kolumnindex

Kolumnindex is the numeric position of a column within a tabular data structure. It is used to access or manipulate data by column position rather than by column name. Kolumnindex appears in various contexts, including spreadsheets, CSV parsers, database APIs, and data frame libraries, where programs may need to reference columns for iteration, transformation, or aggregation.

Indexing schemes differ by environment. Most general-purpose programming languages use zero-based indexing, where the first column has kolumnindex 0, while some spreadsheet APIs or languages adopt one-based indexing, where the first column has kolumnindex 1. Knowing the convention is essential to avoid off-by-one errors.

Common uses include retrieving a value from a specific column in a row, performing column-wise operations such as normalization, or iterating through columns in algorithms. Kolumnindex is often paired with a corresponding header or schema to map the position to a meaningful label.

When parsing data, keeping track of kolumnindex is important if headers are present or if columns can be reordered, hidden, or added. Misalignment between column indices and data can lead to incorrect results or runtime errors.

In practice, developers may refer to kolumnindex as a column ordinal or positional index. Tools and languages may provide helper functions to convert between a column index and a column name, or to translate a human-friendly column label into an index for programmatic use.