.. _widgets-buttons: widgets example code: buttons.py ================================ [`source code `_] :: import numpy as np import matplotlib.pyplot as plt from matplotlib.widgets import Button freqs = np.arange(2, 20, 3) fig, ax = plt.subplots() plt.subplots_adjust(bottom=0.2) t = np.arange(0.0, 1.0, 0.001) s = np.sin(2*np.pi*freqs[0]*t) l, = plt.plot(t, s, lw=2) class Index: ind = 0 def next(self, event): self.ind += 1 i = self.ind % len(freqs) ydata = np.sin(2*np.pi*freqs[i]*t) l.set_ydata(ydata) plt.draw() def prev(self, event): self.ind -= 1 i = self.ind % len(freqs) ydata = np.sin(2*np.pi*freqs[i]*t) l.set_ydata(ydata) plt.draw() callback = Index() axprev = plt.axes([0.7, 0.05, 0.1, 0.075]) axnext = plt.axes([0.81, 0.05, 0.1, 0.075]) bnext = Button(axnext, 'Next') bnext.on_clicked(callback.next) bprev = Button(axprev, 'Previous') bprev.on_clicked(callback.prev) plt.show() Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)