Class function with variable

[#1]

I am trying to use the class funtion to count the number of purchases in different brackets. I have written the following in the calculated dimension

=class(PurchaseValue,vWidth,'Purchase Size')

The problem i have is that i just can't take the purchase value direct from the data source as i need to exclude a few entries to get the correct number. To do this i have written the below variable

vpurchase = Reregistration={No},Switch={No}

This variable works but i am stuck as to how i encorporate the variable into the class function.

I have tried the below but it doesn't work can someone help?

=class((vpurchase)PurchaseValue,vWidth,'Purchase Size')

[johnw]

I think this?

=class(aggr(only({<Reregistration={'No'},Switch={'No'}>} PurchaseValue),PurchaseValue),vWidth,'Purchase Size')

Or if you really want to use your variable, probably this?

=class(aggr(only({<$(vpurchase)>} PurchaseValue),PurchaseValue),vWidth,'Purchase Size')

[johnw]

Though it might be easier, and would likely run faster, if you create a "No Reregistration No Switch Purchase Value" field, whatever you want to call it.

if(Reregestration='No' and Switch='No',PurchaseValue) as "No Reregistration No Switch Purchase Value"

=class("No Reregistration No Switch Purchase Value",vWidth,'Purchase Size')