[R] princomp scores reproduced

[array chip]

Hi,

I used "princomp" for PCA analysis based on
correlation matrix (cor=T). I would like to reproduce
the scores for each observation by first standardizing
the data matrix (mean=0, std err=1), and then
multiplied by the loadings of each variable for each
principle components. I get very close numbers, but
not exactly the same. anything I missed here?

tahnks