Save generated points in txt file

Hi,

I try to generate surface points and store them into txt file for further processing.

The points should be used to generate a surface in Ansys Design modeler.

Therefore the format should be in txt file like:

x1 y1 z1

x2 y2 z2

... ... ...

xn yn zn

but my code gives

x1 x2 x3 y1 y2 y3 z1 z2 z3

N = [3 3]; % size in pixels of image
 F = 3;        % frequency-filter width

 [X,Y] = ndgrid(1:N(1),1:N(2));
 i = min(X-1,N(1)-X+1);
 j = min(Y-1,N(2)-Y+1);
 H = exp(-.5*(i.^2+j.^2)/F^2);
 Z = real(ifft2(H.*fft2(randn(N))));

 surf(X,Y,Z,'edgecolor','none');
 light;
 
 X
 T=table(X,Y,Z,'VariableNames',{'X','Y','Z'})
 writetable(T,'MyFile.txt')

I don't know how to aligne the coordinates in a right way.

Best regards

Steff

Answer 1

[dpb]

ndgrid generates X,Y as arrays; in your case 3x3. For output you need to convert to vectors before making the table...

T=table(X(:),Y(:),Z(:),'VariableNames',{'X','Y','Z'});

If the only point is to get the output file, you could dispense with creating the table:

writematrix([X(:),Y(:),Z(:)],'T.txt')