Crystal Reports - Formula - Sum field based on field value

I need to programmatically calculate a grand total.  I have a PostTax field which contains either a 1 or 0.  I also have an amount field.

So, if the PostTax field contains a 1 I need to sum all values and it can result in a negative value so I need to default it to 0 if that happens.

Then I need to add the above result to the sum of amount where PostTax = 0.

I'm trying to write this in a formula.  This is in a subform and the only purpose is to return the grandtotal.

Any ideas?
Mike McCracken

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Ah, I did taht but didnn't do the summary.  I actually did something like this

Don't have exact code but it's somehting like this

Dim PostTaxAmt as double
Dim PreTaxAmt as double
Dim GrandTotal as double

if postax = 1 Then
PostTaxAmt = PostTaxAmt + Amount
End If

if pretax = 0 Then
PreTaxAmt = PreTaxAmt + Amount
End If

If posttaxamt < 0 then
posttaxamt = 0
end if

If pretaxamt < 0 then
pretaxamt = 0
end if

grandtotal = postaxamt + retaxamt
Mike McCracken

That should work.

How did you display them?

mlmcc
I see some problems with your formula, but some of it may just be something that was lost in translation, since that's not your actual formula.  But I do see one basic problem with what you seem to be doing.

The formula is presumably being evaluated for each record (and Amount is a field in the record).  When you check your posttaxamt and pretaxamt totals to see if they're negative, you're looking at the total as of that record.  The problem with that is that if a total -- at that point -- is negative, you reset it to 0, which then throws off the total from that point on.  Say you had records with 5, 10, 15, -50, 20.  If you add all of those together, you get 0.  But with a formula like the one that you posted, the total will be 30 on the 3rd record, and then -20 on the 4th, which the formula will change to 0.  Then it adds 20 for the last record, and you get a total of 20, instead of 0.

Presumably you don't want to check for a negative total until you have the final total (ie. after the last record has been read).

Then again, without seeing your actual formula, and knowing where you're using it, and knowing about anything else that might be manipulating your variables, this is just guesswork.

James

Here is the formula.  I'm using Basic Code.

``````dim posttax as double
dim pretax as double

IF {PayrollDeduction.postTax} = true Then
IF SUM({PayrollDeduction.amount}) < 0 Then
posttax = 0
ELSE
posttax = SUM({PayrollDeduction.amount})
END IF
END IF

IF {PayrollDeduction.postTax} = false Then
IF SUM({PayrollDeduction.amount}) < 0 Then
pretax = 0
ELSE
pretax = SUM({PayrollDeduction.amount})
END IF
END IF

formula = posttax + pretax``````

Above code is wrong.  This is what I have.

``````dim posttax as double
dim pretax as double
dim grandtotal
IF {PayrollDeduction.postTax} = true Then
posttax = posttax + ToNumber(PayrollDeduction.amount)
END IF

IF {PayrollDeduction.postTax} = false Then
posttax = posttax + ToNumber(PayrollDeduction.amount)
END IF

IF pretax < 0 THEN
pretax = 0
END IF

IF posttax < 0 THEN
posttax = 0
END IF

GrandTotal = posttax + pretax``````
The question is, when do you care that the total is negative?
The order of the data should NOT affect the result unless you can control the order.

As you have your code, every time that formula runs it checks if the result of the intermediate sums is < 0, is that what you want or do you want to add ALL the pretax values then test for < 0

Where in the report is this formula?

mlmcc