When compute the error and residual in Q1 efg, should use || ||_1 norm ( column norm) not || || infinity norm, right? Thanks.
Please stick to infinity norms as requested.
And for those 3 questions, the results should be exact or 3-decimal digitals?
For finding norms, condition numbers, residuals, etc,
don’t bother with 3-decimals. Just use regular calculations.
The 3 decimals are for (b) and (c).