Using mean with units throws error in evaluate function

Using a calculation like this:

var calculation = "mean(5km,10km)"; math.evaluate(calculation);

results in the following error: Cannot calculate mean, unexpected type of argument (type: Unit, value: {"mathjs":"Unit","value":5,"unit":"km","fixPrefix":false})

It is because of the units, because the line var calculation = "mean(5,10)"; works perfectly fine.

I tested the same with functions like sum, max, min, median and mode and there it works fine with units. With mean, however it does not, which looks like a bug. Using mathjs 6.2.2

[ericman314]

Thanks, @clintonc!

@Chris1234567899, if you mean round(6.35 cm) or something, that’s not supported because we don’t want the results of expressions to change based on what units they’re written in:

equal(6.35 cm, 2.5 in) // true
equal(round(6.35 cm), round(2.5 in)) // false

It’s even more problematic when the argument to round(...) is an expression itself with various units, then there’s no telling which unit it will be expressed in when it is passed to round.

Edit: For example, what should round(1 in + 1 cm) return?

[clintonc]

I’d like to work on this (and related matters); I’ve got working code and tests, so I can make a PR later today.