[R] How to partition sample space

[spime]

Hi R-users,

I need your help in the following problem. Suppose we have a regression
problem containing 25 predictor variables of 1000 individuals. I want to
divide the data matrix ( 1000 x 25 ) into two partitions for training (70%)
and testing(30%). For this reason, i sample 70% of data into another
training matrix and remaining 30% into testing matrix using pseudorandom
numbers (for future analysis).

I need some efficient solution so that we can generate both matrix with
minimal time. 

Thanks in advance.

Sabyasachi
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