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How to loop through multiple text files and make plot for each one in a single script?

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Andrew Lackey
Andrew Lackey on 24 Sep 2021
Commented: Andrew Lackey on 24 Sep 2021
I have 5 text files that have the same exact variables and column formats. The txt. files are named a1.txt, a2.txt, etc. I have a script that solves for a velocity value as every x coordinate in the txt file. I would like to run all 5 txt files and then plot their different velocity function into one figure, so that I can compare. Here is the code I have so far:
%Open and read txt file
fid = fopen('Test.txt','rt');
fgetl(fid);
data = fscanf(fid,'%f',[7, Inf]);
%Grab variables from txt file
s = data(:,1);
x = data(:,2);
%Calculating V
%EXAMPLE EQUATION
v = 2*s
figure
plot(x,v,'Color',[0,0.7,0.9])
title('Test Plot')
xlabel('x')
ylabel('v')
Now what I would like to do is create a loop that reads 5 txt files in my directory, then create 5 different plots within 1 figure

Accepted Answer

KSSV
KSSV on 24 Sep 2021
Edited: KSSV on 24 Sep 2021
txtFiles = dir('*.txt') ;
N = length(txtFiles) ;
figure
hold on
for i = 1:N
%Open and read txt file
fid = fopen(txtFiles(i).name,'rt');
fgetl(fid);
data = fscanf(fid,'%f',[7, Inf]);
%Grab variables from txt file
s = data(:,1);
x = data(:,2);
%Calculating V
%EXAMPLE EQUATION
v = 2*s
plot(x,v)
end
title('Test Plot')
xlabel('x')
ylabel('v')
legend
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