| # quick display of the results of "make parab.out" | |
| import numpy as np | |
| from matplotlib import pyplot | |
| d = np.loadtxt('parab.out') | |
| p = d.transpose()[0] | |
| a = d.transpose()[1] | |
| dp = np.array([x+1024*1024 if x < 0 else x for x in np.diff(p)]) | |
| am = np.array(a[:-1]) | |
| ascale = 0.005 | |
| fscale = 0.5**20 * 10000 | |
| dt = 1.0/10000.0 | |
| t = dt * np.arange(len(dp)) | |
| pyplot.plot(t, dp*fscale, label='f (Hz)') | |
| pyplot.plot(t, am*ascale, label='amp (%)') | |
| pyplot.ylim(0, 270) | |
| pyplot.xlabel('Time (s)') | |
| pyplot.legend(loc="upper left", frameon=False) | |
| # pyplot.savefig("chirp.png") | |
| pyplot.show() | |