How do I find specific values in a .txt file?

Question

Ryan 2021-2-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/732378-how-do-i-find-specific-values-in-a-txt-file

评论： Mathieu NOE 2021-2-1

Hello everybody,

I have a .txt file. And I need to find the key words in the text then pick the value next to the key words. Here is one part of this text file:

%% Define the target filter
freq_step = 0.2;	% Frequency step (GHz)
lowest_freq = 20;	% Lowest frequency of the whole frequency band (GHz)
mid_freq = 33;	% Middle frequency of the passband (GHz)
highest_freq = 45;	% Highest frequency of the whole frequency band (GHz)
pass_s11_max_tgt = -10;	% Target maximum S11 in the passband (dB)
pass_s11_min_tgt = -15;	% Target minimum S11 in the passband (dB)
pass_s21_tgt = -1;	% Target S21 in the passband (dB)
stop_s11_tgt = -1;	% Target S11 in the stopband (dB)
stop_s21_max_tgt = -15;	% Target maximum S21 in the stopband (dB)
stop_s21_min_tgt = -25;	% Target minimum S21 in the stopband (dB)

I need the values after "freq_step = ", "lowest_freq = ", "highest_freq = ". Could anyone help me with that?

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Answer 1

Mathieu NOE 2021-2-1

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/732378-how-do-i-find-specific-values-in-a-txt-file#answer_611378

在 MATLAB Online 中打开

hello

this code will extract the searched items and stote them in a table (taht you can save to excel if needed)

hope it helps

lines = readlines('Document1.txt');
for ci =1:numel(lines)
    line_str =  extractBefore(lines(ci),'='); % extract question number (with double quote)
    
    if strfind(line_str,'freq_step')
        Value1 =  str2num(extractBetween(lines(ci),'=',';')); % extract values and convert string to numerical
        
    elseif strfind(line_str,'lowest_freq')
        Value2 =  str2num(extractBetween(lines(ci),'=',';')); % extract values and convert string to numerical
        
    elseif strfind(line_str,'highest_freq')
        Value3 =  str2num(extractBetween(lines(ci),'=',';')); % extract values and convert string to numerical
   
    end
end
A = [Value1' Value2' Value3'];
T = array2table(A,    'VariableNames',{'freq step','lowest freq','highest freq'})
writetable(T,'test.xlsx')