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Extract only numbers from a text file

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nanmi51
nanmi51 on 12 Jul 2018
Answered: firas firas on 1 Dec 2020
I have a text file that contains a series of lines where each line is of the following form: s.CircleByCenterPerimeter(center=(9.7593, 11.2643), point1=(9.8851, 11.2643))
I would like to extract just the first and third numbers from this line of text, and therefore from each line in the text file.
I tried a couple of things using textread(), but I couldn't figure out how to do it.
Any input would be much appreciated. Thank you

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Accepted Answer

Paolo
Paolo on 12 Jul 2018
Edited: Paolo on 12 Jul 2018
str = 's.CircleByCenterPerimeter(center=(9.7593, 11.2643), point1=(9.8851, 11.2643))';
regexp(str,'(?<=\()-?\d+\.?\d+','match')
For your text file:
raw = fileread('yourfile.txt');
data = regexp(raw,'(?<=\()-?\d+\.?\d+','match')
data = reshape(data,2,[]);

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nanmi51
nanmi51 on 12 Jul 2018
Awesome, that worked. Yes, I will need to subtract the two numbers, and the result represents the radius of the circle.
nanmi51
nanmi51 on 13 Jul 2018
Hi again. What if I wanted one the two remaining numbers too ?

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More Answers (1)

firas firas
firas firas on 1 Dec 2020
You could include the other two numbers as well:
regexp(str, '\d+?\.?\d+(?=))|(?<=\()\d+\.?\d+' , 'match')
ans =
1×4 cell array
{'9.7593'} {'11.2643)'} {'9.8851'} {'11.2643)'}

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