how to extract data from ascii file?
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i have been given ascii file ..
how to read data from it and plot the graphs
in this file around 2000 data is present ...and i need only 1001 data in such a way that i don't lose the entire data only some of them.
for example from freq=8-12GHz there are data like
freq parameter
8 -0.00000003
8.001 -0.2233652
8.002 -2.0000012
;
;
10.222 -2.22333
;
;
12 -2.0001123
so basically from 8-12 GHz all the data but losing very few data
2018a version
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Respuestas (1)
Voss
el 25 de Mayo de 2022
data = readmatrix('qwer.txt')
plot(data(:,1),data(:,2),'.-')
"in this file around 2000 data is present ...and i need only 1001 data"
data = data(1:2:end,:) % keep rows 1, 3, 5, ...
hold on
plot(data(:,1),data(:,2),'or')
3 comentarios
Voss
el 25 de Mayo de 2022
Please see this answer:
https://www.mathworks.com/matlabcentral/answers/57446-faq-how-can-i-process-a-sequence-of-files#answer_69523
You can alter the code to read just the files you want.
Voss
el 25 de Mayo de 2022
For instance, you might store Freq and Sparamters from the files in separate fields in the struct array returned from dir:
files = dir('*.txt');
disp({files.name});
files = files(1:2:end); % just keep every other file: files(1), files(3), ...
disp({files.name});
for ii = 1:numel(files)
temp = readmatrix(files(ii).name);
files(ii).xdata = temp(:,1);
files(ii).ydata = temp(:,2);
end
plot_args = [{files.xdata}; {files.ydata}];
plot(plot_args{:});
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