Discounting
Discounting
Discounting contract without a state which defines the relevant formulas for the navfeed
calcDiscount
function calcDiscount(uint256 discountRate, uint256 fv, uint256 normalizedBlockTimestamp, uint256 maturityDate) internal pure returns (uint256 result)
calculates the discount for a given loan
Parameters
| Name | Type | Description |
|---|---|---|
| discountRate | uint256 | the discount rate |
| fv | uint256 | the future value of the loan |
| normalizedBlockTimestamp | uint256 | the normalized block time (each day to midnight) |
| maturityDate | uint256 | the maturity date of the loan |
Return Values
| Name | Type | Description |
|---|---|---|
| result | uint256 | discount for the loan |
calcFutureValue
function calcFutureValue(uint256 loanInterestRate, uint256 amount, uint256 maturityDate, uint256 recoveryRatePD) internal view returns (uint256 fv)
calculate the future value based on the amount, maturityDate interestRate and recoveryRate
Parameters
| Name | Type | Description |
|---|---|---|
| loanInterestRate | uint256 | the interest rate of the loan |
| amount | uint256 | of the loan (principal) |
| maturityDate | uint256 | the maturity date of the loan |
| recoveryRatePD | uint256 | the recovery rate together with the probability of default of the loan |
Return Values
| Name | Type | Description |
|---|---|---|
| fv | uint256 | future value of the loan |
secureSub
function secureSub(uint256 x, uint256 y) internal pure returns (uint256 result)
substracts to values if the result smaller than 0 it returns 0
Parameters
| Name | Type | Description |
|---|---|---|
| x | uint256 | the first value (minuend) |
| y | uint256 | the second value (subtrahend) |
Return Values
| Name | Type | Description |
|---|---|---|
| result | uint256 | result of the subtraction |
uniqueDayTimestamp
function uniqueDayTimestamp(uint256 timestamp) internal pure returns (uint256 nTimestamp)
normalizes a timestamp to round down to the nearest midnight (UTC)
Parameters
| Name | Type | Description |
|---|---|---|
| timestamp | uint256 | the timestamp which should be normalized |
Return Values
| Name | Type | Description |
|---|---|---|
| nTimestamp | uint256 | normalized timestamp |
rpow
function rpow(uint256 x, uint256 n, uint256 base) internal pure returns (uint256 z)
rpow peforms a math pow operation with fixed point number adopted from ds-math
Parameters
| Name | Type | Description |
|---|---|---|
| x | uint256 | the base for the pow operation |
| n | uint256 | the exponent for the pow operation |
| base | uint256 | the base of the fixed point number |
Return Values
| Name | Type | Description |
|---|---|---|
| z | uint256 | the result of the pow operation |