[R] how to pick a value from AR equation

[Lorenzo Bencivelli]

i need to compute several (hundreds) of regression AR and PP.test for 
untary roots.
is there an easy way to pick the values of interest from the output of 
these operations?
i would like to fill a matrix (in a for cycle) with all the values of 
coefficients, standard deviations, PP statistics and the relevant 
critical value for the series i have.
thanks in advance L

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e nella liberta' e nella giustizia che dalla ragione scaturiscono. (sciascia)