How to use textscan from the middle of a file.

Question

Fredrik 2011-11-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/22035-how-to-use-textscan-from-the-middle-of-a-file

Hi. I am not very used to textscan and I really do not understand the help text. I have a textfile with A lot of text before the actuall data starts: " HL) [EOH] [BOD] 20111006 0:00,1210,134,98,984,7.83,235,2.47," etcetra with more columns. 20111006 0:10,1209,135,98,989,5.83,234,6.47," is next row and so on.

How can I with textscan only get the time in the beginning and remove all text before data starts, and remove all data after the time.

Any suggestions?

Thank you!

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Fredrik 2011-11-23

Should be new row after HL) after [EOH] and [BOD]..

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Answer 1

Andrei Bobrov 2011-11-23

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/22035-how-to-use-textscan-from-the-middle-of-a-file#answer_29015

在 MATLAB Online 中打开

[EDIT]

for the case when nameyourfile.txt contains data in the form:

   '20111006 0:00,1210,134,98,984,7.83,235,2.47'
   '20111006 0:10,1209,135,98,989,5.83,234,6.47'
fid = fopen('w3.txt');
d = textscan(fid,'%8s %5s %*s');
fclose(fid);
out0 = [d{:}];
t = cellfun(@(x)strcmp(x(end),','),out0(:,2));
out0(t,2) = cellfun(@(x)['0' x(1:end-1)],out0(t,2),'un',0);
out = arrayfun(@(x)[out0{x,:}],(1:size(out0,1))','un',0);

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Fredrik 2011-11-23

That seems to help. I did though lie a little bit. The rows before my start is always 29 and some of them have more letters than just [EOH], forexample one line is" Data field 11,17,23,29,35,41,47,53,59,65,71,77,83,89,95,101,107,113,119,125,131,137,143,149,155,161,167,173,185,191: Quality(S/N*10)(LL to HL)"

So for some reason, not all the text before my actual data is removed...

Fredrik 2011-11-23