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Question: Showing dashed line for square wave plot

Question:Showing dashed line for square wave plot

Lal 20
plot piecewise discont
February 22 2015
1

When plotting a continous function that looks something like a square wave, for example like this:

f:=x->piecewise(0<x<Pi,0,Pi<x<2*Pi,Pi);
a:=0: b:=2*Pi: p:=b-a:
fp:=f(x-floor( (x-a)/p)*p);
plot(fp,x=-6*Pi..6*Pi,discont=true);

Is there some way to show dashed vertical lines at the points of discontinuity?
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