Can I partition a matrix ito several seperated parts ?

Question

omar th 2022-3-31

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评论： omar th 2022-4-1

采纳的回答： Voss

can I partition this matrix into 4 parts ?

assume this matrix 29X1, A = [2;2;-3;4;5;6;7;-8;9;-6;5;4;-2;1;3;-9;8;7;4;-5;6;3;2;-1;4;-7;-8;5;-6];

so, I want to group this matrix into 4 seperated groups such as B=7X1, C=7X1, D=7X1, and E=8X1 ?

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Answer 1

Voss 2022-3-31

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A = [2;2;-3;4;5;6;7;-8;9;-6;5;4;-2;1;3;-9;8;7;4;-5;6;3;2;-1;4;-7;-8;5;-6];
% maybe this:
B = A(1:7);
C = A(8:14);
D = A(15:21);
E = A(22:29);
% or maybe this:
B = A(2:4:end);
C = A(3:4:end);
D = A(4:4:end);
E = A(1:4:end);
% etc., many other partitionings are possible

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Walter Roberson 2022-4-1

Ah, I don't think there was any way any of us could have guessed you wanted to select in that order.

omar th 2022-4-1

actually its not exactly in that order for sure i changed it, but this approach worked in my assumption

thanks again

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Answer 2

Walter Roberson 2022-3-31

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A = [2;2;-3;4;5;6;7;-8;9;-6;5;4;-2;1;3;-9;8;7;4;-5;6;3;2;-1;4;-7;-8;5;-6];
parts = mat2cell(A, [7, 7, 7, 8], 1);
[B, C, D, E] = parts{:};
whos
  Name        Size            Bytes  Class     Attributes

  A          29x1               232  double              
  B           7x1                56  double              
  C           7x1                56  double              
  D           7x1                56  double              
  E           8x1                64  double              
  parts       4x1               648  cell                

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Walter Roberson 2022-3-31

在 MATLAB Online 中打开

Your desired outcome is not defined. Do you always want 4 blocks, and the first three of them should be equal, and the last should absorb any extra capacity ?

A = randi([-9 9], 35, 1);
nrow = size(A,1);
each = floor(nrow/4);
parts = mat2cell(A, [each, each, each, nrow - 3*each], 1);
[B, C, D, E] = parts{:};
whos
  Name        Size            Bytes  Class     Attributes

  A          35x1               280  double              
  B           8x1                64  double              
  C           8x1                64  double              
  D           8x1                64  double              
  E          11x1                88  double              
  each        1x1                 8  double              
  nrow        1x1                 8  double              
  parts       4x1               696  cell                