How to plot 3-D grid data in scatter plot?

Question

Ferry Nieuwland 2020-10-13

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编辑： Jorg Herwanger 2022-1-14

Hello Community,

I have 2 datasets from a 3-D simulation model. I can easily read these datasets into Matlab and see the data. I now want to plot these 2 datasets on a scatter plot. I am struggling to get this data plotted.

I load the grid with:

>> A=load('PERM2.mat')

A =

struct with fields:

Node: [1×1 struct]

Same for 2nd dataset.

When I do:

>> plot(A.Node.Value,B.Node.Value)

Error using plot

Data cannot have more than 2 dimensions.

And this is where I am stuck. Any suggestion what I am doing wrong or what I need to do to plot these 2 datasets? I have attached the 2 datasets.

Thanks,

Ferry

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Jorg Herwanger 2021-8-17

编辑：Jorg Herwanger 2022-1-14

You can reshape both 3-D arrays into vectors of length nx*ny*nz.

PERM = load('PERM2.mat')

PERM_Vector = reshape(PERM.Node.Value,[51*107*57,1,1])

PHIE = load('PHIE.mat')

PHIE_Vector = reshape(PHIE.Node.Value,[51*107*57,1,1])

plot(PHIE_Vector,PERM_Vector)

In the example, I get the dimensions of the 3D array (51 x 107 x 57) using size(PERM.Node.Value).

I think I know what you want to do: you can now establish a relationship between PHIE and PERM from the crossplot.

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Answer 1

KSSV 2020-10-13

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编辑：KSSV 2020-10-13

在 MATLAB Online 中打开

I think your mat files has 3D matrices. You need to use cpcolor or surf to plot them.

load PERM2.mat ;
A = Node.Value ;
[m,n,p] = size(A) ;
for i = 1:p
    pcolor(A(:,:,i))
    shading interp 
    colorbar
    drawnow
end

If you have x, y you can provide them in pcolor.

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Ferry Nieuwland 2020-10-13

Hello,

You are correct: the mat files have data for 3D matrices.

I wouild like to create a crossplot of these 2 3D matrices, with A on the X-axis and B on the Y-axis. That is where I am struggling; how to create this cross plot. The plot function does not allow 3D matrices to be plotted in a scatter plot.

Any suggestions?

Thanks,

Ferry

KSSV 2020-10-13

What do you mean by cross plot? Won't surf/ pcolor work for you?

In case are you looking to plot a slice..have a look on slice function.

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Answer 2

Ferry Nieuwland 2020-10-13

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Hello,

The A matrix is made up of 51 x 107 x 51 datapoints. The B matrix has same size, 51 x 107 x 51 datapoints. Point A(1,1,1) correlates to point B(1,1,1) , etc.

I want to create a plot where all A points are plotted on X-axis and all corresponding B values on the Y-axis. That is what I am trying to do: to investigate the correlation between these datasets. The slice and surf function did not help here.

Any suggestion how to do this?

Thanks,

Ferry