Creating a Tridiagonal Matrix with varying values

Question

Jonathan Miles 2020-10-2

0
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https://ww2.mathworks.cn/matlabcentral/answers/603517-creating-a-tridiagonal-matrix-with-varying-values

回答： David Hill 2020-10-2

采纳的回答： David Hill

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Hello, I am trying to create a tridiagonal matrix with varying values. As shown in the image below

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