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# Help w/ Multiply a List by Scalar then by Another List

## Help w/ Multiply a List by Scalar then by Another List

(OP)
I need assistance in trying to write the formula on the rule sheet for multiplying a list by a scalar and then be another list.
The actual formula is as follows:

Ao = [Sum(Xi * Aoi^1/2]^1/2

where:
Xi is List1
Aoi is List2

I need to take the square root of Aoi, multiply by Xi, and then and then take the quare root of the sum.
-pmover

### RE: Help w/ Multiply a List by Scalar then by Another List

One method to deal with this situation is to create a Procedure Function to perform the calculations. It would have a loop similar to the following:

call blank('@temp)
for i = 1 to length('Xi)
'@temp = 'Xi * sqrt('Aoi)
next i
Ao = sqrt(sum('@temp))
call delete('@temp)

Then list "Ao" as an Output Variable. No Input or Parameter Variables are required.

If you named the function "pfAo" your Rule Sheet would contain the rule: Ao = pfAo()

Let me know if you have any further questions regarding this procedure.

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