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I have to make a program that goes through a text file and extracts numerical values, I am having a hard time extracting those numbers, here is what I have so far. The text file also has a lot if letters associated with it to

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Shawntae Harris
Shawntae Harris 2020-7-22
编辑：per isakson 2020-7-22
Here is the text file
Shawntae Harris
Shawntae Harris 2020-7-22
I need the tempreture of 2 1,3,4 are not needed
Walter Roberson
Walter Roberson 2020-7-22
MATLAB does not permit us to copy and paste pictures of code or text and have them processed as text.
Walter Roberson
Walter Roberson 2020-7-22
So the lines for '2 FAIL OPEN_CIRCUIT' should be located? And is it the 22.8125 that you need, or the 100 0.00 on the next line that you need?
Shawntae Harris
Shawntae Harris 2020-7-22
the tempretures need to be located so yes the 22.8125 but only the ones associated with the "2 FAIL-"
Shawntae Harris
Shawntae Harris 2020-7-22
also this is just a picture of the text file the text file is an actual .txt file

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Walter Roberson
Walter Roberson 2020-7-22

0 个投票

filename = 'HypothesisTest2.txt';
S = fileread(filename);
temperatures = str2double( regexp(S, '^(?<=2 FAIL OPEN_CIRCUIT Int ')[\d.]+', 'match') );

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Shawntae Harris
Shawntae Harris 2020-7-22
I am having a problem with the bracket before the backslash by d,+'
here is the error
temperatures = str2double( regexp(S, '^(?<=2 FAIL OPEN_CIRCUIT Int ')[\d.]+', 'match') );
Error: Unbalanced or unexpected parenthesis or
bracket.
Walter Roberson
Walter Roberson 2020-7-22
temperatures = str2double( regexp(S, '^(?<=2 FAIL OPEN_CIRCUIT Int )[\d.]+', 'match') );
Shawntae Harris
Shawntae Harris 2020-7-22
I do have a problem as it returns an array of NaN. I think this is due to the fact that there are cell array of cell arrays.
Walter Roberson
Walter Roberson 2020-7-22
If you were to post an actual file instead of an image of a file, I could test...
Oh, I do see one problem:
temperatures = str2double( regexp(S, '^(?<=2 FAIL OPEN_CIRCUIT Int )[\d.]+', 'match', 'lineanchors') );

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Mohammad Sami
Mohammad Sami 2020-7-22
编辑：Mohammad Sami 2020-7-22

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Assuming the pattern shown in your picture. Ignore line 1, line 2& line 3 form a repeating pattern.
I would suggest read the entire file first. Then we split it by line. Then put the line following line 2 pattern together and same for line3.
file = 'filename.txt';
fid = fopen(file,'r');
rawtxt = fread(fid,'*char')';
rawtxt = splitlines(rawtxt);
line2s = rawtxt(2:2:end);
line3s = rawtxt(3:2:end);
line2txt = strjoin(line2s,newline);
line3txt = strjoin(line3s,newline);
out2 = textscan(line2txt,'%f FAIL OPEN_CIRCUIT Int %f degC');
out3 = textscan(line3txt,'%f %f W/m^2');

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Shawntae Harris
Shawntae Harris 2020-7-22
I would need it to be a for loop as the text file can vary for sizes

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