[R] Extract values from multiple lists

[SH]

Dear List,

I hope this posting is not redundant.  I have several list outputs with the
same components.  I ran a function with three different scenarios below
(e.g., scen1, scen2, and scen3,...,scenN).  I would like to extract the
same components and group them as a data frame.  For example,
pop.inf.r1 <- scen1[['pop.inf.r']]
pop.inf.r2 <- scen2[['pop.inf.r']]
pop.inf.r3 <- scen3[['pop.inf.r']]
...
pop.inf.rN<-scenN[['pop.inf.r']]
new.df <- data.frame(pop.inf.r1, pop.inf.r2, pop.inf.r3,...,pop.inf.rN)

My final output would be 'new.df'.  Could you help me how I can do that
efficiently?

Thanks in advance,

Steve

P.S.:  Below are some examples of summary outputs.


> summary(scen1)
                Length Class  Mode
aql                1   -none- numeric
rql                1   -none- numeric
alpha              1   -none- numeric
beta               1   -none- numeric
n.sim              1   -none- numeric
N                  1   -none- numeric
n.sample           1   -none- numeric
n.acc              1   -none- numeric
lot.inf.r          1   -none- numeric
pop.inf.n       2000   -none- list
pop.inf.r       2000   -none- list
pop.decision.t1 2000   -none- list
pop.decision.t2 2000   -none- list
sp.inf.n        2000   -none- list
sp.inf.r        2000   -none- list
sp.decision     2000   -none- list
> summary(scen2)
                Length Class  Mode
aql                1   -none- numeric
rql                1   -none- numeric
alpha              1   -none- numeric
beta               1   -none- numeric
n.sim              1   -none- numeric
N                  1   -none- numeric
n.sample           1   -none- numeric
n.acc              1   -none- numeric
lot.inf.r          1   -none- numeric
pop.inf.n       2000   -none- list
pop.inf.r       2000   -none- list
pop.decision.t1 2000   -none- list
pop.decision.t2 2000   -none- list
sp.inf.n        2000   -none- list
sp.inf.r        2000   -none- list
sp.decision     2000   -none- list
> summary(scen3)
                Length Class  Mode
aql                1   -none- numeric
rql                1   -none- numeric
alpha              1   -none- numeric
beta               1   -none- numeric
n.sim              1   -none- numeric
N                  1   -none- numeric
n.sample           1   -none- numeric
n.acc              1   -none- numeric
lot.inf.r          1   -none- numeric
pop.inf.n       2000   -none- list
pop.inf.r       2000   -none- list
pop.decision.t1 2000   -none- list
pop.decision.t2 2000   -none- list
sp.inf.n        2000   -none- list
sp.inf.r        2000   -none- list
sp.decision     2000   -none- list

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