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Saving data loses information?

From: Jose
Subject: Saving data loses information?
Date: Sat, 2 Nov 2013 01:49:43 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0


I have a particular case of a covariance matrix with a large condition number, whose inverse is problematic
debug> eig(cholinv(cov_b));
error: eig: EIG: matrix contains Inf or NaN values
debug> any(any(isnan(cov_b)||isinf(cov_b)))
ans = 0
debug> cond(cov_b)
ans =  1.0901e+06
I saved the matrix in a file using the binary option, and to my surprise, when loaded into another freshly opened octave session, I can execute eig(cholinv(cov_b)) with no problems.

Could it be the cause of this is that the saving and loading of the data is not 100% accurate? Is there any other possibility?

If so, is there any format that is guaranteed to be 100% accurate?


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