
code-of-kai
Chapter 1: Dataframe Column Reference Bug (updated)
Location: In Chapter 1, on page 14
Description: While attempting to cast the species
column to a category in normalized_iris
, the code snippet:
normalized_iris = DF.mutate(normalized_iris, [
species: Explorer.Series.cast(species, :category)
])
produces an undefined variable error for species
.
Solution: Update the code to include the pin operator (^
) for referencing species
correctly from normalized_iris
:
normalized_iris = DF.mutate(normalized_iris, [
species: Explorer.Series.cast(^normalized_iris["species"], :category)
])
This adjustment ensures species
is correctly pinned, resolving the undefined variable error.
Also the author should consider replacing DF with df as that is what is used in the Explorer library.
First Post!

nunez
I wonder if you required the DataFrame library prior to this.
I was able to run this as is. I did run into a casting issue with the Z-Score Standardization. Thanks for sharing.
Popular Pragmatic Bookshelf topics

Running the examples in chapter 5 c under pytest 5.4.1 causes an AttributeError: ‘module’ object has no attribute ‘config’.
In particula...
New

Title: Hands-On Rust (Chapter 11: prefab)
Just played a couple of amulet-less games. With a bit of debugging, I believe that your can_p...
New

I can’t setup the Rails source code. This happens in a working directory containing multiple (postgres) Rails apps.
With:
ruby-3.0.0
s...
New

Running mix deps.get in the sensor_hub directory fails with the following error:
** (Mix) No SSH public keys found in ~/.ssh. An ssh aut...
New

Is there any place where we can discuss the solutions to some of the exercises? I can figure most of them out, but am having trouble with...
New

I’m a newbie to Rails 7 and have hit an issue with the bin/Dev script mentioned on pages 112-113.
Iteration A1 - Seeing the list of prod...
New

Skimming ahead, much of the following is explained in Chapter 3, but new readers (like me!) will hit a roadblock in Chapter 2 with their ...
New

Book: Programming Phoenix LiveView, page 142 (157/378), file lib/pento_web/live/product_live/form_component.ex, in the function below:
d...
New

Title: Agile Web Development with Rails 7: (page 70)
I am running windows 11 pro with rails 7.0.3 and ruby 3.1.2p20 (2022-04-12 revision...
New

root_layout: {PentoWeb.LayoutView, :root},
This results in the following following error:
no “root” html template defined for PentoWeb...
New
Other popular topics

Which, if any, games do you play? On what platform?
I just bought (and completed) Minecraft Dungeons for my Nintendo Switch. Other than ...
New

I’m thinking of buying a monitor that I can rotate to use as a vertical monitor?
Also, I want to know if someone is using it for program...
New

No chair. I have a standing desk.
This post was split into a dedicated thread from our thread about chairs :slight_smile:
New
New

Small essay with thoughts on macOS vs. Linux:
I know @Exadra37 is just waiting around the corner to scream at me “I TOLD YOU SO!!!” but I...
New

The V Programming Language
Simple language for building maintainable programs
V is already mentioned couple of times in the forum, but I...
New

Build efficient applications that exploit the unique benefits of a pure functional language, learning from an engineer who uses Haskell t...
New

I have always used antique keyboards like Cherry MX 1800 or Cherry MX 8100 and almost always have modified the switches in some way, like...
New

zig/http.zig at 7cf2cbb33ef34c1d211135f56d30fe23b6cacd42 · ziglang/zig.
General-purpose programming language and toolchain for maintaini...
New

This is a very quick guide, you just need to:
Download LM Studio: https://lmstudio.ai/
Click on search
Type DeepSeek, then select the o...
New
Categories:
Sub Categories:
Popular Portals
- /elixir
- /rust
- /wasm
- /ruby
- /erlang
- /phoenix
- /keyboards
- /rails
- /js
- /python
- /security
- /go
- /swift
- /vim
- /clojure
- /emacs
- /haskell
- /java
- /onivim
- /typescript
- /svelte
- /crystal
- /kotlin
- /c-plus-plus
- /tailwind
- /react
- /gleam
- /ocaml
- /elm
- /flutter
- /vscode
- /ash
- /html
- /opensuse
- /centos
- /php
- /deepseek
- /zig
- /scala
- /sublime-text
- /textmate
- /lisp
- /nixos
- /debian
- /react-native
- /agda
- /kubuntu
- /arch-linux
- /django
- /revery
- /ubuntu
- /spring
- /manjaro
- /nodejs
- /diversity
- /lua
- /julia
- /c
- /slackware
- /markdown