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answered 2019-06-06 13:37:00 +0100
Add the keys ymin and ymax with suitable values. For example, compare the graphs given by
ymin
ymax
plot(x*sin(pi*x)^2, (x,0,2))
and
plot(x*sin(pi*x)^2, (x,0,2), ymin=2, ymax=0)