How to plot a contour plot with the next data

Question

Sebastian 2014-3-2

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https://ww2.mathworks.cn/matlabcentral/answers/119763-how-to-plot-a-contour-plot-with-the-next-data

评论： Sebastian 2014-3-2

采纳的回答： Mischa Kim

Hello everyone! I have been trying to plot some data within an equation, but I have not been able to figure it out.

In my X-axis I should have a linspace(0.28,0.4,9)

In my Y-values I should have linspace(1200,1400,9)

My Z values are this equation:

Z=2077+79.5A-76.3B

Where A=[-1 1 -1 -1 1 -1 1 1 0]

& B=[1 -1 1 -1 1 -1 -1 1 0]

Can someone help me with this? From what I have read I know that it should use meshgrids and it should be very simple but I am not very familiarized with the topic. Thank you!

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Answer 1

Mischa Kim 2014-3-2

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https://ww2.mathworks.cn/matlabcentral/answers/119763-how-to-plot-a-contour-plot-with-the-next-data#answer_126748

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Hello Sebastian, I assume A is the x-parameter, B is the y-parameter?

 x = linspace(0.28,0.40,9);
 y = linspace(1200,1400,9);
 A = [-1 1 -1 -1 1 -1 1 1 0];
 B = [1 -1 1 -1 1 -1 -1 1 0];
 [X,Y] = meshgrid(A, B);
 Z = 2077 + 79.5*X - 76.3*Y;
 figure
 contour(Z)
 set(gca,'XTickLabel',num2str(x'))
 set(gca,'YTickLabel',num2str(y'))

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Sebastian 2014-3-2

I tried the same before, but the problem is that I need to have some diagonals lines in the image instead of what we are getting. I will attach the image for better understanding. Thank you Mischa!

I should get this image where the x-axis is the linspace(0.28,0.4,9) & the y-axis is linspace(1200,1400,9).

Sebastian 2014-3-2