find certain numbers in txt file

Hi everyone i have a txt that looks like this :

% Theta(AOI) 0.00 Phi(AOI) 0.00

DHR

0.7470

ScatteringPts

1.36

Shadowing

0.000

Warnings

0.09

Errors

0.00

and repeats this sequence like 200 times and i want to keep only the number under shadowing and save it in a new txt and was wondering if there was a way to do it.

I am attaching the file if anyone wants to take a look at it.

Answer 1

[Jan]

FileName = '20220727_150919_results.txt';
S = fileread(FileName);
C = strtrim(strsplit(S, newline));
m = find(strcmp(C, 'Shadowing'));

NewFile = 'Output.txt';
[fid, msg] = fopen(NewFile, 'w');
assert(fid > 0, '%s', msg);
fprintf(fid, '%s\n', C{m + 1});
fclose(fid);

With modern Matlab versions:

FileName = '20220727_150919_results.txt';
S = readlines(FileName, 'WhitespaceRule', 'trim');
m = find(S == 'Shadowing');

NewFile = 'Output.txt';
writelines(S(m + 1), NewFile);

[lena kappa]

Thank you!!!