[R] Determinant
chasiotisv at math.auth.gr
chasiotisv at math.auth.gr
Thu May 14 10:44:10 CEST 2015
Hello,
I am Vasilis Chasiotis and I am a candidate Ph.D. student in Aristotle
University of Thessaloniki in Greece.
I have the following problem.
I want to check if the square of a number ( for example the square of
1.677722e+29 ) is an integer.
The problem is that this number is the calculation of the determinant
(so the number should be an integer) of a matrix 22x22, which means it
has an approximation ( the "real" number is 1.6777216e+29 but R gives
to me 1.6777215999999849e+29 ), because R use LU-decomposition to
calculate the determinant.
That means that the radical of the number 1.6777215999999849e+29 is
not an integer, but it should be.
How can we overcome this problem?
Thank you in advance.
I look forward to hearing from you soon.
Vasilis Chasiotis
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