DataFrame vs. Pandas (vs. Excel...), e.g. to refer to previous row

[kevbonham]

Quoting from the thing I linked above:

@Tamas_Papp

1. • Post quoted code by enclosing code blocks in triple-backticks ````` :

```julia
function f(x, y)
    x + y
end
```

…

3. Do your best to make your example self-contained (“minimal working example”, MWE ), so that it runs (or gets to the error that you want help with) as is. This means including package loading (e.g. using ThatPackage ) and any data that the code operates on. If your data is large or proprietary, generate example data if possible and include that.
4. Simplify your code to the smallest piece of code that still shows your problem. This step takes the most effort but is the most important for fixing your problem. Short, simple examples tend to get answers quickly.

The stuff you put is a start, but because I don’t know what your df is, it can’t run. Sometimes, it’s as easy as doing df = DataFrame(a=repeat([:x,:y], 5), b=rand(10)). But it’s important to have code that runs, and a clear indication of what you want.