R help - May 2013 - Estimating confidence intervals from several simulations

Hi,

I have 1000 simulations each arranged beneath another. The attached data is on
monthly basis. First column is number of simulation, second is year and the
rest, months.

Problem:?
1) Take sim 1 for example to be my original data from 1961-2005 with twelve
months. You can delete the years. I want to obtain results with same dimensions
as sim one but estimating the values in each row from the 1000 simulations as is
the case with bootstrapping. Instead of bootstrapping, I have simulations from
my model.
For example, after every 45th row, estimate values of row 1 and so on for other
rows.

2) estimate confidence intervals for the resulting 45 rows by 12 columns matrix.
Each value in each month and year should have a confidence interval. ?OR you
could estimate confidence intervals for each value in the data attached and then
do task 1.

3) Put the confidence intervals in 45 by 12 matrix, one matrix for lower CIs and
another 45 by 12 matrix for upper CIs.

Thanks so much for your great help.
Atem.