github.com/jingcheng-WU/gonum@v0.9.1-0.20210323123734-f1a2a11a8f7b/unit/constant/electricconstant.go (about)

     1  // Code generated by "go generate github.com/jingcheng-WU/gonum/unit/constant”; DO NOT EDIT.
     2  
     3  // Copyright ©2019 The Gonum Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  package constant
     8  
     9  import (
    10  	"fmt"
    11  
    12  	"github.com/jingcheng-WU/gonum/unit"
    13  )
    14  
    15  // ElectricConstant is the electric constant (ε₀), the value of the absolute dielectric permittivity of classical vacuum.
    16  // The dimensions of ElectricConstant are A^2 s^4 kg^-1 m^-3. The standard uncertainty of the constant is 1.3e-21 A^2 s^4 kg^-1 m^-3.
    17  const ElectricConstant = electricConstantUnits(8.854187817620389e-12)
    18  
    19  type electricConstantUnits float64
    20  
    21  // Unit converts the electricConstantUnits to a *unit.Unit
    22  func (cnst electricConstantUnits) Unit() *unit.Unit {
    23  	return unit.New(float64(cnst), unit.Dimensions{
    24  		unit.CurrentDim: 2,
    25  		unit.TimeDim:    4,
    26  		unit.MassDim:    -1,
    27  		unit.LengthDim:  -3,
    28  	})
    29  }
    30  
    31  func (cnst electricConstantUnits) Format(fs fmt.State, c rune) {
    32  	switch c {
    33  	case 'v':
    34  		if fs.Flag('#') {
    35  			fmt.Fprintf(fs, "%T(%v)", cnst, float64(cnst))
    36  			return
    37  		}
    38  		fallthrough
    39  	case 'e', 'E', 'f', 'F', 'g', 'G':
    40  		p, pOk := fs.Precision()
    41  		w, wOk := fs.Width()
    42  		switch {
    43  		case pOk && wOk:
    44  			fmt.Fprintf(fs, "%*.*"+string(c), w, p, cnst.Unit())
    45  		case pOk:
    46  			fmt.Fprintf(fs, "%.*"+string(c), p, cnst.Unit())
    47  		case wOk:
    48  			fmt.Fprintf(fs, "%*"+string(c), w, cnst.Unit())
    49  		default:
    50  			fmt.Fprintf(fs, "%"+string(c), cnst.Unit())
    51  		}
    52  	default:
    53  		fmt.Fprintf(fs, "%%!"+string(c)+"(constant.electricConstantUnits=%v A^2 s^4 kg^-1 m^-3)", float64(cnst))
    54  	}
    55  }