We have added another way to define a parameter

$a=factor(value)
$a=factor(value,low,high)

When you regenerate a parameter defined with a factor command, $a will be allocated a random value selected from the factors of the number you have selected.

For example

$a=factor(72) will mean that $a is randomly selected from the list {1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72}

The low and high values (which are optional) allow you to restrict the factors selected.

$a=factor(72,10,40) will mean that $a is randomly selected from the list {12, 18, 24, 36}