How to read input.txt?

Question

Yasuyuki Hamanaka 2021-8-24

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https://ww2.mathworks.cn/matlabcentral/answers/1439989-how-to-read-input-txt

评论： Walter Roberson 2021-8-25

采纳的回答： Walter Roberson

input.txt

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 2021-8-24

I made mistake. I edited it. Thank you.

Stephen23 2021-8-24

@Yasuyuki Hamanaka: what integer do you expect the characters 'aaaaaa' to return ?

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Answer 1

Walter Roberson 2021-8-24

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https://ww2.mathworks.cn/matlabcentral/answers/1439989-how-to-read-input-txt#answer_773839

在 MATLAB Online 中打开

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 2021-8-25

What I want to know seems to be function fgetl. I appreciate you.

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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