Here is a python code snippet:
# python vers. 3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 17:00:18) [MSC
v.1900 64 bit (AMD64)]
import numpy as np # numpy vers. 1.14.3
#import matplotlib.pyplot as plt
N = 21
amp = 10
t = np.linspace(0.0,N-1,N)
arg = 2.0*np.pi/(N-1)
y = amp*np.sin(arg*t)
print('y:\n',y)
print('mean(y): ',np.mean(y))
#plt.plot(t,y)
#plt.show()
ypad = np.pad(y, (3,2),'mean')
print('ypad:\n',ypad)
When I execute this the outputs are:
y:
[ 0.00000000e+00 3.09016994e+00 5.87785252e+00 8.09016994e+00
9.51056516e+00 1.00000000e+01 9.51056516e+00 8.09016994e+00
5.87785252e+00 3.09016994e+00 1.22464680e-15 -3.09016994e+00
-5.87785252e+00 -8.09016994e+00 -9.51056516e+00 -1.00000000e+01
-9.51056516e+00 -8.09016994e+00 -5.87785252e+00 -3.09016994e+00
-2.44929360e-15]
mean(y): -1.3778013372117948e-16
ypad:
[-1.37780134e-16 -1.37780134e-16 -1.37780134e-16 0.00000000e+00
3.09016994e+00 5.87785252e+00 8.09016994e+00 9.51056516e+00
1.00000000e+01 9.51056516e+00 8.09016994e+00 5.87785252e+00
3.09016994e+00 1.22464680e-15 -3.09016994e+00 -5.87785252e+00
-8.09016994e+00 -9.51056516e+00 -1.00000000e+01 -9.51056516e+00
-8.09016994e+00 -5.87785252e+00 -3.09016994e+00 -2.44929360e-15
-7.40148683e-17 -7.40148683e-17]
The left pad is correct, but the right pad is different and not the mean
of y) --- why?
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