Hi everyone,
I'm trying to draw graphs with discontinuities in it, like this:
from pyx import *
from math import cos, pi
def f(x):
return cos(x % (pi/2))
g = graph.graphxy(width=8, height=3.25, xpos=0, ypos=8, x2=None, y2=None,
x=graph.axis.lin(min=0, max=5, title="$t [s]$"),
y=graph.axis.lin(min=-0.3, max=1.3, title="$U(t) [V]$"))
g.plot(graph.data.function("y(x)=f(x)", context=locals()),
[graph.style.line()])
g.writePDFfile("discont")
However, there are two problems with this:
1. The vertical slopes between the single instances of the sawtooths are
not perfectly vertical. In cases, where I want to explicitely visualize
that a function has discontinuities, this is something that will
probably make the reader stumble.
2. In most books, the vertical slopes are not displayed at all. I cannot
currently do this with graph.data.function.
When using a graph.data.paramfunction, it looks a bit better, but when
zooming in, one can still see, that the slopes are not perfectly
vertical. I know that I can use graph.data.list to exactly control the
points that are output, but I guess there should be a better way?
Markus
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