mvbutils-operators {mvbutils} | R Documentation |
Succinct or convenience operators
a %&% b a %!in% b x %is.not.a% what x %is.a% what x %is.not.an% what x %is.an% what vector %except% condition x %matching% patt x %without.name% what a %in.range% b from %upto% to from %downto% to x %where% cond
a, b, vector, condition, x, what, patt, from, to, cond |
see "Arguments By Function" below. |
%&% |
string concatenation via paste( a, b, sep="") |
%!in% |
logical negation of %in% |
%is.a% |
(and %is.not.a% , %is.an% , %is.not.an% ) result of inherits to test class membership |
%except% |
vector except those elements that match something in condition |
%matching% |
those elements in x which are regexp-matched with any of the patt s |
%without.name% |
x except those elements whose names match what |
%in.range% |
those elements of a that are >=min(b) and <=max(b) |
%upto% |
like : except that if to<from , numeric(0) is returned (useful for coding for-loops) |
%downto% |
converse of %upto% |
%where% |
those rows of the data.frame x where cond is satisfied (see DETAILS) |
paste
d with no separatoreval
ed in context of x
, then in the calling frame of %where%
(or .GlobalEnv). Wrap cond
in parentheses to avoid trouble with operator precedence.names
attributeMark Bravington
"a" %&% "b" # "ab" 1:5 %!in% 3:4 # c( TRUE, TRUE, FALSE, FALSE, TRUE) trf <- try( 1+"nonsense") if( trf %is.not.a% "try-error") cat( "OK\n") else cat( "not OK\n") 1:5 %except% c(2,4,6) # c(1,3,5) c( alpha=1, beta=2) %without.name% "alpha" # c( beta=2) 1:5 %in.range% c( 2, 4) # c(F,T,T,T,F) c( "cat", "hat", "dog", "brick") %matching% c( "at", "ic") # cat hat brick 1 %upto% 2 # 1:2 1 %upto% 0 # numeric( 0); using %upto% rather than : in for-loops can simplify coding 1 %downto% 0 # 1:0 1 %downto% 2 # numeric( 0) ff <- function( which.row) { x <- data.frame( a=1:3, b=4:6) x %where% (a==which.row) } ff( 2) # data.frame( a=2, b=5)