org.rosuda.REngine
Class REXPLogical

java.lang.Object
  org.rosuda.REngine.REXP
      org.rosuda.REngine.REXPVector
          org.rosuda.REngine.REXPLogical

public class REXPLogical
extends REXPVector

REXPLogical represents a vector of logical values (TRUE, FALSE or NA). Unlike Java's boolean type R's logicals support NA values therefore either of isTRUE(), isFALSE() or isNA() must be used to convert logicals to boolean values.

Field Summary

static byte	FALSE
static byte	NA NA boolean value as used in REXPLogical implementation.
protected byte[]	payload
static byte	TRUE

Fields inherited from class org.rosuda.REngine.REXP

attr, maxDebugItems

Constructor Summary

REXPLogical(boolean load)
create logical vector of the length 1 with the given value as its first (and only) element

REXPLogical(boolean[] load)
create logical vector with the payload specified by load

REXPLogical(boolean[] load, REXPList attr)
create integer vector with the payload specified by load and attributes attr

REXPLogical(byte load)
create logical vector of the length 1 with the given value as its first (and only) element

REXPLogical(byte[] load)
create logical vector with the payload specified by load

REXPLogical(byte[] load, REXPList attr)
create integer vector with the payload specified by load and attributes attr

Method Summary

byte[]	asBytes() returns the contents as an array of bytes (if supported by the represented object)
double[]	asDoubles() returns the contents of this vector as doubles
int[]	asIntegers() returns the contents as an array of integers (if supported by the represented object)
java.lang.Object	asNativeJavaObject() attempt to represent the REXP by a native Java object and return it.
java.lang.String[]	asStrings() returns the contents of this vector as strings
boolean[]	isFalse() Deprecated. replaced by isTRUE() for consistency with R nomenclature.
boolean[]	isFALSE() returns a boolean array of the same langth as the receiver with true for FALSE values and false for TRUE and NA values.
boolean	isLogical() check whether the REXP object is a logical vector
boolean[]	isNA() returns a boolean vector of the same length as this vector with true for NA values and false for any other values
static boolean	isNA(byte value)
boolean[]	isTrue() Deprecated. replaced by isTRUE() for consistency with R nomenclature.
boolean[]	isTRUE() returns a boolean array of the same langth as the receiver with true for TRUE values and false for FALSE and NA values.
int	length() returns the length of the vector (i.e. the number of elements)
java.lang.String	toDebugString() returns representation that it useful for debugging (e.g. it includes attributes and may include vector values -- see REXP.maxDebugItems)

Methods inherited from class org.rosuda.REngine.REXPVector

isVector, toString

Methods inherited from class org.rosuda.REngine.REXP

_attr, asDouble, asDoubleMatrix, asFactor, asInteger, asList, asString, createDataFrame, createDoubleMatrix, dim, getAttribute, hasAttribute, inherits, isComplex, isEnvironment, isExpression, isFactor, isInteger, isLanguage, isList, isNull, isNumeric, isPairList, isRaw, isRecursive, isReference, isString, isSymbol

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

payload

protected byte[] payload

NA

public static final byte NA

NA boolean value as used in REXPLogical implementation. This differs from the value used in R since R uses int data type and we use byte. Unlike its real equivalent this one can be used in comparisons, although isNA(byte) is provided for consistency.

See Also:

Constant Field Values

TRUE

public static final byte TRUE

See Also:

Constant Field Values

FALSE

public static final byte FALSE

See Also:

Constant Field Values

Constructor Detail

REXPLogical

public REXPLogical(boolean load)

create logical vector of the length 1 with the given value as its first (and only) element

REXPLogical

public REXPLogical(byte load)

create logical vector of the length 1 with the given value as its first (and only) element

REXPLogical

public REXPLogical(byte[] load)

create logical vector with the payload specified by load

REXPLogical

public REXPLogical(boolean[] load)

create logical vector with the payload specified by load

REXPLogical

public REXPLogical(byte[] load,
                   REXPList attr)

create integer vector with the payload specified by load and attributes attr

REXPLogical

public REXPLogical(boolean[] load,
                   REXPList attr)

create integer vector with the payload specified by load and attributes attr

Method Detail

isNA

public static boolean isNA(byte value)

length

public int length()

Description copied from class: REXPVector

returns the length of the vector (i.e. the number of elements)

Specified by:

length in class REXPVector

Returns:

length of the vector

isLogical

public boolean isLogical()

Description copied from class: REXP

check whether the REXP object is a logical vector

Overrides:

isLogical in class REXP

Returns:

true if the receiver is a logical vector, false otherwise

asNativeJavaObject

public java.lang.Object asNativeJavaObject()

Description copied from class: REXP

attempt to represent the REXP by a native Java object and return it. Note that this may lead to loss of information (e.g., factors may be returned as a string array) and attributes are ignored. Not all R types can be converted to native Java objects. Also note that R has no concept of scalars, so vectors of length 1 will always be returned as an arrays (i.e., int[1] and not Integer).

Overrides:

asNativeJavaObject in class REXP

asIntegers

public int[] asIntegers()

Description copied from class: REXP

returns the contents as an array of integers (if supported by the represented object)

Overrides:

asIntegers in class REXP

asBytes

public byte[] asBytes()

Description copied from class: REXP

returns the contents as an array of bytes (if supported by the represented object)

Overrides:

asBytes in class REXP

asDoubles

public double[] asDoubles()

returns the contents of this vector as doubles

Overrides:

asDoubles in class REXP

asStrings

public java.lang.String[] asStrings()

returns the contents of this vector as strings

Overrides:

asStrings in class REXP

isNA

public boolean[] isNA()

Description copied from class: REXPVector

returns a boolean vector of the same length as this vector with true for NA values and false for any other values

Overrides:

isNA in class REXPVector

Returns:

a boolean vector of the same length as this vector with true for NA values and false for any other values

isTRUE

public boolean[] isTRUE()

returns a boolean array of the same langth as the receiver with true for TRUE values and false for FALSE and NA values.

Returns:

boolean array

isFALSE

public boolean[] isFALSE()

returns a boolean array of the same langth as the receiver with true for FALSE values and false for TRUE and NA values.

Returns:

boolean array

isTrue

public boolean[] isTrue()

Deprecated. replaced by isTRUE() for consistency with R nomenclature.

returns a boolean array of the same langth as the receiver with true for TRUE values and false for FALSE and NA values.

Returns:

boolean array

isFalse

public boolean[] isFalse()

Deprecated. replaced by isTRUE() for consistency with R nomenclature.

returns a boolean array of the same langth as the receiver with true for FALSE values and false for TRUE and NA values.

Returns:

boolean array

toDebugString

public java.lang.String toDebugString()

Description copied from class: REXP

returns representation that it useful for debugging (e.g. it includes attributes and may include vector values -- see REXP.maxDebugItems)

Overrides:

toDebugString in class REXPVector

Returns:

extended description of the obejct -- it may include vector values