MATLAB Answers

# Solve ill-condition matrix

67 views (last 30 days)
jason law on 7 Jul 2020
Answered: M on 8 Jul 2020
How can I solve Ax=B matrix when the command window in matlab mentioned"matrix is badly scaled, singular Rcond 1e-16" something like this
I am using vpa(A), then inv(A) to solve the matrix, but the speed is a bit slow as I need to run for 1e4 times.
What is the difference between using these two methods pinv() and vpa(), inv()?
##### 0 CommentsShowHide -1 older comments

Sign in to comment.

### Answers (1)

M on 8 Jul 2020
Does it display this warning but still solve the equation ? How are the results ?
You can also try : x = A\B . It solves the system of linear equations A*x = B.
From Matlab doc : "If A is a square matrix, then A\B is roughly equal to inv(A)*B, but MATLAB processes A\B differently and more robustly."
##### 0 CommentsShowHide -1 older comments

Sign in to comment.

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!