[R] machine precision problem

[wendy]

Dear all,

I am analysising a set of gene expression data using multiplicative Gaussian
Kernel function. I calculated the kernels between two gene sets with 20000
genes for each set. The kernels are less than 1, therefore the product of
the kernels is out of the minimum precision in R. I wonder if there is a way
to lowering the minimum double precision in R. I am using R version 2.10.1. 

Thank you in advance.
Wendy 
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