero(a,4)

ans =

     0     0     0     0     4     5     6     7

>> shift_filzero(a,-4)

ans =

     4     5     6     7     0     0     0     0
 

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