Replicating excel formula | precedent referencing

[Anonymous]

Hello community,

Need help in replicating the following formula in DAX or in power query -

In Excel we can easily use precedent referencing but in dax or power query I haven't found anything, i need ut for below use, in first screenshot it's the evaluated values, and in second, formulas behind those, i just need a way i can do the same in power bi at the end,

note that first values are manually entered '0'

can anyone please help? need this urgently for a very large database
copy paste the values from below to test out 

Total engine hours	Pulse
0	0
0.8	0.8
1.65	1.65
0.3	1.65
0.3	1.65
6.1	7.45
1.15	7.45

[AlienSx]

Hi, @Anonymous 

let
    Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
    data = List.Buffer(Source[Total engine hours]),
    max_count = List.Count(data),
    pulse = 
        List.Generate(
            () => [i = 0, p = 0],
            (x) => x[i] < max_count,
            (x) => [i = x[i] + 1, p = if (data{i} >= data{x[i]}) then x[p] + data{i} - data{x[i]} else x[p]],
            (x) => x[p]
        ),
    out = Table.FromColumns({data, pulse}, {"Total engine hours", "Pulse"})
in
    out

[Anonymous]

@AlienSx, this sort of solves my issue, but my actual data comes from sql database which has this 'Total engine hours' with multiple other columns, which of the bits i would need to edit then?

[AlienSx · Accepted solution]

let
    Source = your_source_table,
    data = List.Buffer(Source[Total engine hours]),
    max_count = List.Count(data),
    pulse = 
        List.Generate(
            () => [i = 0, p = 0],
            (x) => x[i] < max_count,
            (x) => [i = x[i] + 1, p = if (data{i} >= data{x[i]}) then x[p] + data{i} - data{x[i]} else x[p]],
            (x) => x[p]
        ),
    out = Table.FromColumns(Table.ToColumns(Source) & {pulse}, Table.ColumnNames(Source) & {"Pulse"})
in
    out

[Anonymous]

I believe this will definitely help, thank you so much!

Do you know if there's a way we can achieve the same through DAX?

[AlienSx]

DAX - most likely yes but I am not a DAX guy (yet) 😎 

[Anonymous]

Pretty sure you will reach there very soon, really appreciate your help!