If you are using Efofex Parameters, you are almost certainly using the range command.

$y=range(1, 20, 0.5)

This command will produce a random value, between 1 and 20, going up in 0.5, every time you regenerate parameters. The values that are produced might, for example, go 5.5, 7, 12, 18.5, 20, 4, 1.5… The range command is one of the main ways of adding variation to your questions.

The new sequence command works in almost exactly the same way.

$y=sequence(1, 20, 0.5)

This command will produce a value from exactly the same set of values as the previous range command. The only difference is that the numbers will be generated sequentially every time you regenerate. They values might be 17.5, 18, 18.5, 19, 19.5, 20, 0.5, 1, 1.5…

We have found this to be useful for some questions and wanted to make the facility available for everyone.