Split a row into several rows

Question

Olu adroit 2016-1-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/263779-split-a-row-into-several-rows

评论： Olu adroit 2016-1-14

采纳的回答： Stephen23

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Hi all, I am trying to split a single-row matrix say for example

A = [1,2,3,4,17,18,19,20,33,34,35,36,49,50,51,52,65,66]

into a multiple-row matrix B, the maximum number of columns in B being 5. I would expect to get something like

B = [1,2,3,4,17;18,19,20,33,34;35,36,49,50,51;52,65,66]

I tried using the reshape function as below but it's giving an error saying

Product of known dimensions, 5, not divisible into total number of elements, 18

Please any suggestion would be appreciated.

    % 
    % I would like to get
    % B = 1   2   3   4   17
    %     18  19  20  33  34
    %     35  36  49  50  51
    %     52  65  66
    %
    % code
    A = [1,2,3,4,17,18,19,20,33,34,35,36,49,50,51,52,65,66];
    B = reshape(A, 5, []);

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Answer 1

Stephen23 2016-1-14

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https://ww2.mathworks.cn/matlabcentral/answers/263779-split-a-row-into-several-rows#answer_206146

编辑：Stephen23 2016-1-14

在 MATLAB Online 中打开

A matrix cannot have gaps or missing values: every row must be the same length, just as every column must too. So you will have to join some values onto A before reshaping it:

>> N = 5;
>> reshape([A,nan(1,N-mod(numel(A),N))],[],N)
ans =
     1    17    33    49    65
     2    18    34    50    66
     3    19    35    51   NaN
     4    20    36    52   NaN

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Olu adroit 2016-1-14

Thanks for this Steve. What if I want to pad with 0 and not NaN? I subsequently exported the multi-row matrix as a csv file into Abaqus software, which is giving me error message because of the exported NaN. Thanks in advance.

Olu adroit 2016-1-14