Picking random variable in an array once only

[Ofel]

x[1] = 50
x[2] = 52
x[3] = 54
x[4] = 56
x[5] = 58

I have these five array variables and I want to pick each one by random without picking it back twice or more.
How do I achieve this? Thanks in advance.

 

[Pyrogasm]

If you want to be able to use this data again without overwriting it then first clone it into a new array and work with that array; if you don't care about losing the data you can just work with x directly.

1. Randomize a number R from 1-N. N is initially 5 (the total available to be randomly picked), but will be reduced later
2. Do whatever you want with x[R]
3. Replace x[R] with x[N] (swap it into its position)
   
4. Reduce N by 1
5. Repeat

If you just want to keep using that same array instead of cloning you can also use the [InitialN + 1]th index (or the [0]th index) to temporarily store x[R] before overwriting it:

• x[R] -> x[InitialN + 1]
• x[N] -> x[R]
• x[InitialN + 1] -> x[N]