topic Re: Arcade question: Round() function in ArcGIS Online Questions

Arcade question: Round() function

WingCheung1 — Sun, 10 Jul 2022 23:47:39 GMT

Hello,

I wrote a very simple expression and used the Round function. The output of the Round function (i.e. 3.14) is correct, but when I multiply that output by a constant of 10, it is giving me the answer of 31.400000000000002 instead of 31.4. Is there a simple explanation for this? Did I miss something? Thanks!

Re: Arcade question: Round() function

DanPatterson — Mon, 11 Jul 2022 00:14:29 GMT

It is called "floating point representation" an historic issue well covered.

you might want to round the multiplied value as well.

Python example, which you can emulate in arcade with concatenation

"{} vs {}".format(round(math.pi, 2), round(math.pi * 10, 1)) '3.14 vs 31.4'

Re: Arcade question: Round() function

WingCheung1 — Mon, 11 Jul 2022 00:26:04 GMT

Thank you for the quick reply, Dan!