Convert Python Code to MATLAB Code?

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L
L 2018-11-27
评论： dany katamba mpoyi 2022-6-11
How can I convert Python code to MATLAB code? I want to convert the approximate entropy Python implementation on wikipedia to MATLAB:
Approximate Entropy:
import numpy as np
def ApEn(U, m, r):
def _maxdist(x_i, x_j):
return max([abs(ua - va) for ua, va in zip(x_i, x_j)])
def _phi(m):
x = [[U[j] for j in range(i, i + m - 1 + 1)] for i in range(N - m + 1)]
C = [len([1 for x_j in x if _maxdist(x_i, x_j) <= r]) / (N - m + 1.0) for x_i in x]
return (N - m + 1.0)**(-1) * sum(np.log(C))
N = len(U)
return abs(_phi(m+1) - _phi(m))
I would like to run the code without having to install Python, so I would like to convert the algorithm into MATLAB language. Thank you!
Wikipedia Article Link
  1 个评论
L
L 2018-11-27
Sample Entropy Wikipedia includes the MATLAB version of the code. However, when I run it on my dataset, I get NaN for my result.

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回答（1 个）

Aymane Amouri
Aymane Amouri 2021-5-5
"
import numpy as np
from lmfit import Minimizer, Parameters, report_fit
# create data to be fitted
x = np.linspace (0, 15, 301)
data = (10. * np.sin (2 * x - 0.1) * np.exp (-x * x * 0.025) +
np.random.normal (size=len (x), scale=0.2))
# define objective function: returns the array to be minimized
def fcn2min(params, x, data):
""" model decaying sine wave, subtract data"""
amp = params['amp']
shift = params['shift']
omega = params['omega']
decay = params['decay']
model = amp * np.sin (x * omega + shift) * np.exp (-x * x * decay)
return model - data
# create a set of Parameters
params = Parameters ( )
params.add ('amp', value=1, min=0)
params.add ('decay', value=0.1)
params.add ('shift', value=0.0, min=-np.pi / 2., max=np.pi / 2)
params.add ('omega', value=3.0)
# do fit, here with leastsq model
minner = Minimizer (fcn2min, params, fcn_args=(x, data))
kws = {'options': {'maxiter': 10}}
result = minner.minimize ( )
# calculate final result
final = data + result.residual
# write error report
report_fit (result)
# try to plot results
try:
import pylab
pylab.plot (x, data, 'k+')
pylab.plot (x, final, 'r')
pylab.show ( )
except:
pass
pylab.plt.figure( )
"
j'ai besoin de transformer ce code python to matlab code

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