If you multiply a matrix by its inverse you should get an identity matrix. In R, you get an answer that is accurate up to about 16 decimal points? Why can't one get a perfect answer?
Because R makes use of a digital computer which cannot work exactly using floating-point arithmetics ...
Please read some textbook about a numerics and computers.
Uwe Ligges
See for example:
c(5,3)->x1 c(3,2)->x2 cbind(x1,x2)->x solve(x)->y x%*%y
Vikas Rawal
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