How can I randomize elements in an array by a set amount?

2016 2 23
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更新时间：2016 2 23
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For example, if i had the array
a = (5,5,5,5,5);
and I wanted to randomize some of the elements in the array by 1 so that it would look like
a = (5,6,5,5,4);

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Azzi Abdelmalek
Azzi Abdelmalek 2016-2-23

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a = [5,5,5,5,5];
out=a+randi([-1 1],size(a))

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Daniel Blair
Daniel Blair 2016-2-23
This works!
Maybe this is asking for too much, but once the randomization process has occured, i.e a = [5,5,5,5,5] has become [5,6,5,5,4], is it possible for the program to start with the last modified array? In this case, the next time it would run would be turning a = [5,6,5,5,4] into possibly [6,7,5,4,3].
Daniel Blair
Daniel Blair 2016-2-23
编辑：Daniel Blair 2016-2-23
Okay, lets say I run the code starting with a = [5,5,5,5,5], and then it randomizes some of the elements by adding or subtracting 1 to it. The array called a is now [6,5,5,4,4].
The next time I run the code, I want the program to remember that the array is now [6,5,5,4,4] before randomizing some of its elements by adding or subtracting 1 to them.
(This would mean that after a few executions of the program, the array could look like this: [2,7,4,5,6])

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