Hi ,
As per my understanding, the code has the following errors:
- The function "generateMesh(model)" was called but the output "U" is not used to access nodes and elements of the generated mesh.
- The variable "pl2 = pdeplot3D(model)" assigns the plot to a variable, but "pdeplot3D" does not return the data in the way you are trying to access. This function is used for plotting and not for extracting X, Y, and Z data directly. You can extract the mesh node coordinates from the generated mesh model.
- The "griddata" function call "Xgrid = griddata(y,z,x,Y,Z,);" is incorrect as the variables "x", "y" and "z" are not defined.
Please refer to the modified code below for better understanding of the above mentioned points:
model = createpde;
mesh = generateMesh(model); % Generate mesh for the geometry
% Extract mesh node coordinates
X = model.Mesh.Nodes(1, :); % X coordinates
Y = model.Mesh.Nodes(2, :); % Y coordinates
Z = model.Mesh.Nodes(3, :); % Z coordinates
% Use griddata
Xgrid = griddata(Y, Z, X, Y, Z); % Interpolating the X values
% Define bounds for where you want to subtract
x_min = -10; x_max = 10;
y_min = -5; y_max = 5;
z_min = 0; z_max = 15;
% Create a mask for the red section
mask = (X > x_min) & (X < x_max) & (Y > y_min) & (Y < y_max) & (Z > z_min) & (Z < z_max);
% Apply the subtraction only in the selected region
X_subtracted = X;
X_subtracted(mask) = X(mask) - Xgrid(mask);
% Plot the result
figure;
plot3(X_subtracted, Y, Z);
I hope this resolves your query!
