Column in datatable with dynamic function paramater

[Atiroocky]

Hello,

I managed to calculate a cumulative rolling day in a column of my table.

I use the function "DATESINPERIOD"

I would like to replace the "static" number parameter by a dynamic parameter

I know that datatable are kind of "static" and can’t be updated with a "what-if" paramater.
By the past I managed to generate a dynamic datable thanks to "SWITCH" function, but it was totally different needs and I can’t apply this "trick" to my actual need.

Any help would be appreciated !

Thanks

[tamerj1 · Accepted solution]

Hi @Atiroocky 
Calculated columns cannot be dynamic as they do not interact with the fiter conext of the report. This has to be a measure

Count =
CALCULATE (
    SUM ( 'Table_DHU'[CityLocation] ),
    ALL ( 'Table_DHU' ),
    DATESINPERIOD (
        'Table_DHU'[Date],
        MAX ( 'Table_DHU'[Date] ),
        - [Parameter],
        DAY
    )
)

[Atiroocky]

Thanks, that works perfectly !

As a "beginner" I’m not very comfortable playing with "Measures". A bit earlier before posting in this forum, I tried to put the column code in a measure, but I used Table_DHU[Date] as start date instead of "MAX(Table_DHU[Date])". I was returning me an error.
For me "MAX" was the last entry of all table data. But I was thinking as "table" data and no "measure" data. It is still a bit confused in my mind but time will help.

Thanks again !

[tamerj1]

@Atiroocky 
MAX ( 'Table'[Column] ) when used in a calculated column returns the max value in this column becuase there is no filter context. However when used in a measure it will return the max value avialable in the current filter context. In other words, the value is different from one row to another.

[Atiroocky]

Thanks for your explanation. That helps me better understanding.