SoFunction
Updated on 2024-10-30

Based on python implementation of matlab filter function process details

The filter function in matlab:

y = filter(b,a,x)

python implementation of the filter function in matlab

def filter_matlab(b,a,x):
  y = []
  (b[0] * x[0])
  for i in range(1,len(x)):
    (0)
    for j in range(len(b)):
      if i >= j :
        y[i] = y[i] + b[j] * x[i - j ]
        j += 1
    for l in range(len(b)-1 ):
      if i >l:
        y[i] = (y[i] - a[l+1] * y[i -l-1])
        l += 1
    i += 1
  return y

example:

get

b = [8,-3.5,0.5]
a = [1,-1.5,0.25]
x = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]
y = filter_matlab(b,a,x)

The result of the function is consistent with the result of matlab's filter function, which is

[8,
 24.5,
 52.25,
 94.75,
 156.5625,
 243.65625,
 363.84375,
 527.3515625,
 747.56640625,
 1042.01171875,
 1433.6259765625,
 1952.43603515625,
 2637.74755859375,
 3541.0123291015625,
 4729.581604003906,
 6291.619323730469,
 8342.533584594727,
 11033.395545959473,
 14561.959922790527,
 19187.090997695923]

This is the whole content of this article.