Modify a text file

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David
David 2021-11-16
评论： Rik 2021-11-17
Hello,
I want to open an existing text file, replace the number of "4.500000e-001" in the third column from line06 to line16 to another number (for example, 0.8), save the file.
The number in the third column may have different values.
Any help appreciated
Best regards!
LINE01: MDF=4
LINE02: 8
LINE03: 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000
LINE04: 2 -1.000000e+002 1.000000e+000 1.000000e+000 6.000000e+000
LINE05: 16 88 99 1 x temp mech snow alt sol emb ooo rrr rdr iut
LINE06: 1 -0.000000e+000 4.500000e-001 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000
LINE07: 2 -1.000000e+000 4.500000e-001 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000
LINE08: 3 -2.000000e+000 4.500000e-001 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000
LINE09: 4 -3.000000e+000 4.500000e-001 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000
LINE10: 5 -4.000000e+000 4.500000e-001 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000
LINE11: 6 -5.000000e+000 4.500000e-001 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000
LINE12: 7 -6.000000e+000 4.500000e-001 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000
LINE13: 8 -7.000000e+000 4.500000e-001 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000
LINE14: 9 -8.000000e+000 4.500000e-001 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000
LINE15: 10 -9.000000e+000 4.500000e-001 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000
LINE16: 11 -1.000000e+001 4.500000e-001 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000
LINE17: 6
LINE18: 11 31 41 61 81 98

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回答（1 个）

Chunru
Chunru 2021-11-17
Ran in:
% Assume that your text file is data.txt
s = fileread("data.txt");
s = strrep(s, '4.500000e-001', '0.8000');
fid = fopen('data1.txt', 'wt');
fprintf(fid, '%s', s);
fclose(fid);
type data1.txt
INE01: MDF=4 LINE02: 8 LINE03: 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000 LINE04: 2 -1.000000e+002 1.000000e+000 1.000000e+000 6.000000e+000 LINE05: 16 88 99 1 x temp mech snow alt sol emb ooo rrr rdr iut LINE06: 1 -0.000000e+000 0.8000 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000 LINE07: 2 -1.000000e+000 0.8000 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000 LINE08: 3 -2.000000e+000 0.8000 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000 LINE09: 4 -3.000000e+000 0.8000 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000 LINE10: 5 -4.000000e+000 0.8000 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000 LINE11: 6 -5.000000e+000 0.8000 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000 LINE12: 7 -6.000000e+000 0.8000 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000 LINE13: 8 -7.000000e+000 0.8000 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000 LINE14: 9 -8.000000e+000 0.8000 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000 LINE15: 10 -9.000000e+000 0.8000 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000 LINE16: 11 -1.000000e+001 0.8000 1 1 0.000000e+000 1.000000e+000 1.000000e+000 1.000000e+000 LINE17: 6 LINE18: 11 31 41 61 81 98
  1 个评论
Rik
Rik 2021-11-17
Note that fileread might not properly deal with UTF-8. That is probably not relevant in this case (as fopen should only default to UTF-8 in cases where fileread correctly deals with it), but it is something you should be aware of.

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