Hi all. I want to multipicate two different RANDOM nodes to use the multiplication result in another node. How can i implement this function?

Might I make a suggestion, have one inject node going to two change nodes that set the msg.topic. Also add a new join node in and replace the existing one. For some reason, the internals of the node thinks it should be doing the join using 'bin' when it should be 'str'. I've seen this happen before…

Hi and thanks for your reply. I've just read your link but i think it doesn't help me. You can see attached my flow. Instead of the JOIN node i would to use a multiplication node or similar. How can implement it? [{"id":"24529235.0f95ae","type":"tab","label":"Multiplication","disabled":false,"i…

You need to do the Join first, then multiply the numbers, which should be available in msg.payload. I don't know what type the Random node is, you haven't told us, but for the Join to work the two inputs must have different topics. Also you haven't told the Join node to give you a joined message a…

Apart from considering the solution I would be fascinated to know why you want to multiply two random numbers together.

Random node creates a random number. I use this node to make a demo.

Also can you let me know what version of NR and node.js (see node-red startup log) what platform/os you are using Thanks

Hi and many thanks for your reply. I've just resolved using a function node after join node. However i save your solution for further implementation. This is the cose used in function node: var prodotto = {payload: msg.payload.Corrente * msg.payload.Tensione}; return prodotto;

And I figured out whet the bug is in the join node and am reporting it.

These are my system info: Node-RED version: v1.0.3 Node.js version: v10.19.0 Linux 4.19.57+ arm LE Raspberry model B+ Dashboard version 2.19.4 started at /ui

FYI issue raised to fix the bug see: https://github.com/node-red/node-red/issues/2491 If you do hit this issue, you can fix the node by switching the 'to create' option to 'a String' and changing the 'join using' to 'a/z' thn changing the 'to create' back to what you originally had.

Multiplication function or similar

General

Colin 1 March 2020 15:41 2

What do you mean by RANDOM nodes? Do you mean a particular node type that you have installed?

If you mean that you have two messages coming in from different nodes and you want to join the messages so that you can use data from both nodes in a function node (for example) then have a look at the example in the cookbook on joining streams.
https://cookbook.nodered.org/basic/join-streams

Topic		Replies	Views
Multiply two variables General	12	6915	23 January 2021
Help with multiple inputs to a function node! General	25	51878	25 November 2018
2 msg.topic in calculation function node General	24	6249	28 November 2018
Join output from two function nodes General	16	3393	10 April 2020
Merge eigth numbers in a function node \| same order, everytime General	26	2155	18 May 2020

Multiplication function or similar

Related topics