Tables

There are several ways to create tables and assign data to them. You can create tables from input arrays, preallocate tables and fill them in later, or import tables from text files or spreadsheets.

If you want to control the import process beyond the options provided by the readtable function, such as defining how to handle missing data or errors, then create an import options object before importing the data.

Indexing into tables with parentheses, dot notation, and curly braces accesses table data in different ways. You can use indexing to create a table that is a subset of a larger table or to create an array from data in a table.

• Rename and Describe Table Variables
• Add, Delete, and Rearrange Table Variables
• Add and Delete Table Rows
• Clean Messy and Missing Data in Tables
• Using Row Labels in Table and Timetable Operations
• Convert Text in Table Variables to Categorical
• Add Custom Properties to Tables and Timetables

You can perform calculations directly on tables and timetables without indexing to extract their data. All the variables in your tables and timetables must have data types that support calculations.

• Calculations When Tables Have Both Numeric and Nonnumeric Data
• Summarize or Pivot Data in Tables Using Groups
• Perform Calculations by Group in Table
• Rules for Table and Timetable Mathematics

Create plots by passing tables directly to plotting functions.

Use tables to store mixed-type data conveniently, access data with numeric or named indexing, and to store metadata.

Tables can raise compatibility warnings, and change dimension names, when you modify the DimensionNames property.