How to print a 3D matrix to a text file?

Question

Jamie Al 2022-10-8

0
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https://ww2.mathworks.cn/matlabcentral/answers/1820255-how-to-print-a-3d-matrix-to-a-text-file

评论： Jamie Al 2022-10-20

How can I save the following 3D matrix in a text file using MATLAB?

Nx = 4;
Ny = 4;  
Nz = 4;
x   = (0:Nx-1)/Nx*2*pi;         
y   = (0:Ny-1)/Ny*2*pi;
z   = (0:Nz-1)/Nz*2*pi;
[X,Y,Z] = meshgrid(x,y,z);
%how to save X, Y, and Z in text files?

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Dyuman Joshi 2022-10-9

在 MATLAB Online 中打开

You can directly write a matrix into a text file using writematrix()

Nx = 4;
Ny = 4;  
Nz = 4;
x   = (0:Nx-1)/Nx*2*pi;         
y   = (0:Ny-1)/Ny*2*pi;
z   = (0:Nz-1)/Nz*2*pi;
[X,Y,Z] = meshgrid(x,y,z);
%how to save X, Y, and Z in text files?
X
X = 
X(:,:,1) =

         0    1.5708    3.1416    4.7124
         0    1.5708    3.1416    4.7124
         0    1.5708    3.1416    4.7124
         0    1.5708    3.1416    4.7124


X(:,:,2) =

         0    1.5708    3.1416    4.7124
         0    1.5708    3.1416    4.7124
         0    1.5708    3.1416    4.7124
         0    1.5708    3.1416    4.7124


X(:,:,3) =

         0    1.5708    3.1416    4.7124
         0    1.5708    3.1416    4.7124
         0    1.5708    3.1416    4.7124
         0    1.5708    3.1416    4.7124


X(:,:,4) =

         0    1.5708    3.1416    4.7124
         0    1.5708    3.1416    4.7124
         0    1.5708    3.1416    4.7124
         0    1.5708    3.1416    4.7124
%writing in a text file
writematrix(X,'X.txt')
%showing the output
type 'X.txt'
0,1.5707963267949,3.14159265358979,4.71238898038469,0,1.5707963267949,3.14159265358979,4.71238898038469,0,1.5707963267949,3.14159265358979,4.71238898038469,0,1.5707963267949,3.14159265358979,4.71238898038469
0,1.5707963267949,3.14159265358979,4.71238898038469,0,1.5707963267949,3.14159265358979,4.71238898038469,0,1.5707963267949,3.14159265358979,4.71238898038469,0,1.5707963267949,3.14159265358979,4.71238898038469
0,1.5707963267949,3.14159265358979,4.71238898038469,0,1.5707963267949,3.14159265358979,4.71238898038469,0,1.5707963267949,3.14159265358979,4.71238898038469,0,1.5707963267949,3.14159265358979,4.71238898038469
0,1.5707963267949,3.14159265358979,4.71238898038469,0,1.5707963267949,3.14159265358979,4.71238898038469,0,1.5707963267949,3.14159265358979,4.71238898038469,0,1.5707963267949,3.14159265358979,4.71238898038469

However, is this the way you want to store the matrix?

If not, please give an example of how you would want to store a matrix

Jamie Al 2022-10-11

Thanks!

Jamie Al 2022-10-20

Just noticed this prints a text file that is readable as 16X256 instead of 16x16x16 and I wonder if it has to do with the readmatrix function or the way it's written into a text file. Thanks again.

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