---
title: "categorical-matrix"
slug: "categorical-matrix-parser"
updated: 2022-07-27T17:30:36Z
published: 2022-07-27T17:30:36Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://code.tag.bio/llms.txt
> Use this file to discover all available pages before exploring further.

# categorical-matrix

The *categorical-matrix* **parser** will load data from multiple rows and columns from a source data table into categorical **variables** within **collections**.

It inherits attributes and data loading behaviors from the abstract *matrix* **parser** type.

## Example

```
{
  "parser_type": "categorical-matrix",
  "collection": "collection_name",
  "variable": "variable_name,
  
  // The parser does all the work to load the data into a single
  // collection with multiple variables. These will then be converted
  // into a matrix in post-processing.
  "parser": {
    "parser_type": "categorical-row",
    "variable": {
      "parser_type": "categorical",
      "column": "row_header_column_name"
    },
    "indicator": "1"
  }
}
```