Plotting in 3D

Question

kasim 2020-4-12

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关闭： MATLAB Answer Bot 2021-8-20

Hi, I am trying to plot 3 variables in the x,y,z plane in MATLAB.However, I keep getting an error.

I have 3 sets of data,

h = [0.015 0.02 0.025 0.03 0.035 0.04];

Tout = [311.32 317.72 323.94 329.54 334.35 338.42];

Area = [0.72 1.28 2 2.88 3.92 5.12];

How can I get a mesh that shows h on the x axis, Tout on the y axis & Area on the z axis?

Regards

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Cris LaPierre 2020-4-12

There is not enough data. To plot in 3D, you need to know the area for every combination of h and Tout. Therefore, Area needs to be a matrix where the rows correspond to the values of Tout, and the columns correspond to the values of h.

For example, I can see that when h=0.015 and Tout=311.32, Area=0.72. But what is the Area when h=0.015 and Tout=338.42?

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Answer 1

Star Strider 2020-4-12

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With your data, this is likely the best you dan do:

h = [0.015  0.02    0.025   0.03    0.035   0.04];
Tout = [311.32 317.72  323.94  329.54  334.35  338.42];
Area = [0.72    1.28    2   2.88    3.92    5.12];
hv = linspace(min(h), max(h), 6);
Toutv = linspace(min(Tout), max(Tout), 8);
[H,T] = ndgrid(hv,Toutv);
A = griddata(h,Tout,Area, H,T, 'nearest');
figure
mesh(H, T, A)
grid on

The vector sizes for ‘hv’ and ‘Toutv’ are arbitrary, so make them whatever lengths you want The 'nearest' method is the only one that will work with your data.

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