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32 lines
520 B
Go
32 lines
520 B
Go
2 years ago
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package utils
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import (
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"fmt"
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"gitee.ltd/lxh/logger"
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"math"
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"strconv"
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)
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type mathUtil struct{}
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func MathUtil() *mathUtil {
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return &mathUtil{}
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}
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func (m mathUtil) Sqrt(datas []float64, avg float64) float64 {
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if len(datas) == 0 {
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return 0
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}
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var aaa float64
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for _, d := range datas {
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co := d - avg
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aaa += co * co
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}
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d, err := strconv.ParseFloat(fmt.Sprintf("%.2f", math.Sqrt(aaa/float64(len(datas)))), 64)
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if err != nil {
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logger.Say.Errorf("生成标准差失败：%v", err)
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return 0
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}
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return d
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}
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