How do I read only numerical data and ignore other text from input file?

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Siddharth Sharma
Siddharth Sharma 2017-11-3
评论： Walter Roberson 2017-11-12
Input file looks like this. Is there a way to ignore the specifiers? Is there a way the program allocates variables as given in the file?
0, 1 !t0, y0
1 !tf
0.1 !h
1 !Euler Forward
  2 个评论
Siddharth Sharma
Siddharth Sharma 2017-11-11
Hi, these numbers are to be allotted to the variables next to the exclamation sign. This is just the input, I don't think the output matters but anyway, my code is supposed to numerically solve ODEs so the program will use Runge-Kutta 4th order algorithm(written in the code).

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回答（1 个）

Akira Agata
Akira Agata 2017-11-12
Is this what you would like to do?
% After textscan
C = {'0, 1 !t0, y0';...
'1 !tf';...
'0.1 !h';...
'1 !Euler Forward'};
% Extract numbers and store them in variables for each line
tmp = regexp(C{1},'[+-]?(\d+\.?\d*|\.\d+)','match');
t0 = str2double(tmp{1});
y0 = str2double(tmp{2});
tmp = regexp(C{2},'[+-]?(\d+\.?\d*|\.\d+)','match');
tf = str2double(tmp{1});
tmp = regexp(C{3},'[+-]?(\d+\.?\d*|\.\d+)','match');
h = str2double(tmp{1});
tmp = regexp(C{4},'[+-]?(\d+\.?\d*|\.\d+)','match');
EulerForward = str2double(tmp{1});

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