# how to randomize none following numbers like 1,3,4 with expression ?

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• Hi

i found question like this in the archive, but i still need help to understand how to calculate it:
i need my counter to generate random number between 1,3,4 (without number 2) and in another event between 1,2,4 (without number 3).
can i do it with the calculator, like set counter into random using calculator expression?

p.

• thanks
can you please explain to me how it works ?
i know that the random (3) gives you 0,1,2 right ?
but how the rest of the expression works and what does Round means ?
and how can i do 1,2,4 (without number 3) ?

• Round(( Random(3) * 1.5 ) + 1)

Round(( 0 * 1.5 ) + 1) = 0+1 = 1
Round(( 1 * 1.5 ) + 1) = 1.5+1 -> rounded down to 2
Round(( 2 * 1.5 ) + 1) = 3+1 = 4

so the result will always be 1,2 or 4

• what does Round means ?

Round value converts a floating point number into a integer number by rounding the value to the nearest integer number.
So for example I want to round 3.5 then it would be 4, round 3.7 would be 4 too
But if I round 3.4 or 3.3...etc it would be 3

Basically if the decimal number is higher or equal 5 then it would round it to the next nearest integer number, otherwise it would round it to the same number but with no decimals (true number/integer)

Game/App developer, artist and a community contributor.

Game/App developer, artist and a community contributor.

• can you please explain to me how it works ?

So you got this:
Round(( Random(3) * 1.5 ) + 1)

Random(3) can give you 0, 1, 2
0 * 1.5 = 0
1 * 1.5 = 1.5
2 * 1.5 = 3
Then we add 1... Resulting in: 1, 2.5, 4
If a number decimals are lower than .5 it will round to .0, if it's equal or greater than .5 it will round to the next integer, so 1.5 becomes 2.0, Fusion removes the .0 since it has no meaning, so it's just 2.

So in the end you got: 1, 3, 4

• many many thanks NaitorStudios, Linky, Vaxx, for your time and effort, it is more clear to me now.

• Another method is to fill an array, list or tokenizer with the alternatives and pick a random line / item. Not as fancy, but simple and does the job

• The Random Multipool Object extension is good for this too.

• Yeah, the problem with a math-based solution is that if you later decide that you need different set of numbers, you'll need to work out a whole new formula (not always easy). Plus, if you come back and look at the event months later, it won't be obvious what the formula even does.

If your set of numbers is dynamic (if you're frequently adding, removing or changing numbers at runtime), then a List object or other extension is probably the best option.

If it's fixed, or very simple, I'd just use string functions:

// For 3 single digit numbers
val( mid\$( "134", random( 3 ), 1 ))

// For 3 two-digit numbers - note the leading zeroes
val( mid\$("05,06,14", random(3) * 3, 2 ))

It's simple, easily adjustable and very clear as to what it does.

// If you want to use the same method with a dynamic set of numbers, you can store them in an alterable string - I've done this a lot in my random maze generation examples.
val( mid\$( alterableString , random(len( alterableString )), 1 ))

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