Sorry for late response 
For summary with if function i had to create a new table with coppied dimensions in first column, (lets call it simple "Table").
I that column i coppied dimensions from original table in first columne "Category" (for example dimensions 1 to 5) and added two additional dimensions (Dimension 6: Sum; Dimension 7: Average ).
In the second column ("Values") I writed values:
- 0 for dimensions 1 to 5
- 1 for dimension Sum
- 2 for dimension Average.
Then I connected new table to table with original dimensions.
Then I created formula 3 formulas,
- one for calculation i wanted in Matrix. Name of formula = [Calculation]
- one for Sum. Name of formula = [Sum]
- one for Average. Name of formula = [Average]
The last formula was with IF:
Ifformula:=if(
max(Table[Values])=1;[Sum];if(
max(Table[Values])=2;[Average];
[Calculation]))
In Power BI then I created matrix visualisation with categories from created table (With name "Table" ) and with IF formula.
I am not sure if this formula is perfectly correct, but i hope you get the idea. This way of using IF also works for calculating values between rows. However, it has many problems:
- It is to complicate, it takes too much time
- It works pretty good in Power Pivot, but in Power BI, does not work always (maybe bugs?)
- For example, in Power BI it works only if i don't sort data in tables.
Greetings,
Matej