Using textscan with lines of different length

Question

Drach 2019-3-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/449573-using-textscan-with-lines-of-different-length

回答： Krishna Zanwar 2019-3-22

采纳的回答： Krishna Zanwar

Hello everyone,

I'm trying to read a .txt file with textscan. Here is a part of the file:

27-03-2018 12:21:21 -> Computing phases...

27-03-2018 12:21:21 -> Computing horizontal phase for camera (0,1,1) ...

27-03-2018 12:21:21 -> Unwrapping phase level 0 ... Done

27-03-2018 12:21:21 -> Unwrapping phase level 1 ... Done

================================================

27-03-2018 13:21:55 -> Exporting (23,1,1)

================================================

The file has several thousand lines. Essentially every line has date, time, an arrow and a message. The message can contain numbers and strings and can have any number of strings and numbers. The length of the lines is not known.

The file also contains lines of several "=" as you can see. It is not known when the lines of equal singns appear.

My question is now what my formatSpec has to look like. I have no idea what I got to with changing length of lines.

Thanks alot for any help!

Edit: I found this thread:

https://stackoverflow.com/questions/49003915/how-do-i-read-the-rest-of-a-line-of-a-text-file-in-matlab-with-textscan

It seems to solve my problem, I will try it.

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Guillaume 2019-3-12

It's easier for us if you actually attach a demo text file.

What output are you wanting out of that?

Personally, I'd just read the whole file in one go. A simple regular expression after that would allow you to extract date, time and text while ignoring all the ==== lines, if that's what you're after. The whole thing could be done in 3 lines.

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