# Jacobi method in matlab

6 views (last 30 days)
steve Brian on 9 Apr 2020
Edited: steve Brian on 9 Apr 2020
Hi there, I'm at the beginning and I don't know how to work with matrices.
I have a function that receives as a parameter, a matrix in the form of CSR, an iteration vector and a tolerance
My function is of form: function [x] = jacobi_sparse (values, colomn, rowptr, c, tol) %1
I create a function which multiplies a matrix A in the form csr (A) with a vector(x), like this: (y = Ax)
function [y] = csr_multiplication(values, colind, rowptr, x) %2
n = length(x);
y = zeros(n, 1);
for i = 1:n
for j = rowptr(i):rowptr(i+1) - 1
y(i) = y(i) + values(j) * x(colind(j));
end
end
endfunction
The function I want to implement %1, i want to use my %2 to return value of x.
tol - is the tolerance under which iterations stop.
The initial vector with which the solution is approximated is 0
It is something like the Jacobian method, and function %1 need to return x, base on function %2.

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