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from matplotlib.matlab import *



dt = 0.01

t = arange(dt, 20.0, dt)



subplot(311)

semilogx(t, exp(-t/5.0))



subplot(312)

semilogx(t, sin(2*pi*t))



subplot(313)

loglog(t, exp(-t/10.0))

#savefig('log_demo')

show()