Filter löschen
Filter löschen

How to generate Q4 element mesh in selected area?

2 Ansichten (letzte 30 Tage)
waqas
waqas am 8 Sep. 2021
Beantwortet: darova am 8 Sep. 2021
Hi,
I have a region ( variable 'nmask' in the .MAT file) on which I want to generate a Q4 mesh. In my current implementation, the nodes are not falling perfectly on the boundary of the region. Figure below should explain it further where red markers show the location of the nodes. Following code was used to generate these:
%load(data.mat)
tx = mfc:subset:mlc;
ty = mfr:subset:mlr;
[TX,TY] = meshgrid(tx,ty);
nodeDetails = [(1:size(TX,1)*size(TX,2))', TY(:),TX(:)];
%Connectivity Matrix
c = 0;
conect = zeros((size(TX,1)-1)*(size(TX,2)-1),4);
for j = 0:(size(TX,2)-2)
for i = 1: size(TX,1)-1
c = c + 1;
ii = j*(size(TX,1)) + i;
conect(c,:) = [ii, ii + 1, ii + size(TX,1) + 1, ii + size(TX,1)];
end
end
I am only interested in the white region. How can I also discard the other points?

Akzeptierte Antwort

darova
darova am 8 Sep. 2021
What about this?
x = [-10:-8 -7:7 8:10];
y = [-8:-6 -5:5 6:8];
[X,Y] = meshgrid(x,y);
i1 = -8<X & X<8 & -6<Y & Y<6; % inside region
i2 = X<0 & abs(Y)<2; % small hole right side
ind = i1 | i2;
Z = X*0;
Z(ind) = nan; % remove inside part
plot(X(:),Y(:),'.r') % whole mesh
surface(X,Y,Z)
view(45,45)

Weitere Antworten (0)

Kategorien

Mehr zu Creating and Concatenating Matrices finden Sie in Help Center und File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by