MATLAB: How to read only a specific lines from txt file and store as array

read filetext filetextscan

Hello .
I have some data in attached file and i want to take only the data between X and Y an store it as array in MATLAB.
How can i do it ?
I know there are already similar threads but most of them doesnt contain comments to the codes so i coudnot get what i want.
Thanks

Best Answer

This is easy and efficient with textscan:
opt = {'HeaderLines',17,'CollectOutput',true};
fmt = repmat('%f',1,5);
[fid,msg] = fopen('example.txt','rt');
assert(fid>=3,msg)
C = textscan(fid,fmt,opt{:});
fclose(fid);
M = C{1}
Giving:
M =
            0            5            5   -5.305e-05    -5.67e-12
        1e-07            0            0    -0.001346    -9.39e-09
        2e-07            0            0     0.001321    8.899e-09
        3e-07            0            0    -0.000177   -1.376e-09
        4e-07            0            0    -0.001265   -8.834e-09
        5e-07            0            0    -0.000514   -3.687e-09
        6e-07            0            0    0.0002366    1.459e-09
        7e-07            0            0    0.0009872    6.606e-09
        8e-07            0            0    0.0009067    6.053e-09
        9e-07            0            0   -0.0002417   -1.822e-09
        1e-06            0            0     -0.00139   -9.698e-09
      1.1e-06            0            5          0.3   -8.179e-11
      1.2e-06            0            5          0.3    3.352e-11
      1.3e-06            0            5          0.3   -4.139e-11
      1.4e-06            0            5          0.3   -9.998e-11
      1.5e-06            0            5          0.3   -6.439e-11
      1.6e-06            0            5          0.3   -2.881e-11
      1.7e-06            0            5          0.3    6.771e-12
      1.8e-06            0            5          0.3    1.787e-11
      1.9e-06            0            5          0.3   -4.478e-11
        2e-06            0            5          0.3   -1.074e-10
      2.1e-06            5            0       0.2999   -3.169e-10
      2.2e-06            5            0       0.2999   -5.483e-10
      2.3e-06            5            0       0.2999    -5.55e-10
      2.4e-06            5            0       0.2999   -4.285e-10
      2.5e-06            5            0       0.2999    -3.02e-10
      2.6e-06            5            0          0.3   -1.755e-10
      2.7e-06            5            0          0.3   -1.304e-10
      2.8e-06            5            0          0.3    -2.51e-10
      2.9e-06            5            0       0.2999   -3.717e-10
        3e-06            5            0       0.2999   -4.923e-10
      3.1e-06            5            5     0.008347    -8.29e-12
      3.2e-06            5            5     0.005635   -9.013e-12
      3.3e-06            5            5     0.003308    2.125e-12
      3.4e-06            5            5     0.002145    3.311e-12
      3.5e-06            5            5     0.001663   -1.328e-12
      3.6e-06            5            5      0.00118   -5.966e-12
      3.7e-06            5            5     0.000698    -1.06e-11
      3.8e-06            5            5    0.0002156   -1.524e-11
      3.9e-06            5            5   -9.295e-05   -7.987e-12
        4e-06            5            5   -0.0002999    6.227e-12
      4.1e-06            0            0   -0.0005739   -3.378e-09
      4.2e-06            0            0     0.000453    2.323e-09
      4.3e-06            0            0    -0.001431   -8.135e-09
      4.4e-06            0            0   -0.0003192   -1.965e-09
      4.5e-06            0            0    0.0007925    4.205e-09
      4.6e-06            0            0     0.001314    7.097e-09
      4.7e-06            0            0    0.0006017    3.145e-09
      4.8e-06            0            0   -0.0001101   -8.069e-10
      4.9e-06            0            0   -0.0008218   -4.759e-09
        5e-06            0            0    -0.001534    -8.71e-09
>>
If the number of header lines are not fixed and vary between files, then you can use fgets in a while loop until you get to an easily identifiable line, then call textscan afterwards.
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