One example:
t=var('t')
a=plot(sin(t),t,-pi,pi)
a.save('test.pdf')
a.save('test.png')
In the pdf the function looks "better", since it seems to go through
(0,0) which is not the case in the png.
It is even more clear to the eye when adding extra thickness to the
plot:
t=var('t')
b=plot(sin(t),t,-pi,pi,thickness=2)
b.save('test1.pdf')
b.save('test1.png')
But then the function seems to be positive in t=-pi and negative in
t=pi because of the way the beginning and end is drawn graphically. So
by keeping thickness to max 1 and saving as pdf the plot is ok.
Just a small question: Is there any reason why the end of the function
is rounded while the beginning is not?
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