Extract only numbers from a text file with Matlab

Question

K. Taieb 2020-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/556870-extract-only-numbers-from-a-text-file-with-matlab

评论： K. Taieb 2020-7-1

In my txt file I have many lines with the following form:

I want to extract only the numbers that are between “ ” and after and only after x= and y=.

<Point x="-1.16804" y="-0.18000" z="1.60000" i="0.000000" j="0.000000" k="1.000000" u="1.000000" v="0.000000" w="0.000000" />
<Point x="-6.54428" y="-0.12000" z="1.60000" i="0.000000" j="0.000000" k="1.000000" u="1.000000" v="0.000000" w="0.000000" />
<Point x="-0.68936" y="-0.12000" z="1.60000" i="0.000000" j="0.000000" k="1.000000" u="1.000000" v="0.000000" w="0.000000" />
<Point x="-6.85390" y="-0.06000" z="1.60000" i="0.000000" j="0.000000" k="1.000000" u="1.000000" v="0.000000" w="0.000000" />

Can anyone help me?

Thank you.

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Answer 1

Walter Roberson 2020-6-29

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I recommend using regexp with named tokens and the 'names' option. For example

parts = regexp(S, 'x="(?<x>[^"])"\s+y="(?<y>[^"])', 'names')

parts would then be a struct array of character vectors with fields x and y

x = str2double({parts.x} );
y = str2double({parts.y} );

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Walter Roberson 2020-6-30

str = fileread('code_trajectoire.txt');
parts = regexp(str, 'x="(?<x>[^"]+)"\s+y="(?<y>[^"]+)', 'names');
x=str2double({parts.x});
y=str2double({parts.y});