# Plot for Mathematicians
**URL:** https://talk.observablehq.com/t/plot-for-mathematicians/5388
**Category:** Show and tell
**Created:** [July 27, 2021, 9:12pm UTC](https://talk.observablehq.com/t/plot-for-mathematicians/5388 "2021-07-27T21:12:12Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@mcmcclur](https://talk.observablehq.com/u/mcmcclur)
#### Post date: [July 27, 2021, 9:12pm UTC](https://talk.observablehq.com/t/plot-for-mathematicians/5388/1 "2021-07-27T21:12:12Z")
I love [Observable.Plot](https://observablehq.com/@observablehq/plot) but most of my work is mathematical in nature, as opposed to statistical. I think the documentation, as focused as it is on data, obscures how easy it is to make some basic mathematical plots. So I wrote a notebook that I might use to introduce Observable to mathematicians:
> **[Plot for mathematicians](https://observablehq.com/@mcmcclur/plot-for-mathematicians)**
>
> Observable Plot is a free, open-source library from the folks at Observable designed to make it easy to generate many common types of charts for the visualization of data. The documentation is extensive and generally excellent. It's (understandably)...
I also wrote a notebook that illustrates a hack to get around the lack of a class channel, though I’m told that might be only a temporary issue:
> **[A Plot selection hack](https://observablehq.com/@mcmcclur/a-plot-selection-hack)**
>
> I love Observable.Plot but would often like to add some interactivity to specific parts of the plot. It would be nice if Plot included a \\\`class\\\` channel to facilitate that process. Plot does allow a \\\`title\\\` channel, though, so we can always...
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### Author:  [@mcmcclur](https://talk.observablehq.com/u/mcmcclur)
#### Post date: [September 22, 2021, 11:56am UTC](https://talk.observablehq.com/t/plot-for-mathematicians/5388/2 "2021-09-22T11:56:27Z")
I’ve been using the techniques outlined in this post more and more. Here is the most substantive thing I’ve done to this point, at least in terms of interactions:
> **[The trig summation formulae](https://observablehq.com/@mcmcclur/the-trig-summation-formulae)**
>
> This notebook walks through a proof of the trig summation formulae: A little ancillary code.