在Python中实现MATLAB代码时出错

ldioqlga  于 2023-04-22  发布在  Python
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我试图在python中实现这段代码。它在MATLAB中工作得很好,但是当我使用相同的逻辑时,python解释器给出了不同的答案。
我在finding the correct function or method in python有问题。需要关于这方面的帮助。代码如下
验证码:

Sensors = 10; %number of receivers
samples = 10000; %number of set of signals
p = 10; %number of signals
theta1 = [10 20 40 60 100 120 140 80 90 110];
angles = theta1*(pi/180);
X = zeros(Sensors,samples);
for k=1:p-1
    Array_factor = exp(j*pi*cos(angles(1,k))*(0:Sensors-1 ));
    br =ones(1,samples); %creating real values between 1-10000
    temp = rand(1,samples); %generate random numbers b/w 1 and 10000
    br(find(temp<.5))=-1; %find real numbers
    bi =ones(1,samples); %creating imaginary values between 1-10000
    temp = rand(1,samples); %generate c omplex random numbers b/w 1 and 10000
    bi(find(temp<.5))=-1; %find imaginary numbers
    b = br+j*bi;
    X = X +Array_factor'*b; %complete Input signal combined with array factor
end

上面是一个MATLAB代码,现在我已经将其转换为Python

import numpy as np

#number of receivers
num_sensors = 10

#Total samples to scan
samples = 10

#number of signals
p = 10

theta1 = [10,20,40,60,100,120,140,80,90,110]

#angles in degrees
angles = [i*(np.pi/180) for i in theta1]

#Input Signal
X = np.zeros((num_sensors,samples), dtype = complex)

for k in range(1,p-1):
    array_factor = np.exp(1j*np.pi*np.cos(angles[k])*np.arange(sensors))
    
    #creating real values 
    
    br = np.ones(samples)

    temp = np.random.rand(samples)

    br[temp < 0.5] = -1
#        br[temp<0.5] = -1

    bi = np.ones(samples)

    temp = np.random.rand(samples)

    bi[temp<0.5] = -1

    b = br + 1j*bi

    X += np.dot(array_factor,b)

print(X)

Python中预期的输出
X = 10 x 10000b = 1 x 10000

qltillow

qltillow1#

Array_factor'*b表达式的NumPy等价物是:

np.atleast_2d(array_factor).conj().T @ np.atleast_2d(b)
  • np.atleast_2d(array_factor).conj().Tarray_factor从行向量转换为列向量,如following answer中所述。

.conj().T'运算符的NumPy等价物。

  • np.atleast_2d(b)b从1D数组转换为2D数组。

注意,在MATLAB中,行向量是2D数组(所有向量都是矩阵),而在NumPy中,行向量是1D数组。

  • @运算符用于矩阵乘法(与* MATLAB运算符匹配)。

我们也可以使用dot product:np.dot(np.atleast_2d(array_factor).conj().T, np.atleast_2d(b))
注意事项:
由于Array_factor是复数,我们必须使用.'进行转置。
'运算符产生复共轭转置
循环索引中还有另一个bug:
应该是for k in range(p-1)而不是for k in range(1,p-1)
Python代码更新:

import numpy as np

#number of receivers
num_sensors = 10

#Total samples to scan
samples = 10000

#number of signals
p = 10

theta1 = [10,20,40,60,100,120,140,80,90,110]

#angles in degrees
angles = [i*(np.pi/180) for i in theta1]

#Input Signal
X = np.zeros((num_sensors,samples), dtype = complex)

for k in range(p-1): #for k in range(1,p-1):
    array_factor = np.exp(1j*np.pi*np.cos(angles[k])*np.arange(num_sensors))
    
    #creating real values 
    
    br = np.ones(samples)

    temp = np.random.rand(samples)

    br[temp < 0.5] = -1
#        br[temp<0.5] = -1

    bi = np.ones(samples)

    temp = np.random.rand(samples)

    bi[temp<0.5] = -1

    b = br + 1j*bi

    #X += np.dot(array_factor, b)
    X += np.atleast_2d(array_factor).conj().T @ np.atleast_2d(b)

print(X)

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