% Read original data file:
M = dlmread('remaining particles total.txt','\t');
H = min(M(:,1)):max(M(:,1));
[X,Y] = ismember(H,M(:,1));
assert(all(X),'Some hour values are missing')
% Write new data file:
fid = fopen('newfile.txt','wt');
fprintf(fid,'%d\t%d\n',M(Y,:).');
fclose(fid);
This creates the following new text file:
0 814
1 745
2 660
3 539
4 420
5 355
6 303
... lots here
1821 0
1822 0
1823 0
1824 0
1825 0
