How to read input.txt?

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Yasuyuki Hamanaka
Yasuyuki Hamanaka 2021-8-24
评论： Walter Roberson 2021-8-25
Hello!
Would you tell me how to read .txt file like below.
aaaaaa
bbbbbb
1
200
2000
4129
4189
I would like to read first two lines as string and other lines as real.
I tried to use fscanf though, it doesn't work well.
Thank you.
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Yasuyuki Hamanaka
Yasuyuki Hamanaka 2021-8-24
I made mistake. I edited it. Thank you.
Stephen23
Stephen23 2021-8-24
@Yasuyuki Hamanaka: what integer do you expect the characters 'aaaaaa' to return ?

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Walter Roberson
Walter Roberson 2021-8-24
fid = fopen('input.txt');
textlines{1} = fgetl(fid);
textlines{2} = fgetl(fid);
numbers = cell2mat(textscan(fid, '%f'));
fclose(fid)
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Yasuyuki Hamanaka
Yasuyuki Hamanaka 2021-8-25
What I want to know seems to be function fgetl. I appreciate you.
Walter Roberson
Walter Roberson 2021-8-25
For future reference:
There is also the closely related function fgets() . The difference between fgetl() and fgets() is that fgetl() strips the line terminators off, but fgets() leaves them in.
So when the purpose is to copy a file, then fgets() is better because it includes the original line terminators in -- if the original line terminator was CR+LF then the CR+LF will both be present for fgets() and will make it into any file that you write them to fgetl() would remove the CR+LF, so fgetl() is better for the case where you are analyzing the content and don't want to have to worry all the time about whether the original had CR+LF or LF alone.

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更多回答（1 个）

dpb
dpb 2021-8-24
Are the string data pertinent or just in the way of returning the numeric data?
If the former, while you can make it work with low-level i/o such as fprintf, it's the hard way to go at it -- use
readcell instead.
If the latter and the text is (say) a header line and units or similar, use readtable

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