[Qgis-user] calculating progressive value

[Salvatore Oliveto]

Hi, I have a Qgis layer with a table with twno columns X and Y.
The X column has a set of values​​, while in the Y column I have to enter,
using field calculator, for each record the progressive value. Eg : X
column values: a , b , c , d ; Y column values (to be calculated with the
field calculator from Y column): a; a + b; a + b + c; a + b + c + d.

How can I do this?

thank you
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