Displaying 2 results from an estimated 2 matches for "wythal".
Did you mean:
wythall
2002 Jan 21
1
[R-1.4.0] minimum spanning tree of large ontology
Dear all,
I have an ontology which I would like to load in R to then compute the
minimum distance between elements.
Since this ontology is not only DAG, the problem is non trivial and
therefore decided to use R with the powerful e1071
library (allShortestPaths) to do that. That method requires to provide a
distance matrix between the
various objects. My ontology contains 32768 objects and
2002 Jan 16
2
Subsetting data frames without a loop
I KNOW this should be easy, but I'm stuck.
My data frame consists of multiple observations from each of a number of
stations, and what I would like to do is create another data frame that
contains all the variables of the first, but only rows where a certain
variable is at its maximum for the station.
So, for example:
> my.df
stn obs v
1 1 1 0.26400396
2 2 1