diff --git a/examples/animation/strip_chart.py b/examples/animation/strip_chart.py
index 5e3b8fea0d04..f06413c28661 100644
--- a/examples/animation/strip_chart.py
+++ b/examples/animation/strip_chart.py
@@ -26,13 +26,16 @@ def __init__(self, ax, maxt=2, dt=0.02):
def update(self, y):
lastt = self.tdata[-1]
- if lastt > self.tdata[0] + self.maxt: # reset the arrays
+ if lastt >= self.tdata[0] + self.maxt: # reset the arrays
self.tdata = [self.tdata[-1]]
self.ydata = [self.ydata[-1]]
self.ax.set_xlim(self.tdata[0], self.tdata[0] + self.maxt)
self.ax.figure.canvas.draw()
- t = self.tdata[-1] + self.dt
+ # This slightly more complex calculation avoids floating-point issues
+ # from just repeatedly adding `self.dt` to the previous value.
+ t = self.tdata[0] + len(self.tdata) * self.dt
+
self.tdata.append(t)
self.ydata.append(y)
self.line.set_data(self.tdata, self.ydata)
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