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## sum of products (row by column)

Hi all,
I am having difficulty performing a sum of products (row by column).
I need to find for each Product (title)a value and insert it in a collection to be used later; I give an example to make clear what I would like to achieve :

PRODUCTS COLLECTION :

 PERC TITLE 23.32 A 19.38 B 3.1 C 4.84 D

PHASE COLLECTION

 PHASES A B C D start 0 5 3 3.2 create 1.5 2.1 0 2 activate 2.1 2 1 2.2 end 2 1 1.2 1.6

The result I would like to obtain is a collection (or column) that containing the sum of the multiplications of the products column with each row of phases.

Ex. : start distribution = 0*23.32+5*19.38+3*3.1+3.2*4.84
create distribution = 1.5*23.32+2.1*19.38+0*3.1+2*4.84
active distribution = 2.1*23.32+2*19.38+1*3.1+2.2*4.84
end distribution = 2*23.32+1*19.38+1.2*3.1+1.6*4.84

I have been trying to find a solution for 3 days without success.
I ask for help from you power apps masters.
Tks

2 REPLIES 2
Super User

In Power Apps, you can achieve the sum of products (row by column) as described using a combination of functions. Here's a step-by-step guide on how to do it:

1. Create a new collection to store the results. Let's call it "ResultCollection."

``ClearCollect(ResultCollection, { Title: "Start" }, { Title: "Create" }, { Title: "Activate" }, { Title: "End" })``

2. Use the ForAll function to iterate through each row of the "ResultCollection" and calculate the sum of products for each Title.

``````ForAll(ResultCollection,

Patch(ResultCollection, Defaults(ResultCollection),

{

Title: ThisRecord.Title,

Distribution: Sum(PhaseCollection[@[ThisRecord.Title]]) * LookUp(ProductsCollection, TITLE = ThisRecord.Title).PERC

}

))``````

In this code:

- We use the ForAll function to loop through each record in "ResultCollection."

- For each record, we calculate the sum of products by using the Sum function to add up the products of each corresponding row in "PhaseCollection" and the matching "PERC" value from "ProductsCollection."

- The Patch function updates the "ResultCollection" with the calculated "Distribution" for each record.

After running this code, the "ResultCollection" will contain the desired results, where each record represents a Title and its corresponding distribution.

You can then use the "ResultCollection" in your Power App as needed for further operations.

Got this solution from AI. See if this works for you

Frequent Visitor

Hi Ahmad,
first of all, thank you for your response.
I have some problems with your code, especially on :

Distribution: Sum(PhaseCollection[@[ThisRecord.Title]]) * LookUp(ProductsCollection, TITLE = ThisRecord.Title).PERC

power apps does not accept [@[ThisRecord.Title]] but only [@Title]
If I enter its suggestion, it returns 3 errors :
1. Lacolumn Distribution does not exist
2. Patch function has invalid arguments
3. The Sum function has invalid arguments.

To be honest, I don't really understand how the @ works; that's why I have a lot of difficulties.
Thanks again
Bye
Antonio

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