Go languagemathThe module provides a wealth of mathematical functions and constants, covering basic operations, trigonometric functions, exponents, logarithms, rounding, special values, etc. The following are core methods and examples:
1. Basic mathematical operations
Take the absolute value (onlyfloat64）。
((-3.5)) // Output: 3.5((4)) // mistake! Required (4.0)
and
-
Mod: Take the remainder (the symbol is the same as the divisor). -
Remainder: IEEE 754 Standard remainder (the symbol is the same as the dividend).
((10, 3)) // Output: 1((10, 3)) // Output: 1((-10, 3)) // Output: -1((-10, 3)) // Output: -1
and
Cube root and square root.
((16)) // Output: 4((27)) // Output: 3
2. Trigonometric function
All function parameters are radians (non-angle).
、、
rad := / 2 ((rad)) // Output: 1 (approximate value)((rad)) // Output: 6.123e-17 (close to 0)
、、
Inverse trigonometric function (returns to radians).
((1)) // Output: 1.5708 (π/2)
3. Index and Logarithm
and
Natural index and logarithm.
((2)) // Output: ~7.389 (e²)((7.389)) // Output: ~2
and math.Pow10
Power operation.
((2, 3)) // Output: 8(math.Pow10(3)) // Output: 1000
math.Log10 and math.Log2
Logarithm with base 10 or 2.
(math.Log10(1000)) // Output: 3(math.Log2(8)) // Output: 3
4. Rounding and Cutoff
and
Round up and down.
((3.2)) // Output: 4((3.9)) // Output: 3
Directly cut off the decimal part.
((3.9)) // Output: 3
and
rounding(RoundToEvenRound to the nearest even number).
((2.5)) // Output: 3((2.5)) // Output: 2
5. Maximum and Minimum Values
and
Return twofloat64The maximum or minimum value of the value.
((3, 5)) // Output: 5((3, 5)) // Output: 3
6. Special value processing
and
Check whether it is non-numeric or infinity.
val := (-1) // Generate NaN((val)) // Output: true((1/(1), 0)) // Check if it is infinite
and
Generates infinity or non-numeric values.
posInf := (1) // It's endlessnegInf := (-1) // Negative Infinitynan := ()
7. Special functions
Calculate the bevel length of a right triangle.
((3, 4)) // Output: 5
and
Gamma function and error function.
((5)) // Output: 24 (4!)((1)) // Output: ~0.8427
8. Mathematical Constants
Commonly used constants
() // Output: 3.141592653589793() // Output: 2.718281828459045() // Output: 1.618033988749895 (Golden Partition)
Summarize
-
Core functions：
-
Basic operations：
Abs,Mod,Sqrt,Pow -
Trigonometric function：
Sin,Cos,Asin -
Exponent logarithm：
Exp,Log,Log10 -
Rounding processing：
Ceil,Floor,Round -
Special value：
NaN,Inf,IsNaN -
constant：
Pi,E
-
Basic operations：
-
Things to note：
- All function operations
float64Type (other types need to be explicitly converted). - The trigonometric function parameter is radian (the angle needs to be converted to radians:
rad = degrees * π / 180）。 - Handle special values (such as
NaN) is requiredJudgment cannot be compared directly.
- All function operations
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