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# Create a plot with a text file containing a matrix

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Mia on 9 Oct 2019
Edited: Adam Danz on 11 Oct 2019
I have a matrix that's been read into the program and I need to plot the mean and standard deviation over all users against time for the data.
Can someone help me figure out how to plot that?

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John Doe on 9 Oct 2019
How have you imported the data. What format is it in?
Need to see code and ideally attach the data if you can please. Then happy to answer.

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### Answers (1)

Adam Danz on 9 Oct 2019
Edited: Adam Danz on 11 Oct 2019
Assuming time varies by row and user varies by column, here's a demo you can follow.
% Create a matrix of measurements of users (columns) across time (rows)
m = randn(100,10).*(rand(1,10)*3) + randi(10,1,10);
% Compute the mean and standard dev for each column
mu = mean(m,1,'omitnan');
sd = std(m,[],1,'omitnan');
% Plot results
figure()
% show raw data
h1 = plot((1:numel(mu))-.2, m, 'k+', 'Color', [.7 .7 .7], 'MarkerSize',3, 'DisplayName','raw data');
hold on
% Show mean and std
h2 = errorbar(1:numel(mu), mu, sd, 'o', 'linewidth', 1.5, 'color', 'k', 'DisplayName', 'Mean & std');
% cosmetics
xlabel('User')
ylabel('Measurement (units)')
xlim([0,numel(mu)+1])
legend([h1(1),h2(1)])

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