How can I select a random variable from an array?

Can someone please help me with the following?

I would like to know how to select a random Instance variable stored in an array.

If the array is 1d and has the length 10 ...

Set value --> arrayname.At(int(random(10)))

10 can be changed to the array size/length expression..

array.at(floor(random(array.width)),floor(random(array.height)))

This get the value from a randon cell in the array... Is that what you want?

Joe7 showed how to handle a 1 dimensional array. Sqiddster showed how to handle a 2 dimensional array. Here is an example that also handles a three dimensional array.

Actually, it has 3 arrays: one dimension, two dimension, and three dimension. It loops through all dimensions of the arrays inserting a number into each "cell" and then when the mouse is clicked, retrieves a value from a random "cell" in each array.

GetRandomArrayValues.capx

Thank you for your replies. It's a 1d array do I will use Joe7's answer.

Thans staan!

If I have a 2 dimensional array that stores 0s and 1s, how can I pick random 1?

See the first answer above.

Umh, I get a random cell. But what I want is a random cell from the cells that contain value "1".

I tried just picking random cells and see if it contains value 1 or not, but since it is in "while" loop and does not get 1, it goes nuts and crashes.

Ah.. I was going to ask if you want a 'random one' or a 'random 1'

You could loop through the array, and when you have a '1' you add the array index to a temporary array. Then use the above method on that array to get an index into the first array.

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What if you want to select a random element, but don't know what the length of the array is?