How to write a calculated number into a text file…!

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Loran 2014-9-14

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https://ww2.mathworks.cn/matlabcentral/answers/154700-how-to-write-a-calculated-number-into-a-text-file

评论： Image Analyst 2014-9-14

Hello,

I have a big text file, which I want first to find a specific “TIME” line in the text file and then add a calculated variable (which I have done it before) underneath that TIME?

For example: add calculated variable “b” after TIME 380.

…..

TIME 350

TIME 360

TIME 370

TIME 380

b

TIME 390

TIME 400

TIME 410

TIME 420

TIME 430

TIME 440

Thanks so much!

Loran

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Answer 1

Image Analyst 2014-9-14

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https://ww2.mathworks.cn/matlabcentral/answers/154700-how-to-write-a-calculated-number-into-a-text-file#answer_151627

Try fgetl() followed by strfind() to find the desired "TIME" line. Then, once you've found it call fgetl() to read the "b" line and use str2double to convert that string into a numerical variable that you can use to add be to whatever you want to add it to.

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Loran 2014-9-14

Thanks so much.

I am new to Matlab with very little experience! I tried but did not work. I am sure I did something wrong. I would appreciate if you can elaborate it more!

thanks.

Image Analyst 2014-9-14

You forgot to attach your code, and most importantly, the text file. Also let me know what time number and "b" that immediately follows it you want to extract - I don't know if there is just one b in there or if there are tons of b's in there and you just want one particular one.

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