Surface under the curve

Question

Mahi Nazir 2015-3-23

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https://ww2.mathworks.cn/matlabcentral/answers/184583-surface-under-the-curve

评论： Star Strider 2015-3-24

SurfaceUnderTheCurve.png

I have 3 vectors x,y,z such that function plot3 plots the attached graph. I need to fit a surface such that I get somewhat second attached graph.

I have tried surf function but I don't get the results I want. Kindly help

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Answer 1

Star Strider 2015-3-23

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https://ww2.mathworks.cn/matlabcentral/answers/184583-surface-under-the-curve#answer_172394

在 MATLAB Online 中打开

This looks something like what you want:

x = [0:10 10];
y = [0:10 10];
z= [0 6 5 8 7 7 8 9 7 5 6 0];
figure(1)
patch(x, y, z, 'g')
grid on
view([-30  30])

The key is using the patch function.

producing:

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Mahi Nazir 2015-3-24

Thanks star. Thats what i wanted... cheers!

Star Strider 2015-3-24

My pleasure! Cheers!

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Answer 2

Konstantinos Sofos 2015-3-23

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https://ww2.mathworks.cn/matlabcentral/answers/184583-surface-under-the-curve#answer_172375

griddata is the key function

Does this helps How to plot a 2d matrix on a 3d graph?

Regards

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Mahi Nazir 2015-3-23

在 MATLAB Online 中打开

Hi Thanks for your reply.

For example I choose

 x=1:10
 y=1:10
 z= [6 5 8 7 7 8 9 7 5 6]

I cant see this working here. Can you please help.

Konstantinos Sofos 2015-3-23

编辑：Konstantinos Sofos 2015-3-23

Hi,

Your x,y are identical, so your data are collinear. It doesn't make sense and this is not a 3D problem but a 2D

"In statistics, multicollinearity (also collinearity) is a phenomenon in which two or more predictor variables in a multiple regression model are highly correlated, meaning that one can be linearly predicted from the others with a non-trivial degree of accuracy."

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