Android APIs
public final class

StrictMath

extends Object
java.lang.Object
   ↳ java.lang.StrictMath

Class Overview

Class StrictMath provides basic math constants and operations such as trigonometric functions, hyperbolic functions, exponential, logarithms, etc.

In contrast to class Math, the methods in this class return exactly the same results on all platforms. Algorithms based on these methods thus behave the same (e.g. regarding numerical convergence) on all platforms, complying with the slogan "write once, run everywhere". On the other side, the implementation of class StrictMath may be less efficient than that of class Math, as class StrictMath cannot utilize platform specific features such as an extended precision math co-processors.

The methods in this class are specified using the "Freely Distributable Math Library" (fdlibm), version 5.3.

http://www.netlib.org/fdlibm/

Summary

Constants
double E The double value closest to e, the base of the natural logarithm.
double PI The double value closest to pi, the ratio of a circle's circumference to its diameter.
Public Methods
static double IEEEremainder(double x, double y)
Returns the remainder of dividing x by y using the IEEE 754 rules.
static double abs(double d)
Returns the absolute value of the argument.
static long abs(long l)
Returns the absolute value of the argument.
static float abs(float f)
Returns the absolute value of the argument.
static int abs(int i)
Returns the absolute value of the argument.
static double acos(double x)
Returns the closest double approximation of the arc cosine of the argument within the range [0..pi].
static double asin(double x)
Returns the closest double approximation of the arc sine of the argument within the range [-pi/2..pi/2].
static double atan(double x)
Returns the closest double approximation of the arc tangent of the argument within the range [-pi/2..pi/2].
static double atan2(double y, double x)
Returns the closest double approximation of the arc tangent of y/x within the range [-pi..pi].
static double cbrt(double x)
Returns the closest double approximation of the cube root of the argument.
static double ceil(double d)
Returns the double conversion of the most negative (closest to negative infinity) integer value greater than or equal to the argument.
static double copySign(double magnitude, double sign)
Returns a double with the given magnitude and the sign of sign.
static float copySign(float magnitude, float sign)
Returns a float with the given magnitude and the sign of sign.
static double cos(double d)
Returns the closest double approximation of the cosine of the argument.
static double cosh(double x)
Returns the closest double approximation of the hyperbolic cosine of the argument.
static double exp(double x)
Returns the closest double approximation of the raising "e" to the power of the argument.
static double expm1(double x)
Returns the closest double approximation of e d- 1.
static double floor(double d)
Returns the double conversion of the most positive (closest to positive infinity) integer less than or equal to the argument.
static int getExponent(float f)
Returns the exponent of float f.
static int getExponent(double d)
Returns the exponent of double d.
static double hypot(double x, double y)
Returns sqrt(x2+ y2).
static double log(double x)
Returns the closest double approximation of the natural logarithm of the argument.
static double log10(double x)
Returns the closest double approximation of the base 10 logarithm of the argument.
static double log1p(double x)
Returns the closest double approximation of the natural logarithm of the sum of the argument and 1.
static long max(long l1, long l2)
Returns the most positive (closest to positive infinity) of the two arguments.
static int max(int i1, int i2)
Returns the most positive (closest to positive infinity) of the two arguments.
static double max(double d1, double d2)
Returns the most positive (closest to positive infinity) of the two arguments.
static float max(float f1, float f2)
Returns the most positive (closest to positive infinity) of the two arguments.
static int min(int i1, int i2)
Returns the most negative (closest to negative infinity) of the two arguments.
static long min(long l1, long l2)
Returns the most negative (closest to negative infinity) of the two arguments.
static double min(double d1, double d2)
Returns the most negative (closest to negative infinity) of the two arguments.
static float min(float f1, float f2)
Returns the most negative (closest to negative infinity) of the two arguments.
static float nextAfter(float start, double direction)
Returns the next float after start in the given direction .
static double nextAfter(double start, double direction)
Returns the next double after start in the given direction.
static double nextUp(double d)
Returns the next double larger than d.
static float nextUp(float f)
Returns the next float larger than f.
static double pow(double x, double y)
Returns the closest double approximation of the result of raising x to the power of y.
static double random()
Returns a pseudo-random number between 0.0 (inclusive) and 1.0 (exclusive).
static double rint(double d)
Returns the double conversion of the result of rounding the argument to an integer.
static long round(double d)
Returns the result of rounding the argument to an integer.
static int round(float f)
Returns the result of rounding the argument to an integer.
static double scalb(double d, int scaleFactor)
Returns d * 2^scaleFactor.
static float scalb(float d, int scaleFactor)
Returns d * 2^scaleFactor.
static double signum(double d)
Returns the signum function of the argument.
static float signum(float f)
Returns the signum function of the argument.
static double sin(double d)
Returns the closest double approximation of the sine of the argument.
static double sinh(double x)
Returns the closest double approximation of the hyperbolic sine of the argument.
static double sqrt(double d)
Returns the closest double approximation of the square root of the argument.
static double tan(double d)
Returns the closest double approximation of the tangent of the argument.
static double tanh(double x)
Returns the closest double approximation of the hyperbolic tangent of the argument.
static double toDegrees(double angrad)
Returns the measure in degrees of the supplied radian angle.
static double toRadians(double angdeg)
Returns the measure in radians of the supplied degree angle.
static float ulp(float f)
Returns the argument's ulp (unit in the last place).
static double ulp(double d)
Returns the argument's ulp (unit in the last place).
[Expand]
Inherited Methods
From class java.lang.Object

Constants

public static final double E

Added in API level 1

The double value closest to e, the base of the natural logarithm.

Constant Value: 2.718281828459045

public static final double PI

Added in API level 1

The double value closest to pi, the ratio of a circle's circumference to its diameter.

Constant Value: 3.141592653589793

Public Methods

public static double IEEEremainder (double x, double y)

Added in API level 1

Returns the remainder of dividing x by y using the IEEE 754 rules. The result is x-round(x/p)*p where round(x/p) is the nearest integer (rounded to even), but without numerical cancellation problems.

Special cases:

  • IEEEremainder((anything), 0) = NaN
  • IEEEremainder(+infinity, (anything)) = NaN
  • IEEEremainder(-infinity, (anything)) = NaN
  • IEEEremainder(NaN, (anything)) = NaN
  • IEEEremainder((anything), NaN) = NaN
  • IEEEremainder(x, +infinity) = x where x is anything but +/-infinity
  • IEEEremainder(x, -infinity) = x where x is anything but +/-infinity

Parameters
x the numerator of the operation.
y the denominator of the operation.
Returns
  • the IEEE754 floating point reminder of of x/y.

public static double abs (double d)

Added in API level 1

Returns the absolute value of the argument.

Special cases:

  • abs(-0.0) = +0.0
  • abs(+infinity) = +infinity
  • abs(-infinity) = +infinity
  • abs(NaN) = NaN

public static long abs (long l)

Added in API level 1

Returns the absolute value of the argument.

If the argument is Long.MIN_VALUE, Long.MIN_VALUE is returned.

public static float abs (float f)

Added in API level 1

Returns the absolute value of the argument.

Special cases:

  • abs(-0.0) = +0.0
  • abs(+infinity) = +infinity
  • abs(-infinity) = +infinity
  • abs(NaN) = NaN

public static int abs (int i)

Added in API level 1

Returns the absolute value of the argument.

If the argument is Integer.MIN_VALUE, Integer.MIN_VALUE is returned.

public static double acos (double x)

Added in API level 1

Returns the closest double approximation of the arc cosine of the argument within the range [0..pi].

Special cases:

  • acos((anything > 1) = NaN
  • acos((anything < -1) = NaN
  • acos(NaN) = NaN

Parameters
x the value to compute arc cosine of.
Returns
  • the arc cosine of the argument.

public static double asin (double x)

Added in API level 1

Returns the closest double approximation of the arc sine of the argument within the range [-pi/2..pi/2].

Special cases:

  • asin((anything > 1)) = NaN
  • asin((anything < -1)) = NaN
  • asin(NaN) = NaN

Parameters
x the value whose arc sine has to be computed.
Returns
  • the arc sine of the argument.

public static double atan (double x)

Added in API level 1

Returns the closest double approximation of the arc tangent of the argument within the range [-pi/2..pi/2].

Special cases:

  • atan(+0.0) = +0.0
  • atan(-0.0) = -0.0
  • atan(+infinity) = +pi/2
  • atan(-infinity) = -pi/2
  • atan(NaN) = NaN

Parameters
x the value whose arc tangent has to be computed.
Returns
  • the arc tangent of the argument.

public static double atan2 (double y, double x)

Added in API level 1

Returns the closest double approximation of the arc tangent of y/x within the range [-pi..pi]. This is the angle of the polar representation of the rectangular coordinates (x,y).

Special cases:

  • atan2((anything), NaN ) = NaN;
  • atan2(NaN , (anything) ) = NaN;
  • atan2(+0.0, +(anything but NaN)) = +0.0
  • atan2(-0.0, +(anything but NaN)) = -0.0
  • atan2(+0.0, -(anything but NaN)) = +pi
  • atan2(-0.0, -(anything but NaN)) = -pi
  • atan2(+(anything but 0 and NaN), 0) = +pi/2
  • atan2(-(anything but 0 and NaN), 0) = -pi/2
  • atan2(+(anything but infinity and NaN), +infinity) = +0.0
  • atan2(-(anything but infinity and NaN), +infinity) = -0.0
  • atan2(+(anything but infinity and NaN), -infinity) = +pi
  • atan2(-(anything but infinity and NaN), -infinity) = -pi
  • atan2(+infinity, +infinity ) = +pi/4
  • atan2(-infinity, +infinity ) = -pi/4
  • atan2(+infinity, -infinity ) = +3pi/4
  • atan2(-infinity, -infinity ) = -3pi/4
  • atan2(+infinity, (anything but,0, NaN, and infinity)) = +pi/2
  • atan2(-infinity, (anything but,0, NaN, and infinity)) = -pi/2

Parameters
y the numerator of the value whose atan has to be computed.
x the denominator of the value whose atan has to be computed.
Returns
  • the arc tangent of y/x.

public static double cbrt (double x)

Added in API level 1

Returns the closest double approximation of the cube root of the argument.

Special cases:

  • cbrt(+0.0) = +0.0
  • cbrt(-0.0) = -0.0
  • cbrt(+infinity) = +infinity
  • cbrt(-infinity) = -infinity
  • cbrt(NaN) = NaN

Parameters
x the value whose cube root has to be computed.
Returns
  • the cube root of the argument.

public static double ceil (double d)

Added in API level 1

Returns the double conversion of the most negative (closest to negative infinity) integer value greater than or equal to the argument.

Special cases:

  • ceil(+0.0) = +0.0
  • ceil(-0.0) = -0.0
  • ceil((anything in range (-1,0)) = -0.0
  • ceil(+infinity) = +infinity
  • ceil(-infinity) = -infinity
  • ceil(NaN) = NaN

public static double copySign (double magnitude, double sign)

Added in API level 9

Returns a double with the given magnitude and the sign of sign. If sign is NaN, the sign of the result is positive.

public static float copySign (float magnitude, float sign)

Added in API level 9

Returns a float with the given magnitude and the sign of sign. If sign is NaN, the sign of the result is positive.

public static double cos (double d)

Added in API level 1

Returns the closest double approximation of the cosine of the argument.

Special cases:

  • cos(+infinity) = NaN
  • cos(-infinity) = NaN
  • cos(NaN) = NaN

Parameters
d the angle whose cosine has to be computed, in radians.
Returns
  • the cosine of the argument.

public static double cosh (double x)

Added in API level 1

Returns the closest double approximation of the hyperbolic cosine of the argument.

Special cases:

  • cosh(+infinity) = +infinity
  • cosh(-infinity) = +infinity
  • cosh(NaN) = NaN

Parameters
x the value whose hyperbolic cosine has to be computed.
Returns
  • the hyperbolic cosine of the argument.

public static double exp (double x)

Added in API level 1

Returns the closest double approximation of the raising "e" to the power of the argument.

Special cases:

  • exp(+infinity) = +infinity
  • exp(-infinity) = +0.0
  • exp(NaN) = NaN

Parameters
x the value whose exponential has to be computed.
Returns
  • the exponential of the argument.

public static double expm1 (double x)

Added in API level 1

Returns the closest double approximation of e d- 1. If the argument is very close to 0, it is much more accurate to use expm1(d)+1 than exp(d) (due to cancellation of significant digits).

Special cases:

  • expm1(+0.0) = +0.0
  • expm1(-0.0) = -0.0
  • expm1(+infinity) = +infinity
  • expm1(-infinity) = -1.0
  • expm1(NaN) = NaN

Parameters
x the value to compute the ed - 1 of.
Returns
  • the ed- 1 value of the argument.

public static double floor (double d)

Added in API level 1

Returns the double conversion of the most positive (closest to positive infinity) integer less than or equal to the argument.

Special cases:

  • floor(+0.0) = +0.0
  • floor(-0.0) = -0.0
  • floor(+infinity) = +infinity
  • floor(-infinity) = -infinity
  • floor(NaN) = NaN

public static int getExponent (float f)

Added in API level 9

Returns the exponent of float f.

public static int getExponent (double d)

Added in API level 9

Returns the exponent of double d.

public static double hypot (double x, double y)

Added in API level 1

Returns sqrt(x2+ y2). The final result is without medium underflow or overflow.

Special cases:

  • hypot(+infinity, (anything including NaN)) = +infinity
  • hypot(-infinity, (anything including NaN)) = +infinity
  • hypot((anything including NaN), +infinity) = +infinity
  • hypot((anything including NaN), -infinity) = +infinity
  • hypot(NaN, NaN) = NaN

Parameters
x a double number.
y a double number.
Returns
  • the sqrt(x2+ y2) value of the arguments.

public static double log (double x)

Added in API level 1

Returns the closest double approximation of the natural logarithm of the argument.

Special cases:

  • log(+0.0) = -infinity
  • log(-0.0) = -infinity
  • log((anything < 0) = NaN
  • log(+infinity) = +infinity
  • log(-infinity) = NaN
  • log(NaN) = NaN

Parameters
x the value whose log has to be computed.
Returns
  • the natural logarithm of the argument.

public static double log10 (double x)

Added in API level 1

Returns the closest double approximation of the base 10 logarithm of the argument.

Special cases:

  • log10(+0.0) = -infinity
  • log10(-0.0) = -infinity
  • log10((anything < 0) = NaN
  • log10(+infinity) = +infinity
  • log10(-infinity) = NaN
  • log10(NaN) = NaN

Parameters
x the value whose base 10 log has to be computed.
Returns
  • the the base 10 logarithm of x

public static double log1p (double x)

Added in API level 1

Returns the closest double approximation of the natural logarithm of the sum of the argument and 1. If the argument is very close to 0, it is much more accurate to use log1p(d) than log(1.0+d) (due to numerical cancellation).

Special cases:

  • log1p(+0.0) = +0.0
  • log1p(-0.0) = -0.0
  • log1p((anything < 1)) = NaN
  • log1p(-1.0) = -infinity
  • log1p(+infinity) = +infinity
  • log1p(-infinity) = NaN
  • log1p(NaN) = NaN

Parameters
x the value to compute the ln(1+d) of.
Returns
  • the natural logarithm of the sum of the argument and 1.

public static long max (long l1, long l2)

Added in API level 1

Returns the most positive (closest to positive infinity) of the two arguments.

public static int max (int i1, int i2)

Added in API level 1

Returns the most positive (closest to positive infinity) of the two arguments.

public static double max (double d1, double d2)

Added in API level 1

Returns the most positive (closest to positive infinity) of the two arguments.

Special cases:

  • max(NaN, (anything)) = NaN
  • max((anything), NaN) = NaN
  • max(+0.0, -0.0) = +0.0
  • max(-0.0, +0.0) = +0.0

public static float max (float f1, float f2)

Added in API level 1

Returns the most positive (closest to positive infinity) of the two arguments.

Special cases:

  • max(NaN, (anything)) = NaN
  • max((anything), NaN) = NaN
  • max(+0.0, -0.0) = +0.0
  • max(-0.0, +0.0) = +0.0

public static int min (int i1, int i2)

Added in API level 1

Returns the most negative (closest to negative infinity) of the two arguments.

public static long min (long l1, long l2)

Added in API level 1

Returns the most negative (closest to negative infinity) of the two arguments.

public static double min (double d1, double d2)

Added in API level 1

Returns the most negative (closest to negative infinity) of the two arguments.

Special cases:

  • min(NaN, (anything)) = NaN
  • min((anything), NaN) = NaN
  • min(+0.0, -0.0) = -0.0
  • min(-0.0, +0.0) = -0.0

public static float min (float f1, float f2)

Added in API level 1

Returns the most negative (closest to negative infinity) of the two arguments.

Special cases:

  • min(NaN, (anything)) = NaN
  • min((anything), NaN) = NaN
  • min(+0.0, -0.0) = -0.0
  • min(-0.0, +0.0) = -0.0

public static float nextAfter (float start, double direction)

Added in API level 9

Returns the next float after start in the given direction .

public static double nextAfter (double start, double direction)

Added in API level 9

Returns the next double after start in the given direction.

public static double nextUp (double d)

Added in API level 9

Returns the next double larger than d.

public static float nextUp (float f)

Added in API level 9

Returns the next float larger than f.

public static double pow (double x, double y)

Added in API level 1

Returns the closest double approximation of the result of raising x to the power of y.

Special cases:

  • pow((anything), +0.0) = 1.0
  • pow((anything), -0.0) = 1.0
  • pow(x, 1.0) = x
  • pow((anything), NaN) = NaN
  • pow(NaN, (anything except 0)) = NaN
  • pow(+/-(|x| > 1), +infinity) = +infinity
  • pow(+/-(|x| > 1), -infinity) = +0.0
  • pow(+/-(|x| < 1), +infinity) = +0.0
  • pow(+/-(|x| < 1), -infinity) = +infinity
  • pow(+/-1.0 , +infinity) = NaN
  • pow(+/-1.0 , -infinity) = NaN
  • pow(+0.0, (+anything except 0, NaN)) = +0.0
  • pow(-0.0, (+anything except 0, NaN, odd integer)) = +0.0
  • pow(+0.0, (-anything except 0, NaN)) = +infinity
  • pow(-0.0, (-anything except 0, NAN, odd integer)) = +infinity
  • pow(-0.0, (odd integer)) = -pow( +0 , (odd integer) )
  • pow(+infinity, (+anything except 0, NaN)) = +infinity
  • pow(+infinity, (-anything except 0, NaN)) = +0.0
  • pow(-infinity, (anything)) = -pow(0, (-anything))
  • pow((-anything), (integer)) = pow(-1,(integer))*pow(+anything,integer)
  • pow((-anything except 0 and infinity), (non-integer)) = NAN

Parameters
x the base of the operation.
y the exponent of the operation.
Returns
  • x to the power of y.

public static double random ()

Added in API level 1

Returns a pseudo-random number between 0.0 (inclusive) and 1.0 (exclusive).

Returns
  • a pseudo-random number.

public static double rint (double d)

Added in API level 1

Returns the double conversion of the result of rounding the argument to an integer. Tie breaks are rounded towards even.

Special cases:

  • rint(+0.0) = +0.0
  • rint(-0.0) = -0.0
  • rint(+infinity) = +infinity
  • rint(-infinity) = -infinity
  • rint(NaN) = NaN

Parameters
d the value to be rounded.
Returns
  • the closest integer to the argument (as a double).

public static long round (double d)

Added in API level 1

Returns the result of rounding the argument to an integer. The result is equivalent to (long) Math.floor(d+0.5).

Special cases:

  • round(+0.0) = +0.0
  • round(-0.0) = +0.0
  • round((anything > Long.MAX_VALUE) = Long.MAX_VALUE
  • round((anything < Long.MIN_VALUE) = Long.MIN_VALUE
  • round(+infinity) = Long.MAX_VALUE
  • round(-infinity) = Long.MIN_VALUE
  • round(NaN) = +0.0

Parameters
d the value to be rounded.
Returns
  • the closest integer to the argument.

public static int round (float f)

Added in API level 1

Returns the result of rounding the argument to an integer. The result is equivalent to (int) Math.floor(f+0.5).

Special cases:

  • round(+0.0) = +0.0
  • round(-0.0) = +0.0
  • round((anything > Integer.MAX_VALUE) = Integer.MAX_VALUE
  • round((anything < Integer.MIN_VALUE) = Integer.MIN_VALUE
  • round(+infinity) = Integer.MAX_VALUE
  • round(-infinity) = Integer.MIN_VALUE
  • round(NaN) = +0.0

Parameters
f the value to be rounded.
Returns
  • the closest integer to the argument.

public static double scalb (double d, int scaleFactor)

Added in API level 9

Returns d * 2^scaleFactor. The result may be rounded.

public static float scalb (float d, int scaleFactor)

Added in API level 9

Returns d * 2^scaleFactor. The result may be rounded.

public static double signum (double d)

Added in API level 1

Returns the signum function of the argument. If the argument is less than zero, it returns -1.0. If the argument is greater than zero, 1.0 is returned. If the argument is either positive or negative zero, the argument is returned as result.

Special cases:

  • signum(+0.0) = +0.0
  • signum(-0.0) = -0.0
  • signum(+infinity) = +1.0
  • signum(-infinity) = -1.0
  • signum(NaN) = NaN

Parameters
d the value whose signum has to be computed.
Returns
  • the value of the signum function.

public static float signum (float f)

Added in API level 1

Returns the signum function of the argument. If the argument is less than zero, it returns -1.0. If the argument is greater than zero, 1.0 is returned. If the argument is either positive or negative zero, the argument is returned as result.

Special cases:

  • signum(+0.0) = +0.0
  • signum(-0.0) = -0.0
  • signum(+infinity) = +1.0
  • signum(-infinity) = -1.0
  • signum(NaN) = NaN

Parameters
f the value whose signum has to be computed.
Returns
  • the value of the signum function.

public static double sin (double d)

Added in API level 1

Returns the closest double approximation of the sine of the argument.

Special cases:

  • sin(+0.0) = +0.0
  • sin(-0.0) = -0.0
  • sin(+infinity) = NaN
  • sin(-infinity) = NaN
  • sin(NaN) = NaN

Parameters
d the angle whose sin has to be computed, in radians.
Returns
  • the sine of the argument.

public static double sinh (double x)

Added in API level 1

Returns the closest double approximation of the hyperbolic sine of the argument.

Special cases:

  • sinh(+0.0) = +0.0
  • sinh(-0.0) = -0.0
  • sinh(+infinity) = +infinity
  • sinh(-infinity) = -infinity
  • sinh(NaN) = NaN

Parameters
x the value whose hyperbolic sine has to be computed.
Returns
  • the hyperbolic sine of the argument.

public static double sqrt (double d)

Added in API level 1

Returns the closest double approximation of the square root of the argument.

Special cases:

  • sqrt(+0.0) = +0.0
  • sqrt(-0.0) = -0.0
  • sqrt( (anything < 0) ) = NaN
  • sqrt(+infinity) = +infinity
  • sqrt(NaN) = NaN

public static double tan (double d)

Added in API level 1

Returns the closest double approximation of the tangent of the argument.

Special cases:

  • tan(+0.0) = +0.0
  • tan(-0.0) = -0.0
  • tan(+infinity) = NaN
  • tan(-infinity) = NaN
  • tan(NaN) = NaN

Parameters
d the angle whose tangent has to be computed, in radians.
Returns
  • the tangent of the argument.

public static double tanh (double x)

Added in API level 1

Returns the closest double approximation of the hyperbolic tangent of the argument. The absolute value is always less than 1.

Special cases:

  • tanh(+0.0) = +0.0
  • tanh(-0.0) = -0.0
  • tanh(+infinity) = +1.0
  • tanh(-infinity) = -1.0
  • tanh(NaN) = NaN

Parameters
x the value whose hyperbolic tangent has to be computed.
Returns
  • the hyperbolic tangent of the argument

public static double toDegrees (double angrad)

Added in API level 1

Returns the measure in degrees of the supplied radian angle. The result is angrad * 180 / pi.

Special cases:

  • toDegrees(+0.0) = +0.0
  • toDegrees(-0.0) = -0.0
  • toDegrees(+infinity) = +infinity
  • toDegrees(-infinity) = -infinity
  • toDegrees(NaN) = NaN

Parameters
angrad an angle in radians.
Returns
  • the degree measure of the angle.

public static double toRadians (double angdeg)

Added in API level 1

Returns the measure in radians of the supplied degree angle. The result is angdeg / 180 * pi.

Special cases:

  • toRadians(+0.0) = +0.0
  • toRadians(-0.0) = -0.0
  • toRadians(+infinity) = +infinity
  • toRadians(-infinity) = -infinity
  • toRadians(NaN) = NaN

Parameters
angdeg an angle in degrees.
Returns
  • the radian measure of the angle.

public static float ulp (float f)

Added in API level 1

Returns the argument's ulp (unit in the last place). The size of a ulp of a float value is the positive distance between this value and the float value next larger in magnitude. For non-NaN x, ulp(-x) == ulp(x).

Special cases:

  • ulp(+0.0) = Float.MIN_VALUE
  • ulp(-0.0) = Float.MIN_VALUE
  • ulp(+infinity) = infinity
  • ulp(-infinity) = infinity
  • ulp(NaN) = NaN

Parameters
f the floating-point value to compute ulp of.
Returns
  • the size of a ulp of the argument.

public static double ulp (double d)

Added in API level 1

Returns the argument's ulp (unit in the last place). The size of a ulp of a double value is the positive distance between this value and the double value next larger in magnitude. For non-NaN x, ulp(-x) == ulp(x).

Special cases:

  • ulp(+0.0) = Double.MIN_VALUE
  • ulp(-0.0) = Double.MIN_VALUE
  • ulp(+infinity) = infinity
  • ulp(-infinity) = infinity
  • ulp(NaN) = NaN

Parameters
d the floating-point value to compute ulp of.
Returns
  • the size of a ulp of the argument.
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