R/Unary.R
aggregate_to_pref_suff_byname.Rd
Row and column names are often constructed in the form
prefix_start
prefix
prefix_end
suffix_start
suffix
suffix_end
and described by a notation vector.
(See notation_vec()
.)
This function performs aggregation by prefix or suffix according to a notation vector..
aggregate_to_pref_suff_byname( a, aggregation_map = NULL, keep, margin = c(1, 2), notation, pattern_type = "exact" )
a | a matrix of list of matrices to be aggregated by prefix or suffix |
---|---|
aggregation_map | See |
keep | |
margin | the dimension over which aggregation is to be performed; |
notation | See |
pattern_type | See |
an aggregated version of a
This function is a convenience function, as it bundles sequential calls to two helper functions,
rename_to_pref_suff_byname()
and aggregate_byname()
.
All arguments are passed to the helper functions.
m <- matrix((1:9), byrow = TRUE, nrow = 3, dimnames = list(c("r1 -> b", "r2 -> b", "r3 -> a"), c("c1 -> z", "c2 -> y", "c3 -> y"))) m#> c1 -> z c2 -> y c3 -> y #> r1 -> b 1 2 3 #> r2 -> b 4 5 6 #> r3 -> a 7 8 9# Aggregation by prefixes does nothing more than rename, because all prefixes are different. # Doing renaming like this (without also aggregating) is potentially dangerous, because # some rows and some columns could end up with same names. aggregate_to_pref_suff_byname(m, keep = "prefix", notation = arrow_notation())#> c1 c2 c3 #> r1 1 2 3 #> r2 4 5 6 #> r3 7 8 9# Aggregation by suffix reduces the number of rows and columns, # because there are same suffixes in both rows and columns aggregate_to_pref_suff_byname(m, keep = "suffix", notation = arrow_notation())#> y z #> a 17 7 #> b 16 5