how to use kron command to form a 2D matrix when 1D is known

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Jiali 2021-6-15

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关闭： Jiali 2021-7-15

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Dear community,

I would like to use Kron command to form a 2D stencil grid when 1D matrix of row or column is known. For example, the below code is shown:

Nx=10;
Ny=8;
% every row or column in 1D should be in the below format
A=[-1*ones(Nx,1), ones(Nx,1)];
DeX=spdiags(A,[0 1],Nx,Nx);
DeX(Nx,Nx-1)=1;
B=[-1*ones(Ny,1),ones(Ny,1)];
DeY=spdiags(B,[0 1],Ny,Ny);
DeY(Ny,Ny-1)=1;
DeX_2D=kron(eye(Ny),DeX);
DeY_2D=kron(DeY,eye(Nx));