.jfloat
marks a numberic vector as an object that can be used
as parameter to Java calls that require float
parameters.
Similarly, .jlong
marks a numeric vector as long
parameter..jfloat(x)
.jlong(x)
.jbyte(x)
.jchar(x)
jfloat
, jlong
,
jbyte
or jchar
that can be used as parameter to Java calls that require
float
, long
, byte
or char
parameters
respectively.float
or long
type. Numeric vectors are
stored as double
s, hence there is no native way to pass float
numbers to Java methods. The .jfloat
call marks a numeric
vector as having the Java type float
by wrapping it in the
jfloat
class. The class is still a subclass of numeric
,
therefore all regular R operations are unaffected by this. Similarly, .jlong
is used to mark a numeric vector as a
parameter of the long
Java type. Please note that in general R
has no native type that will hold a long
value, so conversion
between Java's long
type and R's numeric is potentially lossy.
.jbyte
is used when a scalar byte is to be passed ot Java. Note
that byte arrays are natively passed as RAW vectors, not as
.jbyte
arrays.
jchar
is strictly experimental and may be based on
character
vectors in the future.
.jcall
, jfloat-class