清空筛选条件
清空筛选条件

How to read every nth line of a file

36 次查看（过去 30 天）
Shivik Garg
Shivik Garg 2016-7-13
编辑： Shivik Garg 2016-7-14
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

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2016-7-13
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 个评论
显示 1更早的评论
Walter Roberson
Walter Roberson 2016-7-13
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)];
Shivik Garg
Shivik Garg 2016-7-14
编辑：Shivik Garg 2016-7-14
It worked. Thanks a lot for you help

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Large Files and Big Data 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by