6. 配列の形状操作（reshape, flatten など）¶

import numpy as np

# 3x4の配列を作成
array = np.array([[1, 2, 3, 4],
                  [5, 6, 7, 8],
                  [9, 10, 11, 12]])

# 配列の形状を確認
print("Original shape:", array.shape)

import numpy as np

# 3x4の配列を1x12に変形
reshaped_array = array.reshape(1, 12)
print("Reshaped to 1x12:")
print(reshaped_array)

# 2x6に再度変形
reshaped_array = array.reshape(2, 6)
print("Reshaped to 2x6:")
print(reshaped_array)

# 配列を一次元に平坦化
flattened = array.flatten()
print("Flattened array:")
print(flattened)

# ravelによる一次元化
raveled = array.ravel()
print("Raveled array:")
print(raveled)

# newaxisを使って次元を追加
expanded = array[:, np.newaxis, :]
print("Expanded array shape:", expanded.shape)