randomImax

A function that can be used in Formulas.

## Syntax and semantics

`randomImax` (`distribution#`)
  sample from an array of relative probabilities.

## Example

The following draws the outcome 1 one half of the time, the outcome 2 one sixth of the time, and the outcome 3 one third of the time:

`for i to 20
` `outcome = randomImax ({ 3.0, 1.0, 2.0 })
` `appendInfoLine: outcome
` `endfor
` `=>`
`3
` `3
` `1
` `3
` `1
` `2
` `2
` `2
` `2
` `3
` `3
` `3
` `2
` `3
` `1
` `1
` `1
` `1
` `1
` `2
`

All elements of the vector have to be non-negative:

`asserterror Element 2 is less than zero; cannot interpret as a probability.
` `a = randomImax ({ 3.0, -1.0, 2.0 })
`

Some elements of the vector may be zero. The following draws the outcome 1 60 percent of the time, and the outcome 3 40 percent of the time:

`for i to 20
` `outcome = randomImax ({ 3.0, 0.0, 2.0 })
` `appendInfoLine: outcome
` `endfor
` `=>`
`1
` `3
` `1
` `1
` `3
` `3
` `1
` `1
` `3
` `1
` `1
` `1
` `1
` `1
` `1
` `1
` `1
` `3
` `1
` `3
`

Not all elements of the vector can be zero:

`asserterror Cannot interpret a zero vector as probabilities.
` `a = randomImax ({ 0.0, 0.0, 0.0 })
`

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