Plot 2D graph enhanced

Version : √ OneNote for Windows 10

√ OneNote Online

The “Graph in 2D” feature introduced in May 2017 is being improved gradually, and is now able to do much more than its simple name implies : let’s have a look at this amazing feature for student !

[instead of illustrating this blog post with usual linear curves, parabolas or hyperbolas… I choose emblematic curves instead, and mentioned the name of the mathematicians having discovered or studied them : enjoy this journey into the world of Mathematics !]

Simple curves

Obviously, you can plot the curve of an equation with unknowns x and y, in a Cartesian coordinate system.

animation avec une courbe simple, insérée dans la note
Equilateral clover (also called “trisectrice de Longchamps”, studied by G. de Longchamps in 1884)

Note in the above example that the equation doesn’t need to be written such as y = f ( x ).

You may even insert the graph on your note after resizing the plot area if necessary. The pasted graph is not interactive though, so you’d better ajust the zoom first.

Curve with parameters

More useful, you can add parameters to your equation, in order to change the proportions of the curve :

Equation avec trois paramètres
Bernoulli lemniscate (studied by Jacques Bernoulli in1694 and Fagnano in 1750).

Multiples curves

You may also plot several curves on the same graph, providing you group them with a brace.

See the illustration below, in a tweet I wrote when I discovered this feature :

Please note that :
– the legend may be exhibited moving the cursor over the symbol at the bottom left,
– the legend are not carried forward when you drag the graph in your note,
– the color of the curves in the graph do not match those of the inked equation.

Also, I tried to plot both equations above in the same graph (clover and lemniscate) but it didn’t worked : OneNote offered no option in this instance, except ink to math

LIRE AUSSI  Plot a 2D Graph


Agnesi’s Cubic (curve studied by Pierre de Fermat in 1630 and Maria Gaetana Agnesi in 1748), also called versiera (= Witch of Agnesi) or Cauchy bell.

Nevertheless, you can’t combine both features above (multiple curves and inequalities), as illustrated in this tweet :



Microsoft’ announcement stating that OneNote may support functions puzzled me for a while…

Announcement in May 2018 : what’s new in OneNote for Windows 10 : I don’t see the relationship between the function on the left, and its representation on the right…

In fact, it seems that Microsoft was simply announcing support for multiple equations plotted in the same graph, as illustrated in the previous section.

And I am not merely quibbling about wording (function or equation ?) : as a matter of fact, experimenting with the same equation written in similar ways (equation & function), I noticed that OneNote makes a confusion with the f in f ( x ) , believing it’s a parameter…

Furthermore, writing fx instead of f ( x ), you’ll get the same result.

So, what’s the purpose of the new command “Graph both sides in 2D” ?



The only usage I can think of, is to show the intercept of two equations (one on each side of the equal sign) :

Moving the mouse over one curve or the other, the coordinates are shown, but there’s no anchor (or magnet) to reach precisely the intercept.


Key features

Finally, OneNote may sometimes mention the key features of your equation such as minima, maxima, intercepts, asymptotes, inflexion points, range, domain… and show them on the graph.



Sometimes though, OneNote is not able to plot an equation :

Quadruple tore algebrique représenté dans Geogebra
Quadruple algebraic torus in Geogebra & OneNote


Now it’s your turn to share your nicest curves !


Reference : All curves illustrating my blog post were found on Mathcurve.

Updated 21/08/2018 : now available in OneNote Online as well :

Nota 22/09/2018 : Graph Inequality seems to be broken :

Nota 14/02/2019 : Valentine day ! Can’t resist to share this amazing curve !


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