1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
package stats
import "math"
// Round a float to a specific decimal place or precision
func Round(input float64, places int) (rounded float64, err error) {
// If the float is not a number
if math.IsNaN(input) {
return math.NaN(), NaNErr
}
// Find out the actual sign and correct the input for later
sign := 1.0
if input < 0 {
sign = -1
input *= -1
}
// Use the places arg to get the amount of precision wanted
precision := math.Pow(10, float64(places))
// Find the decimal place we are looking to round
digit := input * precision
// Get the actual decimal number as a fraction to be compared
_, decimal := math.Modf(digit)
// If the decimal is less than .5 we round down otherwise up
if decimal >= 0.5 {
rounded = math.Ceil(digit)
} else {
rounded = math.Floor(digit)
}
// Finally we do the math to actually create a rounded number
return rounded / precision * sign, nil
}
|
