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mechanix85's avatar
mechanix85
Helper I
9 years ago
Solved

Table.TransformColumns by criteria

Hello! How can I convert a column by a condition?

 

Something like this

if type = №2 and type2 = true then List.Product({_, -1}) else List.Product({_, 1})

???

 

 

 

Need Help
  • v-jiascu-msft's avatar
    v-jiascu-msft
    9 years ago

    Hi mechanix85,

     

    You could try this. It worked in my test.

     

    #"Replaced Value" = 
          Table.ReplaceValue(#"Changed Type1",
          each [value],
          each if [type] = "No2" and [type2] = true then [value] * -1 else [value] * 1,
          Replacer.ReplaceValue,{"value"}),

     

     

     

     

     

     

     

     

     

     

     

     

    Best Regards!

    Dale

5 Replies

  • v-jiascu-msft's avatar
    v-jiascu-msft
    Microsoft Employee
    9 years ago

    Hi mechanix85,

     

    You could try this formula.

     

    = if [type] = "No2" and [type2] = true then [value] * -1 else [value] * 1

     

     

     

     

     

     

     

     

     

     

     

     

     

     

    Notes: M is case sensitive.

     

    Best Regards!

    Dale

     

    • mechanix85's avatar
      mechanix85
      Helper I
      9 years ago

      v-jiascu-msft, Yes, i can do this, but I do not want to add new column... Table.TransformColumns can do it without new column, but I can not understand how to add a condition

      • v-jiascu-msft's avatar
        v-jiascu-msft
        Microsoft Employee
        9 years ago

        Hi mechanix85,

         

        You could try this. It worked in my test.

         

        #"Replaced Value" = 
          Table.ReplaceValue(#"Changed Type1",
          each [value],
          each if [type] = "No2" and [type2] = true then [value] * -1 else [value] * 1,
          Replacer.ReplaceValue,{"value"}),

         

         

         

         

         

         

         

         

         

         

         

         

        Best Regards!

        Dale

  • Anonymous's avatar
    Anonymous
    Not applicable
    4 years ago

    Hi, 

     

      Dale's solution does work for me. However I was wondering if there is a way to transform multiple columns in one step? Right now I have to repeat on every column I wish to transform.

     

      Thanks.

     

    Carl

  • eziola's avatar
    eziola
    New Member
    3 years ago

    Dale! The Table.ReplaceValue solution works great! I was able to add a custom function to this solution so I can reference other columns like this:

     

    =Table.ReplaceValue(

    table,

    each [ColumnToModify],

    each fx_CustomFunction( [ColumnAsArgument1], [ColumnAsArgument2] ),

    Replacer.ReplaceValue,

    {"ColumnToModify"}

    )

     

    Question for the thread:

    Does anyone know if there is a way to have Table.TransformColumns use other columns in the table as arguments to the transformation fuction? (like this...)


    Table.TransformColumns(

    table as table,

    {{column_name, fx_CustomFunction ( [ColumnAsArgument1], [ColumnAsArgument2] ), DataType}}

    )

     

    Thanks for any insight on this!