i have a matrix A=zeros(400,400).
A(1:m+1:end) = 1 % main diagonal
A(21:m+1:end) = -.25 % lower diagonal
A(8001:m+1:end) = -.25 %upper diag
A(2:m+1:end) = -.25 %close lower diag
A(401:m+1:end) = -.25 %close upper diag
The first three diagonals are continous and dont skip. However, i need the close lower and upper diagonals to be -.25 for every 2 instances. As in, the 3rd column of both close diagonals will be 0 and then the next two are -.25 followed by another 0 for the entire 400x400 matrix. NOTE: the close upper diagonal starts in column 2 while the lower starts in the first diagonal. EX. i need A(3,4)=0 ...A(6,7)=0... etc i am aware of the pattern i just dont know how solve in matlab