[R] Matrix from List
Nelson Villoria
nvilloria at gmail.com
Fri Jul 25 23:32:23 CEST 2008
Hello, I have a list in which each element is a list. I want to
create a matrix indexed by the two indices of the list. I have been
using do.call, but I am not getting what I want. Let me show you:
> l.intercepts #the list that nests another list
$`1995`
$`1995`$`31`
(Intercept)
25.37164
$`1995`$`33`
(Intercept)
26.66755
$`2006`
$`2006`$`31`
(Intercept)
25.86621
$`2006`$`33`
(Intercept)
26.44245
I want a matrix like
1995 31 25.37164
1995 33 26.66755
2006 31 25.86621
2006 33 26.44245
I notice that if I do:
> l.intercepts_1 <- lapply(l.intercepts, function(x) do.call(rbind, x))
I get:
> l.intercepts_1
$`1995`
(Intercept)
31 25.37164
33 26.66755
$`2006`
(Intercept)
31 25.86621
33 26.44245
However,If I further write:
> do.call("rbind", l.intercepts_1)
I get:
(Intercept)
31 25.37164
33 26.66755
31 25.86621
33 26.44245
Why do.call did not index by year (i.e. 1995 and 2006) as it did
before for 31 and 33? Any suggestion about how to accomplish this
task? Help is greatly appreciated.
Nelson Villoria
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