power_key = np.power(2, np.arange(N - 1, -1, -1)) 为何无效
时间: 2023-05-28 20:03:49 浏览: 47
这可能是因为您没有导入NumPy库。请确保您在代码的开头使用以下语句导入NumPy库:
import numpy as np
如果您已经导入了NumPy库,那么请提供更多的上下文,以便我们更好地了解您的问题所在。
相关问题
data00=data m,n = np.shape(data00) a = np.array(data00) Data00 = a[1:m,2:n] Data00 = Data00.astype(np.float64) Power = Data00[:,13] Power_train = Power[0:96] P_min = np.min(Power_train) P_gap = np.max(Power_train)-np.min(Power_train) Power_uni = (Power-P_min)/P_gap # 提取imfs和剩余信号res emd = EMD() emd.emd(Power_uni) imfs, res = emd.get_imfs_and_residue() N = len(imfs) P_H = np.sum(imfs[0:6,:],axis=0) P_M = np.sum(imfs[6:12,:],axis=0) P_L = res P_H =np.expand_dims(P_H,axis=1) P_M =np.expand_dims(P_M,axis=1) P_L =np.expand_dims(P_L,axis=1) Nwp = Data00[:,0:7] Nwp_train = Nwp[0:96] N_min = np.min(Nwp_train,axis=0) N_gap = np.max(Nwp_train,axis=0)-np.min(Nwp_train,axis=0) Nwp_uni = (Nwp-N_min)/N_gap#(N,7) Weather = Data00[:,7:13] Weather_train = Weather[0:96] W_min = np.min(Weather_train,axis=0) W_gap = np.max(Weather_train,axis=0)-np.min(Weather_train,axis=0) Weather_uni = (Weather-W_min)/W_gap#(N,6) 优化代码
以下是部分代码的优化建议:
1. 对于以下代码段:
```
a = np.array(data00)
Data00 = a[1:m,2:n]
```
可以合并为一行:
```
Data00 = np.array(data00)[1:m,2:n]
```
2. 对于以下代码段:
```
P_H = np.sum(imfs[0:6,:],axis=0)
P_M = np.sum(imfs[6:12,:],axis=0)
P_L = res
P_H =np.expand_dims(P_H,axis=1)
P_M =np.expand_dims(P_M,axis=1)
P_L =np.expand_dims(P_L,axis=1)
```
可以使用 `np.newaxis` 替代 `np.expand_dims` 来实现:
```
P_H = np.sum(imfs[0:6,:],axis=0)[:, np.newaxis]
P_M = np.sum(imfs[6:12,:],axis=0)[:, np.newaxis]
P_L = res[:, np.newaxis]
```
3. 对于以下代码段:
```
N_min = np.min(Nwp_train,axis=0)
N_gap = np.max(Nwp_train,axis=0)-np.min(Nwp_train,axis=0)
Nwp_uni = (Nwp-N_min)/N_gap#(N,7)
```
可以使用 `np.ptp` 函数(peak-to-peak)来计算最大值和最小值的差:
```
N_min = np.min(Nwp_train,axis=0)
N_gap = np.ptp(Nwp_train,axis=0)
Nwp_uni = (Nwp-N_min)/N_gap#(N,7)
```
4. 对于以下代码段:
```
Weather = Data00[:,7:13]
Weather_train = Weather[0:96]
W_min = np.min(Weather_train,axis=0)
W_gap = np.max(Weather_train,axis=0)-np.min(Weather_train,axis=0)
Weather_uni = (Weather-W_min)/W_gap#(N,6)
```
可以使用与第三个优化建议类似的方法:
```
Weather = Data00[:,7:13]
Weather_train = Weather[0:96]
W_min = np.min(Weather_train,axis=0)
W_gap = np.ptp(Weather_train,axis=0)
Weather_uni = (Weather-W_min)/W_gap#(N,6)
```
当然,以上只是一些简单的优化建议,具体的优化效果还需要根据实际情况进行评估。
poly_features=np.power(features,np.arange(max_degree).reshape(1,-1))
This code creates a matrix of polynomial features from the input features. The variable "max_degree" specifies the highest degree of the polynomial features.
The function "np.power()" raises each element of the input features to the power of the corresponding element in the sequence of degrees from 0 to (max_degree-1). The resulting matrix has one row for each input feature and one column for each degree of the polynomial.
For example, if the input features are [x1, x2] and max_degree=3, the resulting matrix would be:
[[1, x1, x1^2, x1^3],
[1, x2, x2^2, x2^3]]