Golang Rat.Neg方法代码示例

func quo(x, y *complexRat) *complexRat {
	z := newComplexRat()
	denominator := new(big.Rat)
	t := new(big.Rat)
	t.Mul(y.r, y.r)
	denominator.Mul(y.i, y.i)
	denominator.Add(denominator, t)

	if denominator.Cmp(zero) == 0 {
		return newComplexRat()
	}

	ac := new(big.Rat)
	bd := new(big.Rat)
	ac.Mul(x.r, y.r)
	bd.Mul(x.i, y.i)

	bc := new(big.Rat)
	ad := new(big.Rat)
	bc.Mul(x.i, y.r)
	ad.Mul(x.r, y.i)

	z.r.Add(ac, bd)
	z.r.Quo(z.r, denominator)

	z.i.Add(bc, ad.Neg(ad))
	z.i.Quo(z.i, denominator)

	return z
}

func (r BigRat) floatString(verb byte, prec int) string {
	switch verb {
	case 'f', 'F':
		return r.Rat.FloatString(prec)
	case 'e', 'E':
		// The exponent will alway be >= 0.
		sign := ""
		var x, t big.Rat
		x.Set(r.Rat)
		if x.Sign() < 0 {
			sign = "-"
			x.Neg(&x)
		}
		t.Set(&x)
		exp := ratExponent(&x)
		ratScale(&t, exp)
		str := t.FloatString(prec + 1) // +1 because first digit might be zero.
		// Drop the decimal.
		if str[0] == '0' {
			str = str[2:]
			exp--
		} else if len(str) > 1 && str[1] == '.' {
			str = str[0:1] + str[2:]
		}
		return eFormat(verb, prec, sign, str, exp)
	case 'g', 'G':
		var x big.Rat
		x.Set(r.Rat)
		exp := ratExponent(&x)
		// Exponent could be positive or negative
		if exp < -4 || prec <= exp {
			// Use e format.
			verb -= 2 // g becomes e.
			return trimEZeros(verb, r.floatString(verb, prec-1))
		}
		// Use f format.
		// If it's got zeros right of the decimal, they count as digits in the precision.
		// If it's got digits left of the decimal, they count as digits in the precision.
		// Both are handled by adjusting prec by exp.
		str := r.floatString(verb-1, prec-exp-1) // -1 for the one digit left of the decimal.
		// Trim trailing decimals.
		point := strings.IndexByte(str, '.')
		if point > 0 {
			n := len(str)
			for str[n-1] == '0' {
				n--
			}
			str = str[:n]
			if str[n-1] == '.' {
				str = str[:n-1]
			}
		}
		return str
	default:
		Errorf("can't handle verb %c for rational", verb)
	}
	return ""
}

func unaryFloatOp(x *big.Rat, op token.Token) interface{} {
	var z big.Rat
	switch op {
	case token.ADD:
		return z.Set(x)
	case token.SUB:
		return z.Neg(x)
	}
	panic("unreachable")
}

func sexToDec(deg, min, sec *big.Rat, dir string) *big.Rat {
	// sexagesimal (base 60) to decimal
	// https://imm.dtf.wa.gov.au/helpfiles/Latitude_Longitude_conversion_hlp.htm

	deg.Add(deg, min.Quo(min, big.NewRat(60, 1)))
	deg.Add(deg, sec.Quo(sec, big.NewRat(3600, 1)))

	// N and E are the positive directions (like on an x,y axis)
	if dir == "S" || dir == "W" {
		deg.Neg(deg)
	}

	return deg
}

// Takes a transaction and balances it. This is mainly to fill in the empty part
// with the remaining balance.
func balanceTransaction(input *Transaction) error {
	balance := new(big.Rat)
	var emptyAccPtr *Account
	var emptyAccIndex int
	for accIndex, accChange := range input.AccountChanges {
		if accChange.Balance == nil {
			if emptyAccPtr != nil {
				return fmt.Errorf("More than one account change empty!")
			}
			emptyAccPtr = &accChange
			emptyAccIndex = accIndex
		} else {
			balance = balance.Add(balance, accChange.Balance)
		}
	}
	if balance.Sign() != 0 {
		if emptyAccPtr == nil {
			return fmt.Errorf("No empty account change to place extra balance!")
		}
		input.AccountChanges[emptyAccIndex].Balance = balance.Neg(balance)
	}
	return nil
}

// ratExponent returns the power of ten that x would display in scientific notation.
func ratExponent(x *big.Rat) int {
	if x.Sign() < 0 {
		x.Neg(x)
	}
	e := 0
	invert := false
	if x.Num().Cmp(x.Denom()) < 0 {
		invert = true
		x.Inv(x)
		e++
	}
	for x.Cmp(bigRatBillion) >= 0 {
		e += 9
		x.Quo(x, bigRatBillion)
	}
	for x.Cmp(bigRatTen) > 0 {
		e++
		x.Quo(x, bigRatTen)
	}
	if invert {
		return -e
	}
	return e
}

//.........这里部分代码省略.........
			}
			if security.Type == Stock && security_data.unique_id_valid != 0 && security_data.unique_id_type_valid != 0 && C.GoString(&security_data.unique_id_type[0]) == "CUSIP" {
				// Validate the security CUSIP, if possible
				if security.AlternateId != C.GoString(&security_data.unique_id[0]) {
					if iobj.Error == nil {
						iobj.Error = errors.New("OFX transaction security CUSIP failed to validate")
					}
					return 1
				}
			}
		} else {
			security, err = GetSecurity(itl.Account.SecurityId, itl.Account.UserId)
			if err != nil {
				if iobj.Error == nil {
					iobj.Error = err
				}
				return 1
			}
		}
	} else {
		// Calculate units from other available fields if its not present
		//		units = - (amount + various fees) / unitprice
		units.SetFloat64(float64(transaction_data.amount))
		fees := new(big.Rat)
		if transaction_data.fees_valid != 0 {
			fees.SetFloat64(float64(-transaction_data.fees))
		}
		if transaction_data.commission_valid != 0 {
			commission := new(big.Rat)
			commission.SetFloat64(float64(-transaction_data.commission))
			fees.Add(fees, commission)
		}
		units.Add(units, fees)
		units.Neg(units)
		if transaction_data.unitprice_valid != 0 && transaction_data.unitprice != 0 {
			unitprice := new(big.Rat)
			unitprice.SetFloat64(float64(transaction_data.unitprice))
			units.Quo(units, unitprice)
		}

		// If 'units' wasn't present, assume we're using the account's security
		security, err = GetSecurity(itl.Account.SecurityId, itl.Account.UserId)
		if err != nil {
			if iobj.Error == nil {
				iobj.Error = err
			}
			return 1
		}
	}

	split.Amount = units.FloatString(security.Precision)
	split.SecurityId = security.SecurityId
	split.AccountId = -1
	transaction.Splits = append(transaction.Splits, split)

	if transaction_data.fees_valid != 0 {
		split := new(Split)
		r := new(big.Rat)
		r.SetFloat64(float64(-transaction_data.fees))
		security, err := GetSecurity(itl.Account.SecurityId, itl.Account.UserId)
		if err != nil {
			if iobj.Error == nil {
				iobj.Error = err
			}
			return 1
		}

// Negate returns a *BigFloat that is the negative of n.
func (n *BigFloat) Negate() Numeric {
	rat := new(big.Rat)
	return (*BigFloat)(rat.Neg((*big.Rat)(n)))
}