# \#dataframemacros

**URL:** https://discourse.julialang.org/tag/dataframemacros/1340.md

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## [Prefixing output columns which are returned as Dataframe](https://discourse.julialang.org/t/prefixing-output-columns-which-are-returned-as-dataframe/98098)

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**Author:** [@mreichMPI-BGC](https://discourse.julialang.org/u/mreichMPI-BGC)\
**Replies:** 9\
**Last updated:** [April 30, 2023, 9:36am UTC](https://discourse.julialang.org/t/prefixing-output-columns-which-are-returned-as-dataframe/98098 "2023-04-30T09:36:31Z")

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Sorry, I am stuck a bit…: Suppose I have a function that takes Vectors and returns a DataFrame of the same length as the Vectors (e.g. my calc function below). function calc(x1,x2) y1 = accumulate(+, x1+x2 .+ 0.1ra…