[R] identical values not so identical? newbie help please!

[maiya]

Thanks Josh and Dan!

I did figure it had something to do with the machine epsilon...

But so what do I do now? I'm calculating the total absolute error over
thousands of tables e.g.:
tae<-sum(abs(obs-exp))
Is there any easy way to I keep these ignorable errors from showing up?

And furthermore, why does this happen only sometimes? The two (2D) tables I
attached are actually just one 'layer' in a 3D table. And only 2 out of
about 400 layers had this happen, all the other ones are identical -
perfectly! And out of 2000 3D tables, about 60 of which should have no
error, only 10 actually show an error of zero, and in the rest this same
thing happens in a few layers. 

OK, this is a bit messy for a real question. I mean I can just round down
all the errors that are under 1e-8 or something, but I'd much rather this
not happen in the first place?

Thanks again to the two posters for bothering with me!

Maja. 

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