Need to add an element in a numpy array

Question

I need to add an element to the numpy array. But append and extend are both not working. Here a1 is a function.

import numpy as np
def a1(f):
    return 700*(np.exp(f/1125.0) - 1)

f = np.zeros(26)
N = 26
f_min = 300
f_max = 16000

for n in range(N):
    f[n] = (f_min + n*(f_max - f_min)/(N-1))

h = a1(f)
h = h[::-1]
np.append(h, 0)
print h

The output is:

[ 16000.          14221.33951611  12632.11814102  11212.15935635
  9943.43557641   8809.83927267   7796.97847492   6891.99405301
  6083.39645924   5360.91985872   4715.39179592   4138.6167425
  3623.27204809   3162.81497306   2751.39962281   2383.80272921
  2055.35733672   1761.89355146   1499.68560083   1265.40453166
  1056.07594631    869.04224018    701.92886113    552.61416253
  419.20246718    300.        ]

Why is the 0 in the last is not getting appended? Also the type of h is numpy.ndarray.

Instead of that for-loop (and np.zeros), you could use f = np.linspace(f_min, f_max, N). — unutbu
– unutbu, Commented May 26, 2015 at 12:03

Zero · Accepted Answer · 2015-05-26 11:56:04Z

2

You need to assign np.append(h, 0) to h like

h = np.append(h, 0)
print h

answered May 26, 2015 at 11:56

Zero

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