Forum Discussion

Anonymous's avatar
Anonymous
Not applicable
6 years ago
Solved

Dax Help

Hi, I am trying to calculate the below excel formula in Power BI as a calculated column (DAX or MQuery or Python)   Formula: IDA = ((1 + (Current value of PX_LAST/10000)) * Next IDA value)   Sam...
Need Help
  • lbendlin's avatar
    lbendlin
    6 years ago

    Well, never say never.

     

    Behold:

     

    IDA_m = 1+max('Table'[PX_Last])/10000

IDA_p = 
var d=max('Table'[As of Date])
return 10000000*PRODUCTX(filter(all('Table'),'Table'[As of Date]<=d),[IDA_m])
lbendlin's avatar
lbendlin
Super User
6 years ago

"by "Previous" I mean the value from previous day (same as previous row if placed in descending order by Date)"

 

You see, this is exactly where my confusion comes from. I would call that the NEXT row. The previous row is on top of the current row, and the next row is below it - at least in my cultural perception. (I also wouldn't put dates in descending order but that's probably just me)

 

Here is how I would start:

 

var d = max('Table'[As of Date])

var prev_d = calculate (max('Table'[As of Date]),ALL('Table'),'Table'[As of Date]<d)

 

That gives you the latest date before your filter context date.

 

And now it becomes really complex since your measure depends on itself. Most likely this will lead to some sort of circular reference.

 

Where does the starting value come from? is that the 10 mil under the July line?

 

 

Anonymous's avatar
Anonymous
Not applicable
6 years ago

lbendlin thanks for your input and yes you are right. That would be the next row. Dint realise we could see the same thing from either way, my bad. 

 

Yeah the complex part would be tackling the circular reference. 

 

The starting value (10 mil) was just entered manually in the spread sheet to start the base calculation. The first value will have to refer to this 10 mil in the calculation. 

 

Thanks,

SV