How to shift entries in a vector by the value of the number in that entry?

For example, if i have a vector

T = [0, 0, 4, 0, 7, 0, 0, 5, 0, 9]

How would i go about moving every entry to the right by the number in that entry?

Ie: T(3) 4 spaces to the right, T(4) 0 spaces to the right, and T(8) 5 spaces to the right so that it overwrites the orginal T(3).

Thanks.

[Jan]

What is the wanted output for [1,2,3] ?

Answer 1

[Stephen23]

T = [0, 0, 4, 0, 7, 0, 0, 5, 0, 9]

T = 1×10

0 0 4 0 7 0 0 5 0 9

N = numel(T);
X = 1+mod(T+(0:N-1),N);
for k = 1:N
    T([k,X(k)]) = [0,T(k)];
end
disp(T)

     0     7     5     0     0     0     4     0     9     0

[Tim David]

This is good, thank you. Is there a way to repeat this multiple times? Ie this method used again on the new T vector, then again on the resultant T vector and so on?

[Stephen23]

"Is there a way to repeat this multiple times? Ie this method used again on the new T vector, then again on the resultant T vector and so on?"

Put it inside another loop.

Answer 2

[Robert U]

Hi Tim David,

you can apply circshift() to the data.

T = [0, 0, 4, 0, 7, 0, 0, 5, 0, 9];

shiftme = @(A,nShift) circshift(A,A(nShift));

shiftme(T,3)

Kind regards,

Robert