How to extract every repeated sequence line from text file using MATLAB

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POKA 2017-8-3

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/351355-how-to-extract-every-repeated-sequence-line-from-text-file-using-matlab

评论： per isakson 2017-8-4

Time(sec) 20.30
Type 1
Svid  slew  power used 
12.    0.33 -36dbm y
10     .38. -40dbm N
08.    0.40 -30dbm Y
Time(sec) 20.40
Type 2
Svid  slew  power used 
12.   0.46. -38dbm Y
06.   0.50. -32dbm Y
02.   0.42. -30dbm N
sequence repeats....

How to pull out all Type-1 SVID 12 row which is repeating (say after 10 line). How can I save it to new file so that I can manipulate for further processing. Any help is highly appreciated! POKA

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Stephen23 2017-8-3

回答（1 个）

KSSV 2017-8-3

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/351355-how-to-extract-every-repeated-sequence-line-from-text-file-using-matlab#answer_276570

在 MATLAB Online 中打开

You can get the indices of your string Type 1 and Svid1 using the below code:

fid = fopen('data.txt') ;
S = textscan(fid,'%s','delimiter','\n') ;
S = S{1} ;
fclose(fid) ;
%%gEt string Type 1
idx1 = find(not(cellfun('isempty', strfind(S, 'Type 1'))));   % lower then 2016b
% idx1 = contains(S,'Type 1') ;
% idx1 = find(idx==1) ;
% GEt string Svid
idx2 = find(not(cellfun('isempty', strfind(S, 'Svid'))));

Once you have indices you can extract what you want..

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Walter Roberson 2017-8-4

在 MATLAB Online 中打开

By default, \r is 'whitespace' for textscan() but strsplit() treats it as just another character.

strsplit() calls regexp(). You can go more directly:

 S = sprintf( '%s\r\n%s', 'A','B' );
 cac = regexp( S, '\r?\n', 'split');

per isakson 2017-8-4

在 MATLAB Online 中打开

It's more to it

>> cac = textscan( sprintf( '%s\r\n%s', 'A','B' ), '%s%s', ...
'Delimiter','\n', 'Whitespace','' )
cac = 
    {1x1 cell}    {1x1 cell}
>> double(cac{1}{:})
ans =
    65
>>