Hi David,
Thanks for clarifying and the hints. Now that I know, I have already
rewritten it differently and that works. At its core it was quite simply:
> foo <- fromJSON(json_str='{"query":{"A":10, "B":null, "C":"hello"},
"query":{"A":20, "B":null, "C":"hello again"}}')
> as.matrix(t(sapply(foo, function(s) s)))
A B C
query 10 NULL "hello"
query 20 NULL "hello again"
Regards
Dinesh
On 6/19/2012 8:50 PM, David Winsemius wrote:
On Jun 19, 2012, at 6:57 AM, dinesh wrote:
Hi,
I have a very rudimentary kind of question on using unlist(). I am
parsing a bunch of JSON text using rjson package. Some data elements
in a dictionary happen to be null which rjson parses correctly.
> fromJSON(json_str='{"query":{"A":10, "B":null, "C":"hello"},
"query":{"A":20, "B":null, "C":"hello again"}}')
NULL items are not allowed in atomic vectors and matrices are just
folded vectors. I'm not sure I see a way to turn this into a
dimensioned structure. Conversion of the NULL element to NA might
make more sense.
> c(1,2,NULL,5)
[1] 1 2 5
X <-list("a", NULL, "b")
> unlist(X)
[1] "a" "b"
X[unlist(lapply(X , is.null))] <- NA
> unlist(X)
[1] "a" NA "b"
Trying to replicate list structures from console output is tedious.
Perhaps if you first explain the gals of the effort and then post
dput() applied to this object it might get more prompt attention than
this posting did.
--
Regards,
Dinesh
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