Matplot using on Node-RED

General
21

OK, so the command will not run on the server in a terminal, in that case it is not going to run in an exec node either.

22

@Colin Yup. I have to install a dekstop environment. All are more than a GB. Do you know any lightweight desktop environment for ubuntu ?

23

I don't think matlab is the right tool for the job. You need to find command line tools that will do whatever you need to do.

24

Any suggestion?

25

Since you haven't given a clue about what you are trying to do then no I haven't. However a node-red forum is unlikely to be the best place to ask that.

26

Reading the matplotlib documentation, instead of spawning a window, you can save the output to an svg or png.
I even see output to plotly, you could use this to show it on the node-red dashboard. These options will limit interactivity compared to a window, but it could work.

1 Like
27

Thanks @bakman2

28

Bokeh might be another solution, but the JS side of things when working between python and JavaScript take a lot of time setting up.
https://docs.bokeh.org/en/latest/index.html

Iā€™ve good experience with an environment that is a mix of python and js using Baiduā€™s eCharts.
What I do there is have python do the processing of data, then output all needed info in a dict, which is then converted to json and returned. When doing this with an exec node, you would print the json to stdout, use a json node to get it back in object form, then set up the echarts instance in a dashboard template node and make sure it comes in there. Personally I donā€™t use the dashboard nodes but uibuilder for this but both situations should work.
https://www.echartsjs.com/en/index.html