Extracts pairs from a path of indices, representing the path by the pairs (connected by common variable) and return a shortened path.
extract_pairs(x, n)the path, a vector or
list of indices of the variables to be plotted.
A vector of length two giving the number
of pairs to extract from the path x (if NULL, all pairs are
returned (nothing extracted); if of length one, it is replicated in the pair).
The first number corresponds to the beginning of the path,
the second to the end; at least one of the two numbers should be >= 1.
returns an object of the same type as the input
x but (possibly) shortened. It extracts the first/last so-many
pairs of x.
zenplot() which provides the zenplot.
Other tools related to constructing zenpaths:
connect_pairs(),
graph_pairs(),
groupData(),
indexData(),
zenpath()
## Begin with a path
(zp <- zenpath(c(3, 5), method = "eulerian.cross")) # integer(2) argument
#> [1] 1 4 2 5 1 6 2 7 1 8 3 4 3 6 7 3 5 8 2
## Extract the first two pairs and last four of indices
extract_pairs(zp, n = c(2, 4))
#> [1] 1 4 2 7 3 5 8 2
## Extract the first and last three pairs of indices
extract_pairs(zp, n = 3) # the 3 is repeated automatically
#> [1] 1 4 2 5 3 5 8 2