References to java arrays that are guaranteed to be rectangular, i.e similar
to R arrays
Objects from the Class
Objects of this class should *not* be created directly.
Instead, they usually come as a result of a java method call.
Slots
jsig:
JNI signature of the array type
jobj:
Internal identifier of the object
jclass:
Inherited from jobjRef, but unspecified
dimension:
dimension vector of the array
Extends
Class "jarrayRef", directly.
Class "jobjRef", by class "jarrayRef", distance 2.
Methods
length
signature(x = "jrectRef"): The number of elements in the array.
Note that if the array has more than one dimension,
it gives the number of arrays in the first dimension, and not the total
number of atomic objects in tha array (like R does). This gives what would be
returned by array.length in java.
str
signature(object = "jrectRef"): ...
[
signature(x = "jrectRef"): R indexing of rectangular java arrays
dim
signature(x = "jrectRef"): extracts the dimensions of the array
dim<-
signature(x = "jrectRef"): sets the dimensions of the array
unique
signature(x = "jrectRef"): unique objects in the array
duplicated
signature(x = "jrectRef"): see duplicated
anyDuplicated
signature(x = "jrectRef"): see anyDuplicated
sort
signature(x = "jrectRef"): returns a new array with elements from x in order
rev
signature(x = "jrectRef"): returns a new array with elements from x reversed
min
signature(x = "jrectRef"): the smallest object in the array (in the sense of the Comparable interface)
max
signature(x = "jrectRef"): the biggest object in the array (in the sense of the Comparable interface)
range
signature(x = "jrectRef"): the range of the array (in the sense of the Comparable interface)
Examples
v <- new( J("java.util.Vector") )
v$add( "hello" )
v$add( "world" )
v$add( new( J("java.lang.Double"), "10.2" ) )
array <- v$toArray()
array[ c(TRUE,FALSE,TRUE) ]
array[ 1:2 ]
array[ -3 ]
# length
length( array )
# also works as a pseudo field as in java
array$length