SQL - INSERT INTO Statement
• The INSERT INTO statement adds new rows to database tables using either explicit column lists or positional values, with explicit lists being safer and more maintainable in production code.
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Rust Slices: Views into Collections
A slice is a dynamically-sized view into a contiguous sequence of elements. Unlike arrays or vectors, slices don’t own their data—they’re references that borrow from an existing collection. This…
Read more →Rust From and Into Traits: Type Conversion
Rust’s strict type system prevents implicit conversions between types. You can’t pass an i32 where an i64 is expected, and you can’t use a &str where a String is required without explicit…
R tidyr - separate() Column into Multiple
• The separate() function splits one column into multiple columns based on a delimiter, with automatic type conversion and flexible handling of edge cases through parameters like extra and fill
R tidyr - unite() Columns into One
The unite() function from the tidyr package merges multiple columns into one. The basic syntax requires the data frame, the name of the new column, and the columns to combine.
R dplyr - ntile() - Bin into N Groups
The ntile() function from dplyr divides a vector into N bins of approximately equal size. It assigns each observation a bin number from 1 to N based on its rank in ascending order. This differs…
Python - Read File into List
The most straightforward approach uses readlines(), which returns a list where each element represents a line from the file, including newline characters:
How to Split Data into Train and Test Sets in Python
Every machine learning model needs honest evaluation. Training and testing on the same data is like a student grading their own exam—the results look great but mean nothing. You’ll get near-perfect…
Read more →How to Split Data into Train and Test Sets in R
Splitting your data into training and testing sets is fundamental to building reliable machine learning models. The training set teaches your model patterns in the data, while the test set—data the…
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