I have 4D array E1 = E(13,1,8:20,1:800), and would like to convert it into a 2D array. The E1 displays the output as: val(:, :, 1, 1) = …. val(:, :, 2, 1) =….. …………………. …………………. val(:, :, 13, 800)=….. Now, I would like to generate a 2D output with 1:800 in rows and 8:20 in columns.
MATLAB: Conversion of 4D array to a 2D array
4d array into a 2d array
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The rows and columns are not multiplied. "256 * 208 * 2" means, that the array has the dimensions [256, 208, 2]. The trailing 2 could mean, that each pixel of a 2D plane has 2 color components, e.g. hue and saturation or red and blue. Or the first component can be the Z-value, while the second one is the grey level.
There is no standard definition for 4D images (as there is no for 3D images). It could be a movie, when the 4th component is the time and the first 3 components are RGB images.
Is it clearer now? The numbers are not factors, but the dimension of a kind of table.
Still not 100% sure what you are looking for, but you said you want to display your scattered points as a solid, so that leads me to believe this would be a step in the right direction.
%%Your points
x=Node_X;y=Node_Y;z=Node_Z;%%3d grid
[X,Y,Z]=meshgrid(min(x):1:max(x),min(y):1:max(y),min(z):1:max(z));%%3d boundary
tri = delaunayn([x y z]);%%find points inside of 3d boundary
tn = tsearchn([x y z], tri, [X(:) Y(:) Z(:)]); IsInside = ~isnan(tn) %%build volumetric image
I=logical(zeros(size(X)));I(IsInside)=true;You can change the image resolution by adjusting the number of points in your grid. Even with a step-size of one unit, the code runs very slow.
Here's a faster way to look at your data as a shell
k=boundary([x,y,z])trisurf(k,x,y,z)The left figure displays a shell and the right figure displays a slice of the stacked image I.
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