EvaluateFunction




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Evaluates a custom function.

This function's main use is in verifying that the expression is generating the correct output (A debugging tool if you like).

The function to be evaluated must have been previously created via the CustomFunction() function.

This CustomFunction() would have returned a string 'KEY' which is to be passed to the 'FuncKey' parameter of this function.



Note: Within Excel, the function is named - CT.FUNC.EvaluateFunction


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



Parameter Description


  1. FuncKey parameter

    Key value an already created CustomFunction object.
  2. XValue parameter

    The point where you would like to evaluate the function.


Extended information

Function Syntax

VB Syntax 


Double CTUtils.EvaluateFunction( _
String FuncKey, _
Double XValue)


Excel Spreadsheet Syntax 


=CT.FUNC.EvaluateFunction(
Excel String Cell FuncKey,
Excel Numeric Cell XValue)


C++ Syntax 


static double EvaluateFunction(
std::string FuncKey,
double XValue);


DotNET Syntax 


System.Double CTUtilsSA.EvaluateFunction(
System.String FuncKey,
System.Double XValue);

Parameter data types

ArgNameArgTypeIsKey
FuncKeyStringTRUE
XValueDoubleFALSE

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
FuncKeyFALSEFuncKeyNAME.EXTTAG.TICKER (from a function call)
XValueFALSE2.0


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 EvaluateFunction() 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 EvaluateFunction() function call


1.8

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