Help with use of regular expression

Question

ely may 2015-12-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/259910-help-with-use-of-regular-expression

编辑： Walter Roberson 2015-12-14

Problem: I have a cell array of strings

TrajLocationCompact(1, 3).locationIdCompact1 
ans = 
    '1 1 1 1 1 32'
    '29 7 1 1 2 2 2 1 1 29'
    '2 1 1 2 1 1 1 1 1 1 1'
    '29 29 29 39 39 29'
    '29 29 37 29 29 29 29'
    '29 3 2 2 1 2 1 1 1 1 1 2'
    '29 3 1 1 2 1 1 2 1 2 1 29'
    '3 1 1 2 1 1 2 1 1 1'
    '29 29 29 29 29 29 29 29 29 1 2 2 16 5 1 1 2 1'
    '29 29'
    '29'

I want to trasform it in this way

    '1 1 1 1 1 32'  -->  1 32
    '29 7 1 1 2 2 2 1 1 29'  --> 29 7 1 2 1 29
    '2 1 1 2 1 1 1 1 1 1 1'  --> 2 1 2 1
    '29 29 29 39 39 29' --> 29 39 29
    '29 29 37 29 29 29 29' --> 29 37 29
    '29 3 2 2 1 2 1 1 1 1 1 2'  --> 29 3 2 1 2 1 2
    '29 3 1 1 2 1 1 2 1 2 1 29' --> 29 3 1 2 1 2 1 29
    '3 1 1 2 1 1 2 1 1 1' --> 3 1 2 1 2 1
    '29 29 29 29 29 29 29 29 29 1 2 2 16 5 1 1 2 1'  --> 29 1 2 16 5 1 2 1
    '29 29' --> 29
    '29' --> 29

Can you help me to find a regular expression that do it?

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Answer 1

Stephen23 2015-12-11

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https://ww2.mathworks.cn/matlabcentral/answers/259910-help-with-use-of-regular-expression#answer_202954

编辑：Stephen23 2015-12-11

在 MATLAB Online 中打开

Your example indicate that you want to convert these string numbers to numeric, and then collect the runs of one value together into one element. This is easy using diff:

>> C = {'1 1 1 1 1 32','29 7 1 1 2 2 2 1 1 29'};
>> D = cellfun(@(s)sscanf(s,'%f'),C,'UniformOutput',false);
>> E = cellfun(@(v)v([true;diff(v)~=0]),D,'UniformOutput',false);
>> E{:}
ans =
    1
   32
ans =
   29
    7
    1
    2
    1
   29

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Joseph Cheng 2015-12-11

在 MATLAB Online 中打开

to expand on Stephen's you can write a function as such

function cellout = mycellfun(cellin)
   numbers = str2num(cellin);
   points = [1 find(diff(numbers)~=0)+1];
   cellout = num2str(numbers(points));
end

and use it on your data

test = cellfun(@mycellfun,temp,'uniformoutput',false)

ely may 2015-12-14

编辑：Walter Roberson 2015-12-14

在 MATLAB Online 中打开

I have another doubt: for example,

C = {'674 674 719 618 631 618 631 618 618 631 618 618 674 674'};

using the code I obtain [674;719;618;631;618;631;618;631;618;674]. Now I want to compact the value consecutive that are repeated one more time including them in bracket

[674;719;618;631;618;631;618;631;618;674] --> [674 719 (618 631) 618 674]

How can I do? Have I to use regolar expression?

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