# Calc of mean and standard deviation

조회 수: 2 (최근 30일)
Kofial 2020년 1월 23일
댓글: Image Analyst 2020년 1월 24일
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.

댓글을 달려면 로그인하십시오.

### 채택된 답변

Image Analyst 2020년 1월 23일
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');
##### 댓글 수: 2없음 표시없음 숨기기
Kofial 2020년 1월 23일
Yesss. Only with adding std in the plot as well. Thank you!
Image Analyst 2020년 1월 24일
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');

댓글을 달려면 로그인하십시오.

### 추가 답변 (1개)

John D'Errico 2020년 1월 23일
편집: John D'Errico 2020년 1월 23일
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.
##### 댓글 수: 3이전 댓글 1개 표시이전 댓글 1개 숨기기
John D'Errico 2020년 1월 23일
편집: John D'Errico 2020년 1월 23일
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.
Kofial 2020년 1월 23일
You don't have to be mean!!! Organizing in a matrix it's only the first step and doesn't help much for the total result. I can't visualize how to plot them. That's the most important.

댓글을 달려면 로그인하십시오.

### 카테고리

Help CenterFile Exchange에서 Annotations에 대해 자세히 알아보기

R2019a

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by