I needed this week some very basic mathematic stuff, but I didn't want to create a function node for it. So I tried to find something on flows.nodered.org, however without success...
I'm pretty sure there must something exist already, but I gave up searching after some time and started creating my own node-red-contrib-math node. So if somebody now offers me a link to an existing node with similar functionality, I will most probably drop dead instantaneously
It allows you to do rounding, truncating, summing, subtracting, multiplying, finding maximums, finding minimums, ... It can do that on a single number, but also on all numbers in an array.
As usual, all 'constructive' feedback is more than welcome before I publish it on npm. You can install the current version directly from Github:
npm install bartbutenaers/node-red-contrib-math