Re: How is math-round different from other Calc functions?

[Mattias Engdegård]

1 feb. 2022 kl. 22.12 skrev Daniele Nicolodi <daniele@grinta.net>:

> (defmath uround (x)
>  (* (round (remove-units x)) (extract-units x)))

Looks like you may need to do `math-simplify` after `remove-units`, since 
`math-round` only works if its argument is a value, not an unsimplified 
expression such as `(* (float 4 0) 1)`.

> but it does if I replace round() with any other function:
> 
> (defmath uplus (x)
>  (* (1+ (remove-units x)) (calc-eval "kg" 'raw)))

That `(1+ ...)` becomes `(math-add ... x)` and presumably `math-add` makes an 
effort to simplify its arguments for other reasons.

At least, this is from a cursory look at the code. Does that make sense?