Reshape a row vector and convert it to a cell array

Question

hmhuang 2021-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/1588034-reshape-a-row-vector-and-convert-it-to-a-cell-array

评论： Image Analyst 2021-11-16

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I have a row vector as the following:

x = [1:10, 101:110, 11:20, 111:120]

Now I want to convert it to a 2-by-2 cell array C, where

C(1,1) = {[1:10]}
C(1,2) = {[11:20]}
C(2,1) = {[101:110]}
C(2,2) = {[111:120]}

How can I achieve this?

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Answer 1

Chunru 2021-11-16

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x = [1:10, 101:110, 11:20, 111:120];
x = reshape(x, [20, 2])';
C = mat2cell(x, [1 1], [10 10])'
C = 2×2 cell array
    {[                   1 2 3 4 5 6 7 8 9 10]}    {[          11 12 13 14 15 16 17 18 19 20]}
    {[101 102 103 104 105 106 107 108 109 110]}    {[111 112 113 114 115 116 117 118 119 120]}

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Answer 2

Image Analyst 2021-11-16

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Why do you want to do that?? That kind of situation does not call for a slow and inefficient cell array. You could simply use a 2-D double array:

C = reshape(x, [], 10);

Cell arrays are used for situations like where the arrays in each cell are not all of the same size. See the FAQ:

https://matlab.fandom.com/wiki/FAQ#What_is_a_cell_array.3F

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hmhuang 2021-11-16

@Image Analyst May I ask how to make x = [1:10, 101:110, 11:20, 111:120] to be x = [1:10, 11:20; 101:110, 111:120] by using reshape or some MATLAB built-in function?

Image Analyst 2021-11-16

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@hmhuang, for that, try this:

x = [1:10, 101:110, 11:20, 111:120];
C = reshape(x, 10, [])';
Codd = C(1:2:end,:);
Ceven = C(2:2:end,:);
Codd = reshape(Codd', 20, [])';
Ceven = reshape(Ceven', 20, [])';
x = [Codd; Ceven]
x = 2×20
     1     2     3     4     5     6     7     8     9    10    11    12    13    14    15    16    17    18    19    20
   101   102   103   104   105   106   107   108   109   110   111   112   113   114   115   116   117   118   119   120