Vikas Rawal wrote:
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
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?
See for example:
c(5,3)-x1
c(3,2)-x2
cbind(x1,x2)-x
solve(x)-y
x%*%y
Vikas Rawal
