Forum Discussion

paulj1's avatar
paulj1
Helper II
8 years ago
Solved

Grid Matrix Lookup and match

Hello, help me please, my brain hurts......

 

I have a product table, extract below, each product has a size (4.68) and a quality grade (B)

 

Trying to do a calculated column to do a lookup on the grid, rounding down 4.68 to 4.6, and looking in column B, returning the cardinal intersect value of 55.

 

This must be able to be done in Power BI, help please.

 

Thanks in advance

 

Paul

 

 

 

Need Help
  • Anonymous's avatar
    Anonymous
    8 years ago

    HI paulj1,

     

    You can enter to query editor and use unpivot columns function to transform your table as attribute and value columns.

    Power Query Unpivot Scenarios

     

     

    Then write formula to formual your area column:

    Format = 
VAR temp =
    ROUNDDOWN ( [Area], 1 )
RETURN
    IF (
        temp IN VALUES ( Grid[Size [m2]]] ),
        temp,
        MAXX ( FILTER ( ALL ( Grid ), Grid[Size [m2]]] < temp ), Grid[Size [m2]]] )
    )

     

     

    Regards,

    Xiaoxin Sheng

4 Replies

  • Anonymous's avatar
    Anonymous
    Not applicable
    8 years ago

    HI paulj1,

     

    I think lookupvalue with rounddown functions will suitable for your requirement, please take a look at below formula.

     

    Calculate column on Product table:

    Lookup =
LOOKUPVALUE ( Grid[B], Grid[Hide Size], ROUNDDOWN ( Product[area], 1 ) )

     

    Reference:

    ROUNDDOWN Function (DAX)

    LOOKUPVALUE Function (DAX)

     

    Regards,

    Xiaoxin Sheng

  • paulj1's avatar
    paulj1
    Helper II
    8 years ago

    Doesnt seem to work.  Explaining how i do it in excel...

     

    1. the lookup area numeric may not be in the grid, for example in excel when I use VLOOKUP by putting TRUE at the end it will return the nearest. e. 3.2 will use row with 0, 5.22 will use row of 5.2, 5.99 will use row of 5.9

    2. Once row is established, then use MATCH to cross reference the column number, eg. 2 will return column number 3, 3 will return column number 4 etc

    3. I use the result of the MATCH function in the VLOOKUP to "pick" the correct result

     

    How do i do this in POWER BI....

     

     

     

     

     

    I could colapse the table into a simpler table and then lookup.... by combining fields, in POWERBI how do i create this reference table, appending columns below each other ???

     

     

     

    My brain hurts....

     

    Thanks in advance for any wise words

     

    Paul

     

    • Anonymous's avatar
      Anonymous
      Not applicable
      8 years ago

      HI paulj1,

       

      You can enter to query editor and use unpivot columns function to transform your table as attribute and value columns.

      Power Query Unpivot Scenarios

       

       

      Then write formula to formual your area column:

      Format = 
VAR temp =
    ROUNDDOWN ( [Area], 1 )
RETURN
    IF (
        temp IN VALUES ( Grid[Size [m2]]] ),
        temp,
        MAXX ( FILTER ( ALL ( Grid ), Grid[Size [m2]]] < temp ), Grid[Size [m2]]] )
    )

       

       

      Regards,

      Xiaoxin Sheng

      • paulj1's avatar
        paulj1
        Helper II
        8 years ago

        Thank you Xiaoxin Sheng  :smileyhappy:

         

        i had done the unpivot, and was using a complicated if statement, but your solution is better.