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dirkkoch's avatar
dirkkoch
Helper III
3 years ago
Solved

Dynamically subtract two values in same column between two dates

Hi,   I have two columns (one with values, one with dates, see Screenshot marked red). I want to create a calculated column which subtracts each value with the one from the former date (see desired...
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  • MahyarTF's avatar
    MahyarTF
    3 years ago

    Hi,

    I did as below :

    1- Add the Index column to the table in Power Query.

    2- Then use below code for create the new column :

    DiffVal Col =
    Var __CurrIndex = Sheet57[Index]
    Var __CurVal = (Sheet57[Value])
    Var __BeforeVal = CALCULATE(sum(Sheet57[Value]), filter(sheet57, Sheet57[Index] = __CurrIndex - 1 ))
    return __CurVal - __BeforeVal

    Appreciate your Kudos and please mark it as solution if it helps you

MahyarTF's avatar
MahyarTF
Memorable Member
3 years ago

Hi,

I did as below :

1- Add the Index column to the table in Power Query.

2- Then use below code for create the new column :

DiffVal Col =
Var __CurrIndex = Sheet57[Index]
Var __CurVal = (Sheet57[Value])
Var __BeforeVal = CALCULATE(sum(Sheet57[Value]), filter(sheet57, Sheet57[Index] = __CurrIndex - 1 ))
return __CurVal - __BeforeVal

Appreciate your Kudos and please mark it as solution if it helps you

dirkkoch's avatar
dirkkoch
Helper III
3 years ago

MahyarTF 
Thanks! Yes, that would work if there is a value in each row of the column. Unfortunately there might be some blanks, meaning that if there is no value, it should substract the actual with the last availabe value in the column 

 

  • MahyarTF's avatar
    MahyarTF
    Memorable Member
    3 years ago

    Hi dirkkoch 

    Please try the below code in the new column I described earlier :

    DiffVal Col =
    Var __CurrIndex = Sheet57[Index]
    Var __PreviousIndex = CALCULATE(max(Sheet57[Index]), all(Sheet57), Sheet57[Index] < __CurrIndex, not(ISBLANK(Sheet57[Value])))
    Var __BeforePreviousIndex = CALCULATE(max(Sheet57[Index]), all(Sheet57), Sheet57[Index] < __PreviousIndex, not(ISBLANK(Sheet57[Value])))
    Var __PreviousVal = CALCULATE(sum(Sheet57[Value]), filter(sheet57, Sheet57[Index] = __PreviousIndex))
    Var __BeforePreviousVal = CALCULATE(sum(Sheet57[Value]), filter(sheet57, Sheet57[Index] = __BeforePreviousIndex))
    Var __NextVal = CALCULATE(sum(Sheet57[Value]), filter(sheet57, Sheet57[Index] = __CurrIndex+1))
    Var __CurVal = if(ISBLANK(Sheet57[Value]), __NextVal,Sheet57[Value])

    return if(ISBLANK(Sheet57[Value]), __PreviousVal - __BeforePreviousVal, __CurVal - __PreviousVal)

    Appreciate your Kudos and please mark it as a solution if it helps you

    • dirkkoch's avatar
      dirkkoch
      Helper III
      3 years ago

      MahyarTF  Thanks for your support! I managed to do it myself now by creating an adapted Index (with Rankx-Function) leaving out the blank spots. That worked for me!