MATLAB: Extract number from data file name

extraction filename

Hi, I have a list of data file name below :

Data_T2_31_4c_comb_1_9-10-11-12.mat

Data_T2_31_4c_comb_2_9-10-11-13.mat

…

Data_T2_31_4c_comb_3876_25-26-27-28.mat

I would like to extract the number in the 20th character, so that I will have a list of increasing integers [1 2 .. 3876]. Could you show me how to do that please ! Winn

Best Answer

s={'Data_T2_31_4c_comb_1_9-10-11-12.mat'
 'Data_T2_31_4c_comb_2_9-10-11-13.mat'}
out=regexp(s,'\d+','match')
out=str2double(cat(1,out{:}))

Related Solutions

MATLAB: How to construct a matrix with its column elements as matrix operations

Assuming your column vectors are stored in cell array C:

combs = num2cell(nchoosek(1:numel(C), 2), 2);
S = cellfun(@(comd) C{comb(1)} + C{comb(2)}, combs, 'UniformOutput', false);
M = [S{:}];

Or, if your column vectors are actually columns of a matrix M1:

combs = num2cell(nchoosek(1:size(M1, 2), 2), 2);
S = cellfun(@(comb) sum(M1(:, comb), 2), combs, 'UniformOutput', false);
M2 = [S{:}];

MATLAB: Simplifying a large nested for-loop

It sounds like a recursive problem to me.

What about something like

   function comb = looper(comb, IX, n, N)
     if n > length(comb)
        return;
     end
     for m = 1:N(n)
        comb(n)=IX(m,n);
        if consistent(comb)
          comb = looper(comb, IX, n+1, N);
        end
     end
   end

You could call it with something like:

N = [N1, N2, N3, ..., Nn];
comb = looper(0, IX, 1, N);
tot_dist = min(tot_dist(comb), tot_dist);

Best Answer

Related Solutions

MATLAB: How to construct a matrix with its column elements as matrix operations

MATLAB: Simplifying a large nested for-loop

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