[R] creating a matrix subset based on a threshold cutoff

[rich at thevillas.eclipse.co.uk]

   Hi,

    I have a table of x rows and y columns. The table is huge and so i'd like
   to create a subset of the data containing rows where any of the y values are
   below a threshold, say 1e-4. Is there a simple way of doing this in R?


   thanks

   Rich