Displaying 2 results from an estimated 2 matches for "dannemora".
2010 Apr 06
2
Extracting formulae from expression() / deriv()
I am attempting to extract the derivative/ gradient from this expression
df1p <- deriv(f1, "P")
> df1p
expression({
.value <- s - c - a * P
.grad <- array(0, c(length(.value), 1L), list(NULL, c("P")))
.grad[, "P"] <- -a
attr(.value, "gradient") <- .grad
.value
})
So in this case I want to extract the "-a".
2010 Aug 25
4
Merging two data set in R,
Dear R Gurus,
I am currently working on the two dataset ( A and B), they both have the
same fields: ID , REGION, OFFICE, CSTART, CEND, NCYCLE, STATUS and
CB.
I want to merge the two data set by ID. The problem I have is that the
in data A, the ID's are unique. However in the data set B, the ID's are
not unique, thus some repeat themselves.
How do I the merge or retrieve the