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Numerical Constraints
Numerical methods also have problems when:
- Equations are degenerate "within round-off error".
- Accumulated round-off errors swamp solution (magnitude of a's and x's varies wildly).
For n,m < 50, single precision usually OK.
For n,m < 200, double precision usually OK.
For 200 < n,m < few thousand, solutions possible only for sparse systems (lots of a's zero).
Notes: