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如何计算Octave中文本文件的行数？

发布于 2024-12-21 18:18:53 字数 75 浏览 2 评论 0原文

并且不要说 fskipl 因为它不起作用！

fskipl 未定义。

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梦里梦着梦中梦 2024-12-28 18:18:53

你有fgetl吗？如果是这样，你可以做这个小循环：

f = fopen('myfile.txt', 'rt');
ctr = 0;
ll = fgetl(f);
while (!isnumeric(ll)) %# fgetl returns -1 when it hits eof. But you can't do ll != -1 because blank lines make it barf
    ctr = ctr+1;
    ll = fgetl(f);
end
fclose(f);

否则，你可以做一些 hack，比如：

f = fopen('myfile.txt', 'rb');
ctr = 0;
[x, bytes] = fread(f, 8192); %# use an 8k intermediate buffer, change this value as desired
while (bytes > 0)
    ctr = ctr + sum(x == 10); %# 10 is '\n'
    [x, bytes] = fread(f, 8192);
end
fclose(f);

10 是换行符的 ASCII 代码。但这似乎不可靠，特别是当您遇到使用回车符而不是换行符的文件时。

Do you have fgetl? If so, you can do this little loop:

f = fopen('myfile.txt', 'rt');
ctr = 0;
ll = fgetl(f);
while (!isnumeric(ll)) %# fgetl returns -1 when it hits eof. But you can't do ll != -1 because blank lines make it barf
    ctr = ctr+1;
    ll = fgetl(f);
end
fclose(f);

Otherwise, you could do some hack like:

f = fopen('myfile.txt', 'rb');
ctr = 0;
[x, bytes] = fread(f, 8192); %# use an 8k intermediate buffer, change this value as desired
while (bytes > 0)
    ctr = ctr + sum(x == 10); %# 10 is '\n'
    [x, bytes] = fread(f, 8192);
end
fclose(f);

10 is the ASCII code for the newline character. But this seems unreliable, especially if you come across a file that uses carriage return instead of newline.

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