烂设计——被复杂化的索引

来源：互联网发布：mac版本pr怎么降噪音编辑：程序博客网时间：2024/06/01 10:13
好的设计是：
先生产节点编号A_ind，在索引
       % upper half        for i=1:m/2-1            for j=1:n                M=m/2-1;                Begin=1; End= M*n;                id=Begin-1+(j-1)*M +i;                 if(id+1<=End)                    A(id, id+1)=-1;                end                if(id-1>=Begin)                    A(id, id-1)=-1;                end                if(id+m<=End)                    A(id, id+M)=-1;                end                if(id-m>=Begin)                    A(id, id-M)=-1;                end                A(id, id  )=4;                k=k+1;            end        end        for i=1:m/2-1   % -1            for j=1:n                M2=m/2-1;   % shift in id                Begin2=End; % line 28                End2= End+M2*n;                id=Begin2-1+(j-1)*M +i;                 if(id+1<=End2)                    A(id, id+1)=-1;                end                if(id-1>=Begin2)                    A(id, id-1)=-1;                end                if(id+M<=End2)                    A(id, id+M2)=-1;                end                if(id-M>=Begin2)                    A(id, id-M2)=-1;                end                A(id, id  )=4;                k=k+1;            end        end        % interface        % error        for i=m            for j=1:n                M=m/2;                id= (j-1)*M +i;                 if(1)%id+1<=mn/2)                    %A(id, id+1)=-1;                    index_j= id+ m*n/2- (i-1);                    A(id, index_j)=-1;                end                if(id-1>=1)                    A(id, id-1)=-1;                end                if(id+M<=mn/2)                    A(id, id+M)=-1;                end                if(id-M>=1)                    A(id, id-M)=-1;                end                A(id, id  )=4;                k=k+1;            end        end        %}