Crystal Formula

Hi,

I am trying to make the following formula work. I guess, I am looking for a sub query. I have tried the following..

local numbervar CntInformedRes;
CntInformedRes :=
if date({Archive_tblEvents.TableDate}) = today
and {Archive_tblEvents.SubStatusGroup} = "Accepted - Informed Reserve"
then 1 else 0;

local numbervar SumInformedRes;
SumInformedRes :=
if date({Archive_tblEvents.TableDate}) = today
and {Archive_tblEvents.SubStatusGroup} = "Accepted - Informed Reserve"
then {Archive_tblEvents.OutstandingReserves} else 0;

Sum(SumInformedRes) / Sum(CntInformedRes)



This doesn't work, it wants a field. It doesn't accept the variables assigned.
And..

Sum(
if date({Archive_tblEvents.TableDate}) = today
and {Archive_tblEvents.SubStatusGroup} = "Accepted - Informed Reserve"
then 1 else 0
)

/

Sum(
if date({Archive_tblEvents.TableDate}) = today
and {Archive_tblEvents.SubStatusGroup} = "Accepted - Informed Reserve"
then {Archive_tblEvents.OutstandingReserves} else 0
)

but with this it wants fields.

I think it is fairly clear what I am trying to achieve, and I bet the answer is simple.

Thanks
BananaFuryAsked:
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mlmccConnect With a Mentor Commented:
You might be able to do it with running totals but it would take one for formula 1 and one for formula 2.

The problem is you are filtering the records based on data in them to determine if the should be included in the summary.  Summary functions work on ALL records and don't have a way of limiting them.

DO you need the records, the filter is eliminating from the count and sum for the rest of the report?
If not you could eliminate them through the select expert.

mlmcc
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mlmccCommented:
Create 3 formulas
Formula 1 - CntInformedRes
if date({Archive_tblEvents.TableDate}) = today and {Archive_tblEvents.SubStatusGroup} = "Accepted - Informed Reserve" then 
    1 
else 
    0

Open in new window


Formula2 - SumInformedRes
if date({Archive_tblEvents.TableDate}) = today and {Archive_tblEvents.SubStatusGroup} = "Accepted - Informed Reserve" then
    {Archive_tblEvents.OutstandingReserves} 
else 
    0

Open in new window


Formula 3 - MySummary
Sum({@SumInformedRes}) / Sum({@CntInformedRes})

Open in new window


The problem is summary formulas are evaluated over the entire recordset but that variable only has a value for 1 record.  The formula can't be evaluated for each record except as each record is handled so all the values don't exist.

mlmcc
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BananaFuryAuthor Commented:
That's a shame.. I was aware that this could be tackled with three separate formulas, but I was really hoping it could be handled in one. Is there no other way of dealing with such formula?
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BananaFuryAuthor Commented:
Yes, I need all the records for other areas of the report. Usually I would either use a sub report for just the records required, but having subs on reports with large tables and multiple groups isn't great, or multiple formulas, which was your approach, but that means of course if a report  needs 10 Average formulas I end up with 30 formula fields, which is painful to build and maintain.
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James0628Connect With a Mentor Commented:
You might be able to do it with weighted averages.  I've never really used them myself, so I'm not sure about it, but I think they might work.

 You'd still need a "count" formula for each condition, like CntInformedRes, but they don't need to set a variable.  They just need to produce a 1 if the conditions are met, or 0 if they are not.  IOW, they'd be like the first formula in mlmcc's first post.  That's your "weight".

 Then right-click on the field to be averaged (eg. OutstandingReserves), select Insert > Summary and select "Weighted average with", and then select the count (ie. weight) formula below that.  And, of course, select the summary level (grand total or whatever).

 You could give that a try.  If it works, then you've only got one "count" formula for each condition to maintain.

 James
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BananaFuryAuthor Commented:
Thanks people. That counted weighted averages in an interesting approach. I haven't tried it so far to be honest, I just built it the way I was comfortable, but I will definitely experiment with it
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