Enum Class MathOp

java.lang.Object

java.lang.Enum<MathOp>

io.jenetics.prog.op.MathOp

All Implemented Interfaces:

Op<Double>, Serializable, Comparable<MathOp>, Constable, Function<Double[],Double>, Supplier<Op<Double>>

public enum MathOp
extends Enum<MathOp>
implements Op<Double>

This class contains operations for performing basic numeric operations.

Since:

3.9

Version:

5.0

See Also:

• Math

Nested Class Summary

Nested classes/interfaces inherited from class Enum

Enum.EnumDesc<E>

Enum Constant Summary

Enum Constants

Enum Constant	Description
ABS	Return the absolute value of a double value.
ACOS	Returns the arc cosine of a double value.
ADD	Returns the sum of its arguments.
ASIN	Returns the arc sine of a double value.
ATAN	Returns the arc tangent of a value.
CBRT	Returns the cube root of a double value.
CEIL	Returns the smallest (closest to negative infinity) double value that is greater than or equal to the argument and is equal to a mathematical integer.
COS	Returns the trigonometric cosine of an angle.
COSH	Returns the hyperbolic cosine of a double value.
DIV	Returns the quotient of its arguments.
EXP	Returns Euler's number e raised to the power of a double value.
FLOOR	Returns the largest (closest to positive infinity) double value that is less than or equal to the argument and is equal to a mathematical integer.
GT	Returns +1.0 if its first argument is greater than its second argument and returns -1.0 otherwise.
HYPOT	Returns sqrt(x2 +y2) without intermediate overflow or underflow.
ID	The identity function.
LOG	Returns the natural logarithm (base e) of a double value.
LOG10	Returns the base 10 logarithm of a double value.
MAX	Return the maximum of two values This operation has arity 2.
MIN	Return the minimum of two values.
MOD	Returns the modulo of its arguments.
MUL	Returns the product of its arguments.
NEG	Return the negation value of a double value.
POW	Returns the value of the first argument raised to the power of the second argument.
RINT	Returns the double value that is closest in value to the argument and is equal to a mathematical integer.
SIGNUM	Returns the signum function of the argument; zero if the argument is zero, 1.0 if the argument is greater than zero, -1.0 if the argument is less than zero.
SIN	Returns the trigonometric sine of an angle.
SINH	Returns the hyperbolic sine of a double value.
SQR	Returns the square value of a given double value.
SQRT	Returns the correctly rounded positive square root of a double value.
SUB	Return the diff of its arguments.
TAN	Returns the trigonometric tangent of an angle.
TANH	Returns the hyperbolic tangent of a double value.

Field Summary

Fields

Modifier and Type	Field	Description
static final Const<Double>	E	The double value that is closer than any other to e, the base of the natural logarithms.
static final Set<String>	NAMES	The names of all defined operation names.
static final Const<Double>	PI	The double value that is closer than any other to pi, the ratio of the circumference of a circle to its diameter.

Method Summary

Modifier and Type	Method	Description
Double	apply(Double[] args)
int	arity()	Return the arity of the operation function.
double	eval(double... args)	Evaluates the operation with the given arguments.
static Op<Double>	toMathOp(String string)	Converts the string representation of an operation to the operation object.
String	toString()
static MathOp	valueOf(String name)	Returns the enum constant of this class with the specified name.
static MathOp[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods inherited from class Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, valueOf

Methods inherited from class Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface Function

andThen, compose

Methods inherited from interface Op

get, isTerminal, name

Enum Constant Details

ABS

public static final MathOp ABS

Return the absolute value of a double value. This operation has arity 1.

See Also:

• Math.abs(double)

NEG

public static final MathOp NEG

Return the negation value of a double value. This operation has arity 1.

ID

public static final MathOp ID

The identity function.

MIN

public static final MathOp MIN

Return the minimum of two values. This operation has arity 2.

See Also:

• Math.min(double, double)

MAX

public static final MathOp MAX

Return the maximum of two values This operation has arity 2.

See Also:

• Math.max(double, double)

CEIL

public static final MathOp CEIL

Returns the smallest (closest to negative infinity) double value that is greater than or equal to the argument and is equal to a mathematical integer. This operation has arity 1.

See Also:

• Math.ceil(double)

FLOOR

public static final MathOp FLOOR

Returns the largest (closest to positive infinity) double value that is less than or equal to the argument and is equal to a mathematical integer. This operation has arity 1.

See Also:

• Math.floor(double)

SIGNUM

public static final MathOp SIGNUM

Returns the signum function of the argument; zero if the argument is zero, 1.0 if the argument is greater than zero, -1.0 if the argument is less than zero. This operation has arity 1.

See Also:

• Math.signum(double)

RINT

public static final MathOp RINT

Returns the double value that is closest in value to the argument and is equal to a mathematical integer. This operation has arity 1.

See Also:

• Math.rint(double)

ADD

public static final MathOp ADD

Returns the sum of its arguments. This operation has arity 2.

SUB

public static final MathOp SUB

Return the diff of its arguments. This operation has arity 2.

MUL

public static final MathOp MUL

Returns the product of its arguments. This operation has arity 2.

DIV

public static final MathOp DIV

Returns the quotient of its arguments. This operation has arity 2.

MOD

public static final MathOp MOD

Returns the modulo of its arguments. This operation has arity 2.

POW

public static final MathOp POW

Returns the value of the first argument raised to the power of the second argument. This operation has arity 2.

See Also:

• Math.pow(double, double)

SQR

public static final MathOp SQR

Returns the square value of a given double value. This operation has arity 1.

SQRT

public static final MathOp SQRT

Returns the correctly rounded positive square root of a double value. This operation has arity 1.

See Also:

• Math.sqrt(double)

CBRT

public static final MathOp CBRT

Returns the cube root of a double value. This operation has arity 1.

See Also:

• Math.cbrt(double)

HYPOT

public static final MathOp HYPOT

Returns sqrt(x² +y²) without intermediate overflow or underflow. This operation has arity 2.

See Also:

• Math.hypot(double, double)

EXP

public static final MathOp EXP

Returns Euler's number e raised to the power of a double value. This operation has arity 1.

See Also:

• Math.exp(double)

LOG

public static final MathOp LOG

Returns the natural logarithm (base e) of a double value. This operation has arity 1.

See Also:

• Math.log(double)

LOG10

public static final MathOp LOG10

Returns the base 10 logarithm of a double value. This operation has arity 1.

See Also:

• Math.log10(double)

SIN

public static final MathOp SIN

Returns the trigonometric sine of an angle. This operation has arity 1.

See Also:

• Math.sin(double)

COS

public static final MathOp COS

Returns the trigonometric cosine of an angle. This operation has arity 1.

See Also:

• Math.cos(double)

TAN

public static final MathOp TAN

Returns the trigonometric tangent of an angle. This operation has arity 1.

See Also:

• Math.tan(double)

ACOS

public static final MathOp ACOS

Returns the arc cosine of a double value. This operation has arity 1.

See Also:

• Math.acos(double)

ASIN

public static final MathOp ASIN

Returns the arc sine of a double value. This operation has arity 1.

See Also:

• Math.asin(double)

ATAN

public static final MathOp ATAN

Returns the arc tangent of a value. This operation has arity 1.

See Also:

• Math.atan(double)

COSH

public static final MathOp COSH

Returns the hyperbolic cosine of a double value. This operation has arity 1.

See Also:

• Math.cosh(double)

SINH

public static final MathOp SINH

Returns the hyperbolic sine of a double value. This operation has arity 1.

See Also:

• Math.sinh(double)

TANH

public static final MathOp TANH

Returns the hyperbolic tangent of a double value. This operation has arity 1.

See Also:

• Math.tanh(double)

GT

public static final MathOp GT

Returns +1.0 if its first argument is greater than its second argument and returns -1.0 otherwise.

Since:

5.0

Field Details

PI

public static final Const<Double> PI

The double value that is closer than any other to pi, the ratio of the circumference of a circle to its diameter. This is a terminal operation.

See Also:

• Math.PI

E

public static final Const<Double> E

The double value that is closer than any other to e, the base of the natural logarithms. This is a terminal operation.

See Also:

• Math.E

NAMES

public static final Set<String> NAMES

The names of all defined operation names.

Since:

7.0

Method Details

values

public static MathOp[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static MathOp valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null

arity

public int arity()

Description copied from interface: Op

Return the arity of the operation function. If the arity is zero, the operation is terminal operation.

Specified by:

arity in interface Op<Double>

Returns:

the arity of the operation

apply

public Double apply(Double[] args)

Specified by:

apply in interface Function<Double[],Double>

eval

public double eval(double... args)

Evaluates the operation with the given arguments.

Parameters:

args - the operation arguments

Returns:

the evaluated operation

Since:

5.0

See Also:

• apply(Double[])

toString

public String toString()

Overrides:

toString in class Enum<MathOp>

toMathOp

public static Op<Double> toMathOp(String string)

Converts the string representation of an operation to the operation object. It is used for converting the string representation of a tree to an operation tree. If you use it that way, you should not forget to re-index the tree variables.

final TreeNode<Op<Double>> tree = TreeNode.parse(
    "add(mul(x,y),sub(y,x))",
    MathOp::toMathOp
);

assert Program.eval(tree, 10.0, 5.0) == 100.0;
Var.reindex(tree);
assert Program.eval(tree, 10.0, 5.0) == 45.0;

Parameters:

string - the string representation of an operation which should be converted

Returns:

the operation, converted from the given string

Throws:

IllegalArgumentException - if the given value doesn't represent a mathematical expression

NullPointerException - if the given string value is null

Since:

5.0

See Also:

• Var.reindex(TreeNode)
• Program.eval(Tree, Object[])