How to transform a XYZ-Array into a XxY-Matrix with Z as values of each Mxy-Component and vice versa?

Question

Emerson De Souza 2012-11-18

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评论： Ander Del Olmo Sanz 2023-1-25

Hi, I have a table XYZ with three columns (xyz) as below:

and I want to transform it into a Mxy-Matrix with Z as value for each Mxy pair as follows:

4  7
5  8
6  9

On the other hand I may have directly the Matrix Mxy and would like to obtain the XYZ-table.

I already tried mesh, meshgrid, ndgrid, surf and etc... as documented, but nothing worked as I wished. It is possible that I did not understand yet how to use this commands.

I wonder if someone could tell me how to write the command to convert:

1) Table XYZ to Matrix Mxy with Z as values of each Mxy-pair 2) Matrix Mxy to Table XYZ

I thank you in advance for your help

Emerson

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Answer 1

Walter Roberson 2012-11-18

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https://ww2.mathworks.cn/matlabcentral/answers/54029-how-to-transform-a-xyz-array-into-a-xxy-matrix-with-z-as-values-of-each-mxy-component-and-vice-versa#answer_65691

在 MATLAB Online 中打开

accumarray(XYZ(:,[2 1]), XYZ(:,3)]

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Emerson De Souza 2012-11-19

Thank you Walter, your suggestions fixed my problem. Wish you a nice day

Emerson

Ander Del Olmo Sanz 2023-1-25

I have the same problem, but in my case values are not whole number, since it is the measurement of a 3D part, but i want just to sabe the values of Z axis, so what can I do for rationa number with commas, like 5,5 or 7.8 in X and Y axis ?

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