MATLAB: Parsing integers from directory list

directory integer parsingMATLAB

I have a directory with files names:

1_d
3_kk
56_rr

I need to parse the list numbers from the file names. I need to output a numerical array

[1 3 56]

is there a simple way to do it?

Best Answer

Hi!

What du you have? An array of strings or a cell array? Are the numbers always in front of the file name?

Suppose you have a cell array C, try using regexp:

C2 = regexp(C, '(\d*)', 'tokens');
C2 = cellfun(@(x) x{1}, C2);
numbers = cellfun(@(x) str2double(x), C2);

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MATLAB: I have an array with data(1,unknown).I want to split it number of rows but row wise not column wise as reshape do

The following would be one solution. But I'm not sure what to do when length of your data is not 5N (N = 1,2,3...).

% Your data
Data = [1,2,3,4,5,6,7,8,9,10,11,12,2,3,4];
% Concatenate every 5 elements
Data = reshape(Data,5,[])';
C = cellstr(num2str(Data));
C = cellfun(@(s) strrep(s, ' ', ''), C, 'UniformOutput', false);
Output = cellfun(@(x) str2double(x), C);

MATLAB: How to use cellstr() without losing whitespace character

Pay attention to the difference between the two last commands

>> c1={'1' '12' '123'}
c1 =
  1×3 cell array
    {'1'}    {'12'}    {'123'}
>> c2=char(c1)
c2 =
  3×3 char array
    '1  '
    '12 '
    '123'
>> c3=cellstr(c2)
c3 =
  3×1 cell array
    {'1'  }
    {'12' }
    {'123'}
>> c4=num2cell(c2,2)
c4 =
  3×1 cell array
    {'1  '}
    {'12 '}
    {'123'}

Best Answer

Related Solutions

MATLAB: I have an array with data(1,unknown).I want to split it number of rows but row wise not column wise as reshape do

MATLAB: How to use cellstr() without losing whitespace character

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