将 3D 阵列重塑为 2D

Question

查看以下玩具示例：

m = 3;
n = 3;
Y = rand(m,n,2);

例如给我

y(:,:,1) =

0.8314    0.3993    0.6569
0.8034    0.5269    0.6280
0.0605    0.4168    0.2920

y(:,:,2) =

0.4317    0.1672    0.1981
0.0155    0.1062    0.4897
0.9841    0.3724    0.3395

现在当我使用

重塑它时

reshape(Y,m*n,2)

扰乱秩序给我，

0.8314    0.4317
0.8034    0.0155
0.0605    0.9841
0.3993    0.1672
0.5269    0.1062
0.4168    0.3724
0.6569    0.1981
0.6280    0.4897
0.2920    0.3395

because here 2nd row should be

0.3993    0.1672

这可以在重塑之前通过

进行交叉检查

Y(1,1,:)
Y(1,2,:) 
etc.

顺序改变。

PS：我有大量数据要输入神经网络，这会影响我的权重相乘的方式。

Answer 1

加入permute there and then reshape，像这样-

reshape(permute(y,[2,1,3]),[],size(y,3))

样本运行-

>> y
y(:,:,1) =
       0.8314       0.3993       0.6569
       0.8034       0.5269        0.628
       0.0605       0.4168        0.292
y(:,:,2) =
       0.4317       0.1672       0.1981
       0.0155       0.1062       0.4897
       0.9841       0.3724       0.3395
>> reshape(permute(y,[2,1,3]),[],size(y,3))
ans =
       0.8314       0.4317
       0.3993       0.1672
       0.6569       0.1981
       0.8034       0.0155
       0.5269       0.1062
        0.628       0.4897
       0.0605       0.9841
       0.4168       0.3724
        0.292       0.3395

将 3D 阵列重塑为 2D

Reshaping 3D array to 2D

matlab

reshape