CreateAmortObj





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Creates an amortisation object to be used within the amortisation fixed and floating rate leg objects.

You can choose between these various methods for the different amortisation calculation (refer to the function in brackets for details of how the amortisation function is computed) : 'Linear' [ AmortiseLinear2() ], 'Amortise' [ Amortise() ], 'SLN' [ AmortiseSLN() ], 'SYD' [ AmortiseSYD() ], 'DB' [ AmortiseDB() ], 'DDBExact' [ AmortiseDDBExact() ] and 'GDB' [ AmortiseGeneralDB() ]. This function requires the input of a Schedule object key, which must have been produced via a call to one of the following functions : MakeSchedule() or MakeSchedule2(). These functions would have returned a string 'KEY' which is to be passed to the 'ScheduleKey' parameter of this function.



This function creates an object and returns a string-key value to represent this created object.
The TAG value of the string-key returned (second part of the key) is : "AMORT"



Note: Within Excel, the function is named - CT.UTIL.CreateAmortObj




High level graphic of CreateAmortObj() function with parameters. Blue square node is the actual function with the parameters ordered.



Parameter Description


  1. Key parameter

    Key value to use as a handle for the created object
  2. Reload parameter

    When creating this object for the first time, set this parameter to a positive value. Within Excel, when re-computing a worksheet where you do not wish to recreate the object, set this parameter to zero (0).
  3. Notional parameter

    Initial positive notional amount. Must be a single value. Amortisation function will control the generation of notional for following cash flows.
  4. FinalNot parameter

    Final positive notional amount. Enter a value of zero (0) if you wish to amortise to zero except for the cases where the AmortMethod is either 'DB' or 'DDBExact'. You cannot specify an ending Notional of zero in these latter two amortisation methods.
  5. PrincipalPayments parameter

    Whether you wish to include principal payments that are paid to the holder of this contract during the life of the leg contract. In the case of amortised legs, this should generally be set to true.
  6. AmortMethod parameter

    Amortisation method to use. You can choose one of the following : 'Linear', 'Amortise', 'SLN', 'SYD', 'DB', 'DDBExact' or 'GDB'.
  7. AmortRate parameter

    Amortisation rate to use. Needed by the 'Linear', 'Amortise' and 'GDB' amortisation methods (indicated by the AmortMethod parameter). This is an annual rate in decimal notation.
  8. AmortRepeatNot parameter

    The number of times you would like to repeat the Notional amounts computed (normally 1).
  9. ScheduleKey parameter

    Schedule Key to an already generated schedule object.


Extended information

Function Syntax

VB Syntax


String CTUtils.CreateAmortObj( _
String Key, _
Long Reload, _
Double Notional, _
Double FinalNot, _
Boolean PrincipalPayments, _
AmortEnum AmortMethod, _
Double AmortRate, _
Long AmortRepeatNot, _
String ScheduleKey)


Excel Spreadsheet Syntax


=CT.UTIL.CreateAmortObj(
Excel String Cell Key,
Excel Numeric Cell Reload,
Excel Numeric Cell Notional,
Excel Numeric Cell FinalNot,
Excel Boolean Value Cell PrincipalPayments,
Excel String Cell AmortMethod,
Excel Numeric Cell AmortRate,
Excel Numeric Cell AmortRepeatNot,
Excel String Cell ScheduleKey)


C++ Syntax


static std::string CreateAmortObj(
std::string Key,
long Reload,
double Notional,
double FinalNot,
bool PrincipalPayments,
AmortEnum AmortMethod,
double AmortRate,
long AmortRepeatNot,
std::string ScheduleKey);


DotNET Syntax


System.String CTUtilsSA.CreateAmortObj(
System.String Key,
System.Int32 Reload,
System.Double Notional,
System.Double FinalNot,
System.Boolean PrincipalPayments,
CTIEnums.AmortEnum AmortMethod,
System.Double AmortRate,
System.Int32 AmortRepeatNot,
System.String ScheduleKey);

Parameter data types

ArgNameArgTypeIsKey
KeyStringFALSE
ReloadLongFALSE
NotionalDoubleFALSE
FinalNotDoubleFALSE
PrincipalPaymentsBooleanFALSE
AmortMethodAmortEnumFALSE
AmortRateDoubleFALSE
AmortRepeatNotLongFALSE
ScheduleKeyStringTRUE


Example Inputs

The first column represents the name of the parameters. The second column specifies whether the parameters are optional or not. Finally the last column provides some sample input data.
Function call input string-keys are always in the format : "NAME.EXTTAG.TICKER" The "EXTTAG.TICKER" part is determined from the output of other, capetools, object creation functions.


ArgNameIsOptional (Excel only)Example
KeyFALSEMyCreateAmortObj
ReloadFALSE1
NotionalFALSE5000000
FinalNotFALSE1000000
PrincipalPaymentsFALSEtrue
AmortMethodFALSELINEAR
AmortRateTRUE0.06
AmortRepeatNotFALSE1
ScheduleKeyFALSEScheduleKeyNAME.EXTTAG.TICKER (from a function call)


Example function usage


The C# example below contains all the sub-function calls leading up to this function call. As a result, the example can contain a lot of code.

The VB.NET, J#, C++.NET, Java, Excel VBA, Visual Basic 6 (via COM) and C++ examples below contain function code stubs for the calls leading up to this function call. However, the function call for this function is displayed.
You can easily reproduce the stub functions code from the C# example.


If you are accessing this functrion via the MiniXL libraries, this function is present within the CT.QL.Utils20 MiniXL Excel Addin.

Within our Excel Example Addin Generator, we have used the following QuantTools sub-functions in order to prepare the arguments needed to call the CreateAmortObj() function. If you are executing this function via the MiniXL libraries, the module addin name, (in brackets, to the right of the sub-functions listed below), indicates the MiniXL library in which the sub-function is held. You will need to load this library into your Excel session (along with any other libraries that the sub-function call within the addin requires (ie - CT.QT.Utils20 addin in almost all cases) in order for the example to compute successfully.

These are the financial QuantTools sub-function calls that are used within the examples :





The objects generated by these sub-functions are inter-connected in the following way :




The following four examples demostrate calling this function within a Microsoft .NET environment

The following four examples demostrate calling this function within a non .NET environment

The following is a sample output from executing the CreateAmortObj() function call


MyCreateAmortObj_44.AMORT.0

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