If you just need to mark which rows need copied, one way would be to use an integer array in VBA which stores the rows that need copied. For example:

dim copyRows(1 to 100) as Integer
dim numRowsToCopy as Integer
dim rowToCopy as integer

numRowsToCopy = 0

‘***code to check if a row needs copied***
‘for this example the row is stored in rowToCopy

‘if a row needs copied, add 1 to the numRowsToCopy counter
numRowsToCopy = numRowsToCopy + 1

‘If you need to copy the row, then
‘Check if the array is big enough. If not, redim it.
if numRowsToCopy > UBound(copyRows) then Redim Preserve copyRows(1 to UBound(copyRows) + 100)

‘add the row number to your array
copyRows(numRowsToCopy) = rowToCopy

Another way would be to just use matrix multiplication via the SUMPRODUCT worksheet function and dynamic named ranges. No VBA required. Not sure if this would be much slower. Basically it would do a matrix multiply and you could store the result in another column (True or False). Then use a simple copy code to move those rows.

Personally, I like the VBA because it’s hidden and the end-user is less likely to mess it up.

I think I’ll simply have to investigate ways to more efficiently manipulate the data, and also investigate the efficiency of my algorithm.

On the other hand, have you explored using Calc from Open Office? I’m lead to believe you can script using a variety of languages such as Ruby, Python, etc.