How can i obtain column vector from 3d matrx

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RADWAN A F ZEYADI 2021-10-30

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评论： DGM 2021-10-30

Hi every one

i would like to obtain a vector with dimension 153*1 from 3d array with dimension 51*71*3 ?

thank you

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Answer 1

DGM 2021-10-30

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https://ww2.mathworks.cn/matlabcentral/answers/1575263-how-can-i-obtain-column-vector-from-3d-matrx#answer_820253

编辑：DGM 2021-10-30

在 MATLAB Online 中打开

Consider the example:

% create an array
s = [5 7 3];
A = reshape(1:prod(s),s)
A = 
A(:,:,1) =

     1     6    11    16    21    26    31
     2     7    12    17    22    27    32
     3     8    13    18    23    28    33
     4     9    14    19    24    29    34
     5    10    15    20    25    30    35


A(:,:,2) =

    36    41    46    51    56    61    66
    37    42    47    52    57    62    67
    38    43    48    53    58    63    68
    39    44    49    54    59    64    69
    40    45    50    55    60    65    70


A(:,:,3) =

    71    76    81    86    91    96   101
    72    77    82    87    92    97   102
    73    78    83    88    93    98   103
    74    79    84    89    94    99   104
    75    80    85    90    95   100   105
% create a vector containing all pages in the first column
B = reshape(A(:,1,:),[],1,1)
B = 15×1
     1
     2
     3
     4
     5
    36
    37
    38
    39
    40

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RADWAN A F ZEYADI 2021-10-30

thank you and if i want the opposit from 153*1 to 3d 51*71*3?

thanks alot

DGM 2021-10-30

在 MATLAB Online 中打开

If you have a 153x1 vector, you don't have 51x71x3=10863 elements to fill that array. They've been discarded.

You can recreate the original 51x1x3 column:

% create an array
s = [5 7 3];
A = reshape(1:prod(s),s)
A = 
A(:,:,1) =

     1     6    11    16    21    26    31
     2     7    12    17    22    27    32
     3     8    13    18    23    28    33
     4     9    14    19    24    29    34
     5    10    15    20    25    30    35


A(:,:,2) =

    36    41    46    51    56    61    66
    37    42    47    52    57    62    67
    38    43    48    53    58    63    68
    39    44    49    54    59    64    69
    40    45    50    55    60    65    70


A(:,:,3) =

    71    76    81    86    91    96   101
    72    77    82    87    92    97   102
    73    78    83    88    93    98   103
    74    79    84    89    94    99   104
    75    80    85    90    95   100   105
% create a vector containing all pages in the first column
B = reshape(A(:,1,:),[],1,1)
B = 15×1
     1
     2
     3
     4
     5
    36
    37
    38
    39
    40
% recreate the 51x1x3 part of A
C = reshape(B,[],1,s(3))
C = 
C(:,:,1) =

     1
     2
     3
     4
     5


C(:,:,2) =

    36
    37
    38
    39
    40


C(:,:,3) =

    71
    72
    73
    74
    75