How do I pull the specific data I need from a text file?

Question

Jessica Maxson 2018-1-16

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https://ww2.mathworks.cn/matlabcentral/answers/377503-how-do-i-pull-the-specific-data-i-need-from-a-text-file

回答： Harish Ramachandran 2018-2-19

mctan.txt

I have an output file from which I am trying to pull specific data and plot it. I added comments in the format "% FIRST LINE OF X VALUES" to the file for the sake of people looking at my question being able to see which values I am trying to pull, however these comments are not in the actual output file. I am trying to pull two specific blocks of values from this file, one of "x" values and one of "y" values, and plot them and while I know how to plot the data once I've extracted it, I am not sure how to pull the data correctly from the file. For those trying to help, the data I need to pull is near the end of the attached file. Any ideas are greatly appreciated!

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Answer 1

Harish Ramachandran 2018-2-19

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You can probably write your own parser and go through each line until you stumble upon the 'x' and 'y' parameters. Collect the data in a vector and then proceed to plot the 'x' and 'y' values.

A sample line parser for the txt file.

file = fopen('mctan.txt');
line = fgetl(file);
for i=1:6
     if any(line == 'x values')
        disp("x values need to be stored")
     elseif any(line == 'y values')
        disp("y values need to be stored")
    line = fgetl(file);
end
fclose(file);