cudpp radixsort how to sort in descending order

The default for cudpp radixsort is in ascending order. How to config it so that it will sort in descending order?

Also, what is the difference between the cudpp radixsort and the RadixSort example from the CUDA SDK?

Thank you,

The default for cudpp radixsort is in ascending order. How to config it so that it will sort in descending order?

Also, what is the difference between the cudpp radixsort and the RadixSort example from the CUDA SDK?

Thank you,