如何在Octave中计算文本文件中的行数? [英] How to count the number of lines in a text file in Octave?

问题描述

也不要说fskipl，因为它不起作用！！！

And don't say fskipl because it doesn't work!!!

fskipl undefined.

推荐答案

您有fgetl吗?如果是这样，您可以执行以下小循环:

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);

否则，您可以进行一些黑客攻击，例如:

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是换行符的ASCII码.但这似乎不可靠，尤其是当您遇到使用回车而不是换行符的文件时.

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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