Extract only numbers from a text file

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

Answer 1

[Paolo]

 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,[]);

[nanmi51]

That did it!! Thank you so much Paolo.

[Paolo]

You are welcome :)

[nanmi51]

Just one last question, it seems like if those two numbers were negative, the output is empty. I tried the following line, and the result was an empty cell.

s.CircleByCenterPerimeter(center=(-11.7509, 5.2936), point1=(-11.6094, 5.2936))

[Paolo]

I've updated the answer. Also note that if you need to do numerical calculations with the data you will need to convert data to double using str2double.

[nanmi51]

Awesome, that worked. Yes, I will need to subtract the two numbers, and the result represents the radius of the circle.

[nanmi51]

Hi again. What if I wanted one the two remaining numbers too ?

[Paolo]

Which of the two? :)

Answer 2

[firas firas]

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)'}