how to save plots in a folder. named as figure1,Fi​gure2,Figu​re3,Figure​4?

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i have 40 list of people data
each data is having 2 data of age
i have used image below to explain it clearly
so from age data a1 4 graphs and a2 4 graphs
from 1 data i am getting 8 graphs..
i am facing difficulty to save graphs numbered as figure1,figure2 in a folder
a=dlmread('S11.txt')
freq=a(:,1)
Spam=a(:,2)
Spam=reshape(Spam,[1,21])
x = freq;
y = spam;
plot(x,y);
grid on
title('plot');
xlabel('freq');
ylabel('sparm');
is there any command which will find out no of figures already generated and then based on that save the figures
like this i have to plot for multiple sparameters ..how to save it as figure1 figure2 .figure 3 in jpg format in folder
2018a version

Accepted Answer

Voss
Voss on 18 May 2022
Edited: Voss on 18 May 2022
files = dir('*.txt');
files = fullfile({files.folder},{files.name});
for ii = 1:numel(files)
a=readmatrix(files{ii});
f = figure();
plot(a(:,1),a(:,2));
grid on
title('plot');
xlabel('freq');
ylabel('sparameter');
saveas(f,sprintf('figure%d.jpg',ii));
delete(f);
end
dir('*.jpg')
figure1.jpg figure2.jpg
  4 Comments
Voss
Voss on 19 May 2022
To take the first 500 elements of column 2 of a, convert it to a row vector, and store it as a:
a = a(1:500,2).';
If there are fewer than 500 elements, you'd have to augment to 500, if you always need it to be 500.

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