Multiple element at same index

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Ozge Moral
Ozge Moral 2016-7-19
回答： Ozge Moral 2016-7-19
I have a question about storing multiple element at same index.
x = [-4 -2 0 2 4];
After some conditions,elements will change their places and some elements will be in same index. I want to create a vector/array/structure like this.
for example : first element to second index, Second element to third index, Third,fourth and fifth element to fourth index:
y = [0 -4 -2 (0,2,4) 0];
But i used arrays, just fifth element is at fourth index. What kind of structure can i use? i'm confused how i store multiple elements at same index.
If it is complicated to understand, i can write all code. I searched posts but i didn't find approximate solution. Thank you.

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回答（3 个）

Adam
Adam 2016-7-19
编辑：Adam 2016-7-19
Use a cell array if you really want to do this i.e.
y = { 0, -4, -2, [0 2 4], 0 };
Be aware though that using cell arrays for numeric operations considerably slows down your code so you should think about if this is the best way to design what you are doing if speed is important to you.
Guillaume
Guillaume 2016-7-19
Use a cell array:
y = {0, -4, -2, [0, 2, 4], 0} %cell array creating
y{1} %access element(s) at 1st index
y{3} %access element(s) at 3rd index
Ozge Moral
Ozge Moral 2016-7-19
Thank you for your responses. I will try to use cell array in my code. But it is little complicated, i will add my whole code if i don't do.

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