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Til today I've been using geogebra to sketch functions for my students quizzes or homework. Sometimes I use the ones that I found searching in google, but this takes a lot of time specially because I have multiple courses and I need to diversify the tests, homework's, etc. Recently I found this image:

enter image description here

It's there a way to make this type of graph quickly without having to define five different functions and so on?

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  • $\begingroup$ This is easy in Matlab. $\endgroup$ – Paracosmiste Aug 23 '18 at 15:22
  • $\begingroup$ Can you link to a website to make it easy as you say? $\endgroup$ – Grouper Aug 23 '18 at 16:34
  • $\begingroup$ Try this. $\endgroup$ – Paracosmiste Aug 23 '18 at 16:59
  • $\begingroup$ Wolfram alpha. $\endgroup$ – Paracosmiste Aug 23 '18 at 17:09
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Have you used Graph? There, if you want piecewise functions, a quick way to do so is to select: Function $\rightarrow$ Insert Point Series, and type the coordinates of a point. Exit that environment, and while holding Select, just click other points on your graph. You can choose how to connect them (linear, half-cosine, cubic spline) and later change this interpolation style with a click.

For the holes in the graph, you'd still have to write a formula (Function $\rightarrow$ Insert Function), specifying whether it "ends" at a point or a hole.

Note: This is a Windows application, though you can get to run on Mac with Wine.

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    $\begingroup$ Note: It's somewhat primitive and a little clunky (and my LaTeX friends show me no respect for using it), but it's fast, easily plots relations like $x*y=cos(x)-x*y^2+y^3$, and once copied into Word, you can double click to edit a graph. $\endgroup$ – Nick C Aug 23 '18 at 16:47

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