Some Octave newbie questions regarding number format and matrices

[hdfrango]

Hi,

I started using Octave very recently and am still unsure about a few things:

1. is there any way to force octave to express numbers in fraction form, to
avoid loss of precision?

2. when I want to computer the inverse of a matrix, I have to do inv(A'),
computing the inverse of the transpose, in order to get the correct answer.
Why is that?

thank you
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