Displaying 2 results from an estimated 2 matches for "200000x2".
Did you mean:
20000002
2012 Jun 28
2
Aggregate weights for a unique set of rows
...nique set of nodes (X/Y-coordinates):
nodes <- matrix(c(1,2,3,4,5,6,1,2,1,4),ncol=2, byrow=T)
desired Result:
#nodes
[,1] [,2]
[1,] 1 2
[2,] 3 4
[3,] 5 6
[4,] 1 4
#weights
2 1 1 1
That is my solution, but it is very slow (typical size of nodes -->
200000x2):
weights <- c(1, 1, 1, 1, 1)
nodes <- matrix(c(1,2,3,4,5,6,1,2,1,4),ncol=2, byrow=T)
## to be replaced by a faster code
drop.index <- duplicated(nodes)
n.unique <- nodes[!drop.index, ]
w.unique <- numeric(length(n.unique[,1]))
lw <- length(weights)
for (i in seq_along(w....
2003 Mar 20
2
Matrix problems
Hi all.
I do not know if it is a bug in the windows version but i have this
problem.
Reading a file with 200000 rows, 2 columns and transforming into a
200000 x 2 matrix.
If I try to find an element by using the which command which gives
some correct indexes plus some others passing the 200000 row
boundaries.
If I try to reach those "outbound" indexs I get an "Error: subscript out