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I make some changes: % split the solution vector pas=size(A11); v1=v(1:pas); v2=v(pas(1)+1:2*pas(1)); v3=v(2*pas(1)+1:3*pas(1)); v4=v(3*pas(1)+1:4*pas(1)); % boundary conditions for i=1:pas vv1(i,1)=1; vv2(i,1)=0; vv3(i,1)=0; vv4(i,1)=0; end vv1(:,2)=v1; vv2(:,2)=v2; vv3(:,2)=v3...

Hi Greg, Thanks for your reply. I think my issues start when I try to split the big vector v, into 4 small vectors (one for each equation:v1,v2,v3,v4). After that, the boundary conditions(vv1,vv2,vv3,vv4) is not correctly implemented (it's need to be created dynamically). In conclusion, there...

I want to solve the reaction-diffusion problem, in 2D, with Matlab: Sum_{j=1}^{4} D_{1j} * (drond^{2}z_{j} / drond x^{2} + drond^{2}z_{j} / drond y^{2}) + R_{1} = 0 Sum_{j=1}^{4} D_{2j} * (drond^{2}z_{j} / drond x^{2} + drond^{2}z_{j} / drond y^{2}) + R_{2} = 0 Sum_{j=1}^{4} D_{3j} *...