Creating a Tridiagonal Matrix with varying values
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Jonathan Miles
le 2 Oct 2020
Réponse apportée : David Hill
le 2 Oct 2020
Hello, I am trying to create a tridiagonal matrix with varying values. As shown in the image below
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/369586/image.png)
the main diagonal is able to have varying value, but the code only works if the offsetting diagonals are constant values. I am attempting to have all 3 diagonals be varying numerals any help would be greatly appreciated. I will attach my code below.
function [A,b] = ok(k,m)
A=[k];
n=size(A,2)
b=[m];
if size(b,2) < 1
b=[m];
else
b=[m]';
j=size(b,2);
end
N = n;
a = -k;
d =4;
c =4;
M = zeros(N,N)
M( 1:1+N:N*N) = a
M(N+1:1+N:(N*N)-1) = d
M( 2:1+N:N*N-N) = c
As shown above a can =-k , but when I set d or c = to -k I will recieve an error.
Thank you.
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