For loop over rows comprising multiple columns

[Elnaz91]

Hi,

I am trying to interate over rows and calculate this equation for my new column:

For every row:

     if column1[i] = 1 then Newcolumn[i] =0

     Else Newcolumn[i] = MAX(0, MAX(Newcolumn[i-1]+column2[i])+column3[i])

column 1	column2	column3	new column	new column formula
			0	0
1	-1000	-100	0	0
0	-1000	1500	1500	max(0,max(0,0-1000)+1500)=1500
0	0	100	1600	max(0,max(0,1500+0)+100)=1600
0	-1000	-60	540	max(0,max(0,1600-1000)-60)=540
1	-1000	1000	1000	0
	all values are <=0

I tried to implement it with List.Accumulate, however, I have a problem calling three different columns in their expression. My main problem is the 2nd max function comprising the recursive term. 

I also implement it as a recursive function but it never stops.

I hope one could help me! It's been more than a week and I am still struggling with it.

Thanks a lot

Elnaz

[edhans]

You are going to need to post some data so someone here can help.

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[Elnaz91]

Thanks for the tip. The example is as follow:

For every row:

     if column1[i] = 1 then Newcolumn[i] =0

     Else Newcolumn[i] = MAX(0, MAX(Newcolumn[i-1]+column2[i])+column3[i])

column 1	column2	column3	new column	new column formula
			0	0
1	-1000	-100	0	0
0	-1000	1500	1500	max(0,max(0,0-1000)+1500)=1500
0	0	100	1600	max(0,max(0,1500+0)+100)=1600
0	-1000	-60	540	max(0,max(0,1600-1000)-60)=540
1	-1000	1000	1000	0
	all values are <=0