I have found a module which starts as follows:-
------------------------------------------------------------------------------

' This module contains routines for cubic spline interpolation and
integration.

' Designed for Microsoft Excel 97 and beyond

' Written 1999/6/30, David J. Braden

' Revisions:

' 1999/7/2 DJB Made 2nd derivative at upper endpoint exact

' Tightened up input validation code

' 1999/7/6 DJB Streamlined (optional) error-checking

' About 20% of the code is for checking that input is valid, hence the length.

' If you "know" that input is always valid, set the compiler directive

' fValidateInput = True.
--------------------------------------------------------------------------
etc. etc

what exactly do I need to do to add this module which contains functions and
subroutines to an excel workbook 2003

Did you try copy and paste into a VBA module?

"Bob Mat" wrote:

I have found a module which starts as follows:-
------------------------------------------------------------------------------

' This module contains routines for cubic spline interpolation and
integration.

' Designed for Microsoft Excel 97 and beyond

' Written 1999/6/30, David J. Braden

' Revisions:

' 1999/7/2 DJB Made 2nd derivative at upper endpoint exact

' Tightened up input validation code

' 1999/7/6 DJB Streamlined (optional) error-checking

' About 20% of the code is for checking that input is valid, hence the length.

' If you "know" that input is always valid, set the compiler directive

' fValidateInput = True.
--------------------------------------------------------------------------
etc. etc

what exactly do I need to do to add this module which contains functions and
subroutines to an excel workbook 2003

yes

"JLGWhiz" wrote:

Did you try copy and paste into a VBA module?

"Bob Mat" wrote:

I have found a module which starts as follows:-
------------------------------------------------------------------------------

' This module contains routines for cubic spline interpolation and
integration.

' Designed for Microsoft Excel 97 and beyond

' Written 1999/6/30, David J. Braden

' Revisions:

' 1999/7/2 DJB Made 2nd derivative at upper endpoint exact

' Tightened up input validation code

' 1999/7/6 DJB Streamlined (optional) error-checking

' About 20% of the code is for checking that input is valid, hence the length.

' If you "know" that input is always valid, set the compiler directive

' fValidateInput = True.
--------------------------------------------------------------------------
etc. etc

what exactly do I need to do to add this module which contains functions and
subroutines to an excel workbook 2003