My guess (unconfirmed) is that read.table() gives you a data frame but
density.lf expects an atomic (= not a list = not a data frame) vector.
Perhaps try density.lf(x[,1]) to just send the column -- the drop
behavior should make sure this is an atomic vector.
If that doesn't help, please do provide us with the output of
dput(head(x, 30))
and the package from which the density.lf function comes from.
Best,
Michael
On Thu, May 31, 2012 at 11:35 AM, Andrea S Sequeira
asequ...@wellesley.edu wrote:
Dear R help group: I am attempting to produce a density plot from a list of
2 values using the density.lf function and would appreciate any help, I
hope I have done my homework reading the documentation but I still seem to
be missing something basic.
I have read the data as a table using read.table, with header=TRUE (I
excluded 2000 values), when calling the objects it appears to be there and
I can see the values
this is what I get when doing
density.lf (x=logN0, n=50, window=gaussian)
Error in `[.data.frame`(x, order(x, na.last = na.last, decreasing =
decreasing)) :
undefined columns selected
then assigned a column name (using colname so it is called first), then
assigned it as a vector using
assign (x, c (logN0))
the error I get is
density.lf (x, n=50, window=gaussian)
Error in sort.int(x, na.last = na.last, decreasing = decreasing, ...) :
'x' must be atomic
the traceback produces:
traceback ()
5: stop('x' must be atomic)
4: sort.int(x, na.last = na.last, decreasing = decreasing, ...)
3: sort.default(x)
2: sort(x)
1: density.lf(x, n = 50, window = gaussian)
Thanks in advance, Andrea
--
Andrea Sequeira
Associate Professor
Department of Biological Sciences
Wellesley College, Wellesley MA 02481
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