![0000 Screenshot.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/267533/0000%20Screenshot.png)
Calc of mean and standard deviation
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Hi. I have
A = [1,-1,0,6,8,9]
B = [1,-2,0,-6,8,9]
C = [-2,-1,0,6,8,9]
How can I calc the mean of three of them (excluding NaN) std and plot them in one graph?
The result should look like the photo. Maybe this is elementary question but I'm still learning. Thanks.
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Accepted Answer
Image Analyst
on 23 Jan 2020
Is this what you want:
A = [1,-1,0,6,8,9]
B = [1,-2,0,-6,8,9]
C = [-2,-1,0,6,8,9]
% Compute mean and std dev.
meanVec = mean([A; B; C], 'omitnan')
stdVec = std([A; B; C], 'omitnan')
% Plot everything
plot(A, 'r.-', 'LineWidth', 2, 'MarkerSize', 10);
hold on;
plot(B, 'g.-', 'LineWidth', 2, 'MarkerSize', 10);
plot(C, 'b.-', 'LineWidth', 2, 'MarkerSize', 10);
plot(meanVec, 'k.-', 'LineWidth', 2, 'MarkerSize', 10);
grid on;
legend('A', 'B', 'C', 'Mean', 'Location', 'northwest');
![0000 Screenshot.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/267533/0000%20Screenshot.png)
2 Comments
Image Analyst
on 24 Jan 2020
It's trivial to add it, and I expect you have already.
A = [1,-1,0,6,8,9]
B = [1,-2,0,-6,8,9]
C = [-2,-1,0,6,8,9]
% Compute mean and std dev.
meanVec = mean([A; B; C], 'omitnan')
stdVec = std([A; B; C], 'omitnan')
% Plot everything
plot(A, 'r.-', 'LineWidth', 2, 'MarkerSize', 10);
hold on;
plot(B, 'g.-', 'LineWidth', 2, 'MarkerSize', 10);
plot(C, 'b.-', 'LineWidth', 2, 'MarkerSize', 10);
plot(meanVec, 'k.-', 'LineWidth', 2, 'MarkerSize', 10);
plot(stdVec, 'm.-', 'LineWidth', 2, 'MarkerSize', 10);
grid on;
legend('A', 'B', 'C', 'Mean', 'Standard Deviation', 'Location', 'northwest');
![0000 Screenshot.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/267848/0000%20Screenshot.png)
More Answers (1)
John D'Errico
on 23 Jan 2020
Edited: John D'Errico
on 23 Jan 2020
It should look like what photo? The mind reading toolbox has never gotten past beta testing state, and the copy I have is full of bugs.
Hint: create ONE matrix, that is 3x6. Now can you use the functions mean and std on the matrix?
This points out the flaw in creating multiple variables, when one array will suffice.
3 Comments
John D'Errico
on 23 Jan 2020
Edited: John D'Errico
on 23 Jan 2020
Please stop answering with something that is purely a comment. You never even attached a picture to your answer. You clearly know how to make a comment, since you made one. And you can attach a picture to a comment.
But if you even admit a matrix would be helpful, then TRY IT!!!!!!! Make some effort.
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