bad argument #1 to 'random' (interval is empty)?!?!?

[Robin]

If you want to get a random number between -10 and 10 do something like this:

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value=math.random(0,20)-10

or

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value=math.random(-10,10)

Just remember,

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value=math.random(-20)

is the same as

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value=math.random(1,-20)

which gives an error, because there are no numbers >= 1 and <= -20.