Can anybody help me implement this logic in DAX? We are using direct query.

[Anonymous]

x, y, z are three different fields/columns with values x1, x2...; y1, y2...; and so on.

in case of x we just know "x1" and we need to find x2, x3, x4... in following manner:
x2= x1+y1-z1
x3= x2+y2-z2
and so on

all y and z field values are given but in case of x we just know x1.

How can we apply this in Dax to find x2, x3,....?

[Anonymous]

x, y, z are three different fields/columns with values x1, x2...; y1, y2...; and so on.

in case of x we just know "x1" and we need to find x2, x3, x4... in following manner:
x2= x1+y1-z1
x3= x2+y2-z2
and so on

all y and z field values are given but in case of x we just know x1.

How can we apply this in Dax to find x2, x3,....?

@tamerj1 

[tamerj1]

@Anonymous 

I peovided my answer here https://community.powerbi.com/t5/DAX-Commands-and-Tips/Can-anybody-help-me-implement-this-logic-in-DAX-We-are-using/m-p/2627761#M76741

[tamerj1 · Accepted solution]

Hi @Anonymous 

i assume that you have a unique date or index column. Otherwise you nee to create one. 

X =
VAR X1 = 1 --inset the initial value 
VAR CurrentIndex = TablName[Index]
VAR TableBefore =
    FILTER ( TablName, TablName[Index] < CurrentIndex )
VAR Y =
    SUMX ( TableBefore, TablName[Y] )
VAR Z =
    SUMX ( TableBefore, TablName[Z] )
RETURN
    X1 + Y - Z

[Anonymous]

How would these work if you can explain me? 

SUMX ( TableBefore, TablName[Y] )

SUMX ( TableBefore, TablName[Z] )

[tamerj1]

Hi @Anonymous 
Simple mathmatics

x2= x1+y1-z1
x3= x2+y2-z2 = x1+y1-z1+y2-z2 = x1 + (y1+y2) - (z1+z2) = x1 + SUMX (Y) - SUMX (Z)