How to read lines from cell

Question

A-Rod 2024-7-5，15:39

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https://ww2.mathworks.cn/matlabcentral/answers/2134831-how-to-read-lines-from-cell

评论： A-Rod 2024-7-10，13:35

采纳的回答： Stephen23

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this time I'm trying to process data from a .txt file.

my goal is to extrat the information at specific lines.

I load my file

temp3 = regexp(fileread('DT_Diagra_ScanTool_DT62234_T0410_SHAP_001.txt'), '\r?\n', 'split')';

I got a 680x1 cell

I made and index to find the line in whic is the value I wnat.

idc = strfind(temp3,'PID 01');
idx = ~cellfun('isempty',idc);

is there any way to get all the '0' and '1' in that row?

after that I will also need to get the next 4 lines below and end up getting below values

0000 0000

0000 0111

1110 0101

as always any feedback will be high appreciated

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dpb 2024-7-6，13:29

As always, attach a sample text file itself...more than likely you can read the file directly avoiding the cells, but without the file to work with, we're shooting in the dark...

A-Rod 2024-7-8，12:15

T04102.txt

my bad, please find attached the file.

anyother comment please let me know.

thanks

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Answer 1

Stephen23 2024-7-8，20:11

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T04102.txt

S = readlines('T04102.txt');
X = find(startsWith(S,'PID 01'));
F = @(x) regexp(S(x:x+3),'[01]{4}\s+[01]{4}','once','match');
C = arrayfun(F,X, 'uni',0);
C{:}
ans = 4x1 string array
    "1000 0001"
    "0000 0100"
    "0000 0000"
    "0000 0000"
ans = 4x1 string array
    "0000 0000"
    "0000 0111"
    "1110 0101"
    "1110 0101"

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A-Rod 2024-7-10，13:35

it works, thanks a lot Stephen23

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Answer 2

Matlab Pro 2024-7-7，9:22

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Hi @A-Rod

As @dpb commented - the need to attach the raw data so it will help all of us to debug

Anyhow -I have imitated your data:

Look at the solution below

I assume that temp3 is a cellarray

I have used "contains" function instead of "strfind"

The rest - extract relevant data

% Imitating the READ output of the file
temp3 = repmat({''}, 680,1);
temp3{215} = 'PID 01000 000MIL on; fault code entries';
temp3{216} = '0000 0100';
temp3{217} = '0000 0000';
temp3{218} = '0000 0000Monitor status since DTCs cleared';
% Extracting data
idx = cell2mat(cellfun(@(x) contains(x, 'PID 01'),temp3,'uni',0));
i1 = find(idx);
for iLine = 0:3
    re = regexp(temp3{i1+iLine},'\d+\s+\d+','match');
    line1 = re{1}; % get all the '0' and '1'  in that row
    disp(line1);
end