Write a function forwardSub.m which implements the forward substitution algorithm for solving an n x n lower-triangular system Ax = b

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Forward substitution algorithm My Solutions

Write a function forwardSub.m which implements the forward substitution algorithm for solving an n x n lower-triangular system Ax = b. where A is a non-singular

n x n lower-triangular matrix.

Inputs:

. A(nxnarray)

. b(nxlarray)

Outputs:

. an integer errmsg equal to 11f A is not lower-triangular, 2 if A is lower-triangular but not invertible, and O otherwise.

. an n x I array x equal to the solution to Ax = b if errmsg=ø. or equal to zeros(n,1) if the problem is not lower-triangular or invertible.

To test whether A is invertible, you can test that none of its diagonal elements is zero.

Attachments:

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