How to read every nth line of a file
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Shivik Garg
il 13 Lug 2016
Modificato: Shivik Garg
il 14 Lug 2016
time,n0v_soma,n1v_soma,n2v_soma,n3v_dend
0,-70,-70,-66.5,-66.5
0.027,-69.9703,-69.9794,-66.4966,-66.4966
0.054,-69.9685,-69.9533,-66.4933,-66.4933
0.081,-69.9283,-69.9322,-66.49,-66.4899
0.108,-69.9588,-69.9385,-66.4866,-66.4866
0.135,-69.9422,-69.8965,-66.4833,-66.4833
0.162,-69.9058,-69.8943,-66.48,-66.48
0.189,-69.8465,-69.8618,-66.4767,-66.4766
0.216,-69.8505,-69.8258,-66.4734,-66.4733
0.243,-69.7855,-69.8011,-66.4701,-66.47
0.27,-69.7913,-69.7594,-66.4668,-66.4667
0.297,-69.7228,-69.7291,-66.4636,-66.4634
0.324,-69.6841,-69.7006,-66.4603,-66.4601
0.351,-69.6907,-69.7157,-66.4571,-66.4569
0.378,-69.6584,-69.7295,-66.4538,-66.4536
0.405,-69.5766,-69.7279,-66.4506,-66.4503
0.432,-69.5668,-69.6756,-66.4474,-66.447
0.459,-69.5396,-69.6777,-66.4442,-66.4437
0.486,-69.511,-69.6717,-66.441,-66.4404
0.513,-69.4808,-69.6523,-66.4378,-66.4371
0.54,-69.4632,-69.6325,-66.4346,-66.4339
0.567,-69.4605,-69.6169,-66.4314,-66.4306
0.594,-69.4398,-69.6346,-66.4282,-66.4273
0.621,-69.4638,-69.6245,-66.4251,-66.424
0.648,-69.4429,-69.5968,-66.4219,-66.4207
0.675,-69.4134,-69.5639,-66.4187,-66.4174
0.702,-69.3973,-69.5655,-66.4156,-66.4141
0.729,-69.3973,-69.5668,-66.4125,-66.4108
0.756,-69.3611,-69.6189,-66.4093,-66.4075
My file looks something like this. I want to read every 10th line of this and skip the header.
so
my array should look like this
C=[0.216,-69.8505,-69.8258,-66.4734,-66.4733;0.486,-69.511,-69.6717,-66.441,-66.4404;0.756,-69.3611,-69.6189,-66.4093,-66.4075];
and so on
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Walter Roberson
il 13 Lug 2016
Sometimes it is just easier to loop reading and discarding most lines and storing the ones you want.
But if you need it done in one step:
per_line = 5;
every_nth_line = 10;
fmt = [repmat('*%f', 1, per_line*(every_nth_line-1)), repmat('%f', 1, per_line)];
fid = fopen('YourFile.txt', 'rt');
datacell = textscan(fid, fmt, 'delimiter', ',\n', 'HeaderLines', 1, 'CollectOutput', 1);
fclose(fid);
C = datacell{1};
3 Commenti
Walter Roberson
il 13 Lug 2016
Sorry, minor typo. Change
fmt = [repmat('*%f', 1, per_line*(every_nth_line-1)), repmat('%f', 1, per_line)];
to
fmt = [repmat('%*f', 1, per_line*(every_nth_line-1)), repmat('%f', 1, per_line)];
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