Random perturbed uniform mesh in Matlab.... 1

[TLamb]

Hey guys and gals,
I am trying to generate a random perturbed mesh in Matlab and I an having a bit of problems. Does anyone know any good references that I can use to get an Algorithm or even some sample Matlab code.Or in general any suggestions at all will be welcomed.
Can't wait to see what you'll come up with..

Tony

 

[MikeyP]

Do you mean a simple rectangular grid whos nodes are shifted in some direction by small random amounts?

A little more information would be useful

M

--
Dr Michael F Platten

 

[TLamb]

yes Mickey..you hit the nail on the head.Each small quadrilateral therefore becomes distorted..
Tony

 

[MikeyP]

Try this

% define the undeformed mesh
x = [1:10];
y = [1:20];
[X,Y] = meshgrid(x,y);
% define some constant z values (for 3-D plotting)
Z = zeros(length(y),length(x));
% plot the undeformed mesh
figure;
subplot(1,2,1);
mesh(X,Y,Z);
axis([0 11 0 21 -1 1]);
view([0,0,1]);
title('Unperturbed Mesh');
% define the random perturbations
X_rand = (rand(length(y),length(x))-0.5)./3;
Y_rand = (rand(length(y),length(x))-0.5)./3;
% perturb the mesh
X_p = X+X_rand;
Y_p = Y+Y_rand;
% plot the deformed mesh
subplot(1,2,2);
mesh(X_p,Y_p,Z);
axis([0 11 0 21 -1 1]);
view([0,0,1]);
title('Perturbed Mesh');

M

--
Dr Michael F Platten

 

[TLamb]

I must say Mickey.....you are good at what you do ...

Thanks a million