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Questions related to the calculation or use of the Jacobian matrix or its determinant. Not to be confused with the Jacobi iterative method for solving systems of linear equations. For those, use [iterative-method] instead.

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Implementation of the Jacobi iteration to find the solution to $Ax = b$

In your case (line 12 in your code) $$A = D-R.$$ Then $$ \begin{aligned} A\mathbf{x} {}&{}= D\mathbf{x}-R\mathbf{x}\\ {}&{}= \mathbf{b}\,, \end{aligned}$$ which rearranges to $$\mathbf{x} …
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