Sweeping of variable with step as expression

Hi all, 

I wanted to sweep a parameter as follows in ADE XL, "vin" should be swept between [initInput,endInput] with steps of (endInput-initInput)/amountPoints (with amountPoints, initInput and endInput as global variables). Or in other words, I want to get something like this in the field of "vin" in ADE XL: initInput:(endInput-initInput)/amountPoints:endInput. However, if I am inserting this as value for the variable "vin" I am getting a error that it is not a valid range.

Thanks!

Kind regards, 

Nicolas