MATLAB: Help with use of regular expression

regexp

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?

Best Answer

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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