import data and plat a 3D

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Verena Salan
Verena Salan 2019-12-20
评论： Rik 2020-1-6
I do have a excel file with 3 columns (x y z). I wanna import them to Matlab, and plot a nice surface Plot.i might have to interpolate?
  2 个评论
Rik
Rik 2019-12-20
If it is a full grid of x and y, there will be no need for interpollation. Can you share your actual data, or a functional equivalent?

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回答（2 个）

Rik
Rik 2019-12-20
No interpollation required, just a conversion to a 2D matrix. You can adapt the syntax of accumarray if you do have any missing values (by default it will fill with 0).
num=xlsread('test1.xlsx');
x=num(:,1);
y=num(:,2);
P=num(:,3);
%find the unique x and y values and use them as indices to fill the Z
[X,~,x_]=unique(x);
[Y,~,y_]=unique(y);
Z=accumarray([x_,y_],P);
[X,Y]=ndgrid(X,Y);
surf(X,Y,Z)
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Rik
Rik 2020-1-6
On a conceptual level, what would you do? If you needed to do it on paper, what would your approach be?

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ME
ME 2019-12-20
I think you are correct about the need to interpolate. You could try having a read of the link below - that should give you some good pointers.
https://uk.mathworks.com/help/matlab/math/interpolating-scattered-data.html

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