How to build a 3D chart from a 2D table

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Hugo
Hugo on 9 Aug 2022
Edited: Cris LaPierre on 9 Aug 2022
Hi,
I have a 10*20 table, with each cell having a numeric value. I would like to build a 3D chart, having x as the dimension 10 of my table, x as the dimension 20 and z as the numeric value of each cell. How can I do it, assuming that I have the data in an excel file?
I thank you in advance,
Best regards,

Answers (1)

Cris LaPierre
Cris LaPierre on 9 Aug 2022
Edited: Cris LaPierre on 9 Aug 2022
What type of 3d chart do you want to create?
For a surface, you could use the following syntax (Z needs to be a matrix). Just note that the rows correspond to y and the columns to x, so you need to transpose the matrix to get what you want.
surf(Z) creates a surface plot and uses the column and row indices of the elements in Z as the x- and y-coordinates.
Z = rand(10,20);
surf(Z') %
xlabel('X')
ylabel('Y')
zlabel('Z')
This syntax is not universal across all 3D plotting functions. When it isn't, you can create X and Y vectors first.
x = 1:size(Z,1);
y = 1:size(Z,2);
[X,Y] = meshgrid(x,y);
scatter3(X,Y,Z')

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