How to read every 7:th + i:th (i = 1,2,3..) line into an array

Hello good folks! Further below is an example of my data file which is in a matlab code file (.m). I want the data from the 6:th row below each date into an array that looks like this:

if true
  M = [13.67 0.02; 13.62 0.03; 13.60 0.02]
end

In other words, where the first row of M has the data of the 7:th line in the file, the second row has the data of the 15:th line of the file, and the third row has data from the 23:rd row of the file, and so on. So basically I want the information of every 7:th + i:th row where i = (1,2,3...).

If you could help me understand how to achieve this, I am eternally greatful.

This is example code of my file:

if true
1999 Oct 30
.......
1.0
13.03 (0.27)
13.87 (0.02)
13.87 (0.01)
13.67 (0.02)
13.65 (0.08)
1999 Oct 31
.......
2.0
13.00 (0.11)
13.80 (0.03)
13.80 (0.02)
13.62 (0.03)
13.58 (0.03)
1999 Nov 01
.......
3.0
13.03 (0.12)
13.80 (0.02)
13.79 (0.02)
13.60 (0.02)
13.56 (0.03)
end

//Oliver

[KSSV]

Where is your data? Is it in text file?

[Oliver Andersen]

It is in a matlab code file (.m). I can also copy it into a text file if necessary!

Answer 1

[KSSV]

Copy your data in a text file...

fid = fopen('data.txt','r') ;
S = textscan(fid,'%s','Delimiter','\n');
fclose(fid) ;
S = S{1} ;
S = S(7:8:end) ;
iwant  = cell2mat(cellfun(@str2num,S,'un',0))

[Jan]

Easier and safer:

S     = S(7:8:end);
iwant = str2double(S);

In opposite to str2num the function str2double accepts cell strings directly and does not call eval. But then the parenthesis are a problem.

S     = S(7:8:end);
S     = strrep(strrep(S, '(', ''), ')', '');
iwant = str2double(S);

[Oliver Andersen]

Thank you so much both of you! This helped me out tons! Much appreciated