18 KiB
Nums
Tomo has two floating point number types: Num (64-bit, AKA double) and
Num32 (32-bit, AKA float). Num literals can have a decimal point (e.g.
5.), a scientific notation suffix (e.g. 1e8) or a percent sign. Numbers
that end in a percent sign are divided by 100 at compile time (i.e. 5% == 0.05). Numbers can also use the deg suffix to represent degrees, which
are converted to radians at compile time (i.e. 180deg == Nums.PI).
Nums support the standard math operations (x+y, x-y, x*y, x/y) as well as
powers/exponentiation (x^y) and modulus (x mod y and x mod1 y).
Num Functions
Each Num type has its own version of the following functions. Functions can be
called either on the type itself: Num.sqrt(x) or as a method call:
x:sqrt(). Method call syntax is preferred.
Constants
1_PI:\frac{1}{\pi}2_PI:2 \times \pi2_SQRTPI:2 \times \sqrt{\pi}E: Base of natural logarithms (e)INF: Positive infinityLN10: Natural logarithm of 10LN2: Natural logarithm of 2LOG2E: Logarithm base 2 ofePI: Pi (\pi)PI_2:\frac{\pi}{2}PI_4:\frac{\pi}{4}SQRT1_2:\sqrt{\frac{1}{2}}SQRT2:\sqrt{2}TAU: Tau (2 \times \pi)
Functions
abs
Description: Calculates the absolute value of a number.
Signature:
func abs(n: Num -> Num)
Parameters:
n: The number whose absolute value is to be computed.
Returns:
The absolute value of n.
Example:
>> -3.5:abs()
= 3.5
acos
Description: Computes the arc cosine of a number.
Signature:
func acos(x: Num -> Num)
Parameters:
x: The number for which the arc cosine is to be calculated.
Returns:
The arc cosine of x in radians.
Example:
>> 0.0:acos() // -> (π/2)
= 1.5708
acosh
Description: Computes the inverse hyperbolic cosine of a number.
Signature:
func acosh(x: Num -> Num)
Parameters:
x: The number for which the inverse hyperbolic cosine is to be calculated.
Returns:
The inverse hyperbolic cosine of x.
Example:
>> 1.0:acosh()
= 0
asin
Description: Computes the arc sine of a number.
Signature:
func asin(x: Num -> Num)
Parameters:
x: The number for which the arc sine is to be calculated.
Returns:
The arc sine of x in radians.
Example:
>> 0.5:asin() // -> (π/6)
= 0.5236
asinh
Description: Computes the inverse hyperbolic sine of a number.
Signature:
func asinh(x: Num -> Num)
Parameters:
x: The number for which the inverse hyperbolic sine is to be calculated.
Returns:
The inverse hyperbolic sine of x.
Example:
>> 0.0:asinh()
= 0
atan2
Description: Computes the arc tangent of the quotient of two numbers.
Signature:
func atan2(x: Num, y: Num -> Num)
Parameters:
x: The numerator.y: The denominator.
Returns:
The arc tangent of x/y in radians.
Example:
>> Num.atan2(1, 1) // -> (π/4)
= 0.7854
atan
Description: Computes the arc tangent of a number.
Signature:
func atan(x: Num -> Num)
Parameters:
x: The number for which the arc tangent is to be calculated.
Returns:
The arc tangent of x in radians.
Example:
>> 1.0:atan() // -> (π/4)
= 0.7854
atanh
Description: Computes the inverse hyperbolic tangent of a number.
Signature:
func atanh(x: Num -> Num)
Parameters:
x: The number for which the inverse hyperbolic tangent is to be calculated.
Returns:
The inverse hyperbolic tangent of x.
Example:
>> 0.5:atanh()
= 0.5493
cbrt
Description: Computes the cube root of a number.
Signature:
func cbrt(x: Num -> Num)
Parameters:
x: The number for which the cube root is to be calculated.
Returns:
The cube root of x.
Example:
>> 27.0:cbrt()
= 3
ceil
Description: Rounds a number up to the nearest integer.
Signature:
func ceil(x: Num -> Num)
Parameters:
x: The number to be rounded up.
Returns:
The smallest integer greater than or equal to x.
Example:
>> 3.2:ceil()
= 4
copysign
Description: Copies the sign of one number to another.
Signature:
func copysign(x: Num, y: Num -> Num)
Parameters:
x: The number whose magnitude will be copied.y: The number whose sign will be copied.
Returns:
A number with the magnitude of x and the sign of y.
Example:
>> 3.0:copysign(-1)
= -3
cos
Description: Computes the cosine of a number (angle in radians).
Signature:
func cos(x: Num -> Num)
Parameters:
x: The angle in radians.
Returns:
The cosine of x.
Example:
>> 0.0:cos()
= 1
cosh
Description: Computes the hyperbolic cosine of a number.
Signature:
func cosh(x: Num -> Num)
Parameters:
x: The number for which the hyperbolic cosine is to be calculated.
Returns:
The hyperbolic cosine of x.
Example:
>> 0.0:cosh()
= 1
erf
Description: Computes the error function of a number.
Signature:
func erf(x: Num -> Num)
Parameters:
x: The number for which the error function is to be calculated.
Returns:
The error function of x.
Example:
>> 0.0:erf()
= 0
erfc
Description: Computes the complementary error function of a number.
Signature:
func erfc(x: Num -> Num)
Parameters:
x: The number for which the complementary error function is to be calculated.
Returns:
The complementary error function of x.
Example:
>> 0.0:erfc()
= 1
exp2
Description:
Computes 2^x for a number.
Signature:
func exp2(x: Num -> Num)
Parameters:
x: The exponent.
Returns:
The value of 2^x.
Example:
>> 3.0:exp2()
= 8
exp
Description:
Computes the exponential function e^x for a number.
Signature:
func exp(x: Num -> Num)
Parameters:
x: The exponent.
Returns:
The value of e^x.
Example:
>> 1.0:exp()
= 2.7183
expm1
Description:
Computes e^x - 1 for a number.
Signature:
func expm1(x: Num -> Num)
Parameters:
x: The exponent.
Returns:
The value of e^x - 1.
Example:
>> 1.0:expm1()
= 1.7183
fdim
Description: Computes the positive difference between two numbers.
Signature:
func fdim(x: Num, y: Num -> Num)
Parameters:
x: The first number.y: The second number.
Returns:
The positive difference \max(0, x - y).
Example:
fd
>> 5.0:fdim(3)
= 2
floor
Description: Rounds a number down to the nearest integer.
Signature:
func floor(x: Num -> Num)
Parameters:
x: The number to be rounded down.
Returns:
The largest integer less than or equal to x.
Example:
>> 3.7:floor()
= 3
format
Description: Formats a number as a string with a specified precision.
Signature:
func format(n: Num, precision: Int = 0 -> Text)
Parameters:
n: The number to be formatted.precision: The number of decimal places. Default is0.
Returns: A string representation of the number with the specified precision.
Example:
>> 3.14159:format(precision=2)
= "3.14"
from_text
Description: Converts a string representation of a number into a floating-point number.
Signature:
func from_text(text: Text, the_rest: Text = "!&Text" -> Num)
Parameters:
text: The string containing the number.the_rest: A string indicating what to return if the conversion fails. Default is"!&Text".
Returns: The number represented by the string.
Example:
>> Num.from_text("3.14")
= 3.14
>> Num.from_text("1e3")
= 1000
hypot
Description:
Computes the Euclidean norm, \sqrt{x^2 + y^2}, of two numbers.
Signature:
func hypot(x: Num, y: Num -> Num)
Parameters:
x: The first number.y: The second number.
Returns:
The Euclidean norm of x and y.
Example:
>> Num.hypot(3, 4)
= 5
isfinite
Description: Checks if a number is finite.
Signature:
func isfinite(n: Num -> Bool)
Parameters:
n: The number to be checked.
Returns:
yes if n is finite, no otherwise.
Example:
>> 1.0:isfinite()
= yes
>> Num.INF:isfinite()
= no
isinf
Description: Checks if a number is infinite.
Signature:
func isinf(n: Num -> Bool)
Parameters:
n: The number to be checked.
Returns:
yes if n is infinite, no otherwise.
Example:
>> Num.INF:isinf()
= yes
>> 1.0:isinf()
= no
isnan
Description: Checks if a number is NaN (Not a Number).
Signature:
func isnan(n: Num -> Bool)
Parameters:
n: The number to be checked.
Returns:
yes if n is NaN, no otherwise.
Example:
>> Num.nan():isnan()
= yes
>> 1.0:isnan()
= no
j0
Description: Computes the Bessel function of the first kind of order 0.
Signature:
func j0(x: Num -> Num)
Parameters:
x: The number for which the Bessel function is to be calculated.
Returns:
The Bessel function of the first kind of order 0 of x.
Example:
>> 0.0:j0()
= 1
j1
Description: Computes the Bessel function of the first kind of order 1.
Signature:
func j1(x: Num -> Num)
Parameters:
x: The number for which the Bessel function is to be calculated.
Returns:
The Bessel function of the first kind of order 1 of x.
Example:
>> 0.0:j1()
= 0
log10
Description: Computes the base-10 logarithm of a number.
Signature:
func log10(x: Num -> Num)
Parameters:
x: The number for which the base-10 logarithm is to be calculated.
Returns:
The base-10 logarithm of x.
Example:
>> 100.0:log10()
= 2
log1p
Description:
Computes \log(1 + x) for a number.
Signature:
func log1p(x: Num -> Num)
Parameters:
x: The number for which\log(1 + x)is to be calculated.
Returns:
The value of \log(1 + x).
Example:
>> 1.0:log1p()
= 0.6931
log2
Description: Computes the base-2 logarithm of a number.
Signature:
func log2(x: Num -> Num)
Parameters:
x: The number for which the base-2 logarithm is to be calculated.
Returns:
The base-2 logarithm of x.
Example:
>> 8.0:log2()
= 3
log
Description:
Computes the natural logarithm (base e) of a number.
Signature:
func log(x: Num -> Num)
Parameters:
x: The number for which the natural logarithm is to be calculated.
Returns:
The natural logarithm of x.
Example:
>> Num.E:log()
= 1
logb
Description: Computes the binary exponent (base-2 logarithm) of a number.
Signature:
func logb(x: Num -> Num)
Parameters:
x: The number for which the binary exponent is to be calculated.
Returns:
The binary exponent of x.
Example:
>> 8.0:logb()
= 3
mix
Description: Interpolates between two numbers based on a given amount.
Signature:
func mix(amount: Num, x: Num, y: Num -> Num)
Parameters:
amount: The interpolation factor (between0and1).x: The starting number.y: The ending number.
Returns:
The interpolated number between x and y based on amount.
Example:
>> 0.5:mix(10, 20)
= 15
>> 0.25:mix(10, 20)
= 12.5
nan
Description: Generates a NaN (Not a Number) value.
Signature:
func nan(tag: Text = "" -> Num)
Parameters:
tag: An optional tag to describe the NaN. Default is an empty string.
Returns: A NaN value.
Example:
>> Num.nan()
= NaN
near
Description: Checks if two numbers are approximately equal within specified tolerances. If two numbers are within an absolute difference or the ratio between the two is small enough, they are considered near each other.
Signature:
func near(x: Num, y: Num, ratio: Num = 1e-9, min_epsilon: Num = 1e-9 -> Bool)
Parameters:
x: The first number.y: The second number.ratio: The relative tolerance. Default is1e-9.min_epsilon: The absolute tolerance. Default is1e-9.
Returns:
yes if x and y are approximately equal within the specified tolerances, no otherwise.
Example:
>> 1.0:near(1.000000001)
= yes
>> 100.0:near(110, ratio=0.1)
= yes
>> 5.0:near(5.1, min_epsilon=0.1)
= yes
nextafter
Description: Computes the next representable value after a given number towards a specified direction.
Signature:
func nextafter(x: Num, y: Num -> Num)
Parameters:
x: The starting number.y: The direction towards which to find the next representable value.
Returns:
The next representable value after x in the direction of y.
Example:
>> 1.0:nextafter(1.1)
= 1.0000000000000002
random
Description: Generates a random floating-point number.
Signature:
func random(->Num)
Parameters: None
Returns: A random floating-point number between 0 and 1.
Example:
>> Num.random()
= 0.4521
rint
Description: Rounds a number to the nearest integer, with ties rounded to the nearest even integer.
Signature:
func rint(x: Num -> Num)
Parameters:
x: The number to be rounded.
Returns:
The nearest integer value of x.
Example:
>> 3.5:rint()
= 4
>> 2.5:rint()
= 2
round
Description: Rounds a number to the nearest whole number integer.
Signature:
func round(x: Num -> Num)
Parameters:
x: The number to be rounded.
Returns:
The nearest integer value of x.
Example:
>> 2.3:round()
= 2
>> 2.7:round()
= 3
scientific
Description: Formats a number in scientific notation with a specified precision.
Signature:
func scientific(n: Num, precision: Int = 0 -> Text)
Parameters:
n: The number to be formatted.precision: The number of decimal places. Default is0.
Returns: A string representation of the number in scientific notation with the specified precision.
Example:
>> 12345.6789:scientific(precision=2)
= "1.23e+04"
significand
Description: Extracts the significand (or mantissa) of a number.
Signature:
func significand(x: Num -> Num)
Parameters:
x: The number from which to extract the significand.
Returns:
The significand of x.
Example:
>> 1234.567:significand()
= 0.1234567
sin
Description: Computes the sine of a number (angle in radians).
Signature:
func sin(x: Num -> Num)
Parameters:
x: The angle in radians.
Returns:
The sine of x.
Example:
>> 0.0:sin()
= 0
sinh
Description: Computes the hyperbolic sine of a number.
Signature:
func sinh(x: Num -> Num)
Parameters:
x: The number for which the hyperbolic sine is to be calculated.
Returns:
The hyperbolic sine of x.
Example:
>> 0.0:sinh()
= 0
sqrt
Description: Computes the square root of a number.
Signature:
func sqrt(x: Num -> Num)
Parameters:
x: The number for which the square root is to be calculated.
Returns:
The square root of x.
Example:
>> 16.0:sqrt()
= 4
tan
Description: Computes the tangent of a number (angle in radians).
Signature:
func tan(x: Num -> Num)
Parameters:
x: The angle in radians.
Returns:
The tangent of x.
Example:
>> 0.0:tan()
= 0
tanh
Description: Computes the hyperbolic tangent of a number.
Signature:
func tanh(x: Num -> Num)
Parameters:
x: The number for which the hyperbolic tangent is to be calculated.
Returns:
The hyperbolic tangent of x.
Example:
>> 0.0:tanh()
= 0
tgamma
Description: Computes the gamma function of a number.
Signature:
func tgamma(x: Num -> Num)
Parameters:
x: The number for which the gamma function is to be calculated.
Returns:
The gamma function of x.
Example:
>> 1.0:tgamma()
= 1
trunc
Description: Truncates a number to the nearest integer towards zero.
Signature:
func trunc(x: Num -> Num)
Parameters:
x: The number to be truncated.
Returns:
The integer part of x towards zero.
Example:
>> 3.7:trunc()
= 3
>> (-3.7):trunc()
= -3
y0
Description: Computes the Bessel function of the second kind of order 0.
Signature:
func y0(x: Num -> Num)
Parameters:
x: The number for which the Bessel function is to be calculated.
Returns:
The Bessel function of the second kind of order 0 of x.
Example:
>> 1.0:y0()
= -0.7652
y1
Description: Computes the Bessel function of the second kind of order 1.
Signature:
func y1(x: Num -> Num)
Parameters:
x: The number for which the Bessel function is to be calculated.
Returns:
The Bessel function of the second kind of order 1 of x.
Example:
>> 1.0:y1()
= 0.4401
clamped
Description:
Returns the given number clamped between two values so that it is within
that range.
Signature:
clamped(x, low, high: Num -> Num)
Parameters:
x: The number to clamp.low: The lowest value the result can take.high: The highest value the result can take.
Returns:
The first argument clamped between the other two arguments.
Example:
>> 2.5:clamped(5.5, 10.5)
= 5.5