Create measure to calculate % change from distinct values in a column - powerbi

Question

Situation:
I have a column in my table with values representing weeks of the year.
Each week number has their respective total counts of purchases on another column. When I use a matrix visual and put that specific column in the Columns section it separates them distinctively which is what I want. How can get the % change from one week to another?
Table looks like this:
Objective:
Create a measure that can divides column 2 by column 1 to get the % change.
Layout of Matrix:
Ideally I would like to have a third column to calculate the values in column 6 by the ones in column 5.

Answer 1

OK, here is one solution:
Delta :=
VAR Week5 =
CALCULATE ( SUM ( 'Table'[Total] ), FILTER ( 'Table', 'Table'[Weeks] = 5 ) )
VAR Week6 =
CALCULATE ( SUM ( 'Table'[Total] ), FILTER ( 'Table', 'Table'[Weeks] = 6 ) )
RETURN
IF (
SUM ( 'Table'[Total] ) = SUMX ( ALL ( 'Table' ), 'Table'[Total] )
|| SUM ( 'Table'[Total] )
= SUMX (
FILTER ( ALL ( 'Table' ), 'Table'[Cohort] = MAX ( 'Table'[Cohort] ) ),
'Table'[Total]
),
100*DIVIDE ( Week6 - Week5, Week5 ),
BLANK ()
)
I tested it and it works:
BUT because the way your data is structured, it makes it very difficult (for me) to make this pretty. But hey, it works!! ;) I wasn't sure which direction you needed the delta but that is a simple change in the measure from this:
100*DIVIDE ( Week6 - Week5, Week5 )
To this:
100*DIVIDE ( Week5 - Week6, Week6 )
Hope this help!