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Plotting different sections of multiple arrays using a loop

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Bill
Bill on 9 Oct 2014
Commented: Iain on 9 Oct 2014
Hi,
I have multiple data files that I have extracted using a for loop, I can easily plot these files in the loop aswel.
The problem however is that for each file I only want to plot a snapshot of the data. does anyone know if this is possible to introduce in a loop.
My code to plot all the graphs is:
Time=linspace(1,3000,3000/(50*10^(-6)));
Files = dir(fullfile('C:blah blah/*.mat'));
filename = cell(length(Files),1);
data = cell(length(Files),1);
for k = 1:length(Files)
filename{k} = Files(k).name;
data{k} = load(filename{k});
figure;
plot(Time(1:length(data{k,1})),data{k,1});
title(filename(k))
end
but to reiterate i want to say plot first data points 1000-2000 for 1, 1-1001 for 2 etc the only similarity is that the data ranges I want to plot are the same. Is this possible?

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Answers (1)

Iain
Iain on 9 Oct 2014
Edited: Iain on 9 Oct 2014
Assuming your plot command is correct, all you need to do is modify it:
plot(Time(1:length(data{k,1})),data{k,1});
plot(Time(1:1000),data{k,1}(1:1000));

  2 Comments

Bill
Bill on 9 Oct 2014
yeah thanks but what happens if I want to plot say 1:1000 for k=1, but 501-1500 for k=2, 201-1200 for k=3 etc is this possible in a loop? Or should is just plot them all individually
Iain
Iain on 9 Oct 2014
You just need a function that tells you the first index to use, and a function that tells you the last index to use.
something like
first = [1 501 201 640 981 321];
first_index = first(k);
plot(Time(first_index:(first_index+999)),data{k,1}(first_index:(first_index+999)));
I am assuming that you want the same part of "Time" as you do data...

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