how to shift specific elements in a array to a specific position?

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Nurahmed 2019-6-21

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回答： Nurahmed 2019-6-21

I have an arry A = [1,2,3,4,5,6,7,8,9,10]. I want specific elements to shift the order but remain with the same elements. E.x. I want 3 elements (7,8,9) in A to shift 3 postions to the left to get an array B = [1,2,3,7,8,9,4,5,6,10]

Thanks,

Nur

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Manali Gupta 2019-6-21

Hi,

I assume that you know the index from which you need to shift.

Here,

a=1:10;

k=7;i=3;

b=[a(1:k-i-1) a(k:k+i-1) a(k-i:k-1) a(k+i:end )];

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Answer 1

obaldia 2019-6-21

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Hello Nur!

Just shift the positions in the vector if you know the current position,

A = [1,2,3,4,5,6,7,8,9,10]
startPos = 7;
numElements = 3;
B = A;
oldElements = A(startPos-numElements:startPos-1); 
B(startPos-numElements:startPos-1)=A(startPos:startPos+numElements-1);
B(startPos:startPos+numElements-1)=oldElements