How to split command signal arrays in command order sequence?

Question

jamin kong 2017-10-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/362091-how-to-split-command-signal-arrays-in-command-order-sequence

评论： jamin kong 2017-10-20

采纳的回答： Stephen23

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Hello I have example for this question.

A = [0 0 1 1 1 0 0 1 1 1 1 1 0 0 0 1 1 1 0 0];

then I wanna split this signal in order sequence like below

 a1 = [0 0];
 a2 = [1 1 1];
 a3 = [0 0];
 a4 = [1 1 1 1 1];
 a5 = [0 0 0];
 a6 = [1 1 1];
 a7 = [0 0];

It's important array number(1 ~ 7) because I will analize with order sequence.

help me anybody please..

and I built code for calculate order count number with imputing signal, I would like to attach a note for you.

 A = [0 0 1 1 1 0 0 1 1 1 1 1 0 0 0 1 1 1 0 0];
 a = diff(A);
 b = abs(a);
 c = cumsum(b);
 count_order_A = c(end) + 1;
 % Then you can return answer '7'

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Stephen23 2017-10-19

编辑：Stephen23 2017-10-19

@jamin kong: creating or accessing numbered variables, like a1, a2, a3, etc, is slow, complex, and buggy. You should avoid doing this, and simply learn how to use fast and efficient arrays with indexing. Read this to know more:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

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Answer 1

Stephen23 2017-10-19

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https://ww2.mathworks.cn/matlabcentral/answers/362091-how-to-split-command-signal-arrays-in-command-order-sequence#answer_286573

编辑：Stephen23 2017-10-19

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Use mat2cell and then cell array indexing to access the subvectors:

>> A = [0 0 1 1 1 0 0 1 1 1 1 1 0 0 0 1 1 1 0 0];
>> D = diff(find([1,diff(A),1]));
>> C = mat2cell(A,1,D);
>> C{:}
ans =
   0   0
ans =
   1   1   1
ans =
   0   0
ans =
   1   1   1   1   1
ans =
   0   0   0
ans =
   1   1   1
ans =
   0   0
>>

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jamin kong 2017-10-20

Thank you for your awesome code!!

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Answer 2

Guillaume 2017-10-19

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https://ww2.mathworks.cn/matlabcentral/answers/362091-how-to-split-command-signal-arrays-in-command-order-sequence#answer_286572

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I'm not entirely sure what you're asking, but if you want to split that vector, it's simply:

a = mat2cell(A, 1, diff([0, find(diff(A)), numel(A)]));
celldisp(a)

Note that this creates a cell array of vectors, that you can easily access with a{1}, a{2}, etc. Never ever create numbered variables as your a1, a2, ... It's dead easy to iterate over the elements of a cell array, it's hard to do the same with numbered variables.