Forum Discussion

MrFahrenheit's avatar
MrFahrenheit
Helper I
4 years ago
Solved

Count Rows Based On Previous Row's value.

I have one column and it has 0s and 1s in it. I ONLY want to count the 0s which are followed by a 1 in the next row. For example, 0,1,0,1,0,1 would count 3 x 0s. Another example, 0,0,0,0,1 would only...
  • Fowmy's avatar
    Fowmy
    4 years ago

    MrFahrenheit 

    First, add an index column to your table in Power Query:


    Then create the following measure to calculate the count:

    Zero Count = 
    SUMX(
        Table4,
        VAR __CURRENTINDEX = Table4[Index]
        VAR __NEXTINDEX = __CURRENTINDEX + 1
        VAR __CURRENTDIGIT = Table4[Digit]        
        VAR __NEXTDIGIST = CALCULATE( MAX(Table4[Digit]) , Table4[Index] = __NEXTINDEX , REMOVEFILTERS(Table4))
        RETURN
        INT(__CURRENTDIGIT=0 && __NEXTDIGIST = 1)
    )



     



Fowmy's avatar
Fowmy
Super User
4 years ago

MrFahrenheit 

First, add an index column to your table in Power Query:


Then create the following measure to calculate the count:

Zero Count = 
    SUMX(
        Table4,
        VAR __CURRENTINDEX = Table4[Index]
        VAR __NEXTINDEX = __CURRENTINDEX + 1
        VAR __CURRENTDIGIT = Table4[Digit]        
        VAR __NEXTDIGIST = CALCULATE( MAX(Table4[Digit]) , Table4[Index] = __NEXTINDEX , REMOVEFILTERS(Table4))
        RETURN
        INT(__CURRENTDIGIT=0 && __NEXTDIGIST = 1)
    )



 



MrFahrenheit's avatar
MrFahrenheit
Helper I
4 years ago

Thank you for your solution! I tested your suggestion by creating a smaller spreadsheet with only 50 items and manually counted how many "zeros" were followed in the next row by numbers greater than "zero". When I applied your measure/index idea, it came out to the right number!! I modified your code slightly to use "> 0" instead of "+ 1" in this part of the code (see example below) to count all "zeros" followed by any number greater than "zero": 

INT(__CURRENTDIGIT=0 && __NEXTDIGIST = 1)