Skip to main content
Ctrl+K
Logo image Logo image

Site Navigation

  • Getting started
  • User guide
  • API reference
  • Contributor guide
  • Release history

Site Navigation

  • Getting started
  • User guide
  • API reference
  • Contributor guide
  • Release history

Section Navigation

  • 10 minutes to Awkward Array
  • Converting arrays
    • NumPy
    • Python objects
    • JSON
    • Arrow and Parquet
    • Pandas
    • Generic buffers
    • ROOT via RDataFrame
  • Creating new arrays
    • Arrays of lists
    • Arrays of records
    • Arrays of missing data
    • Arrays of strings
    • Unflattening and grouping [todo]
    • ArrayBuilder (easy & general)
    • Direct constructors (fastest)
  • Examining arrays
    • Data type [todo]
    • Single item detail [todo]
    • Listing fields/keys/columns
    • Simple slicing [todo]
    • Checking validity [todo]
  • Numerical math
    • NumPy functions [todo]
    • Awkward broadcasting [todo]
    • Reducing (sum/min/any/all) [todo]
    • Statistics (mean/var/std) [todo]
    • Using argmin/argmax [todo]
    • On GPUs [todo]
  • Filtering data
    • By number of items [todo]
    • Cuts vs. masks [todo]
    • Slicing lists within arrays
    • Slices with missing values [todo]
  • Restructuring data
    • Zip/unzip and project
    • Adding fields to records
    • Renaming records [todo]
    • Flattening for plots
    • Padding/clipping for machine learning
    • Concatenating and interleaving [todo]
    • Sorting [todo]
  • Combinatorics
    • Cartesian and "n choose k" [todo]
    • Best match between collections [todo]
  • Using arrays in Numba
    • Supported features [todo]
    • Building array output [todo]
  • Specialized behavior
    • Subclassing Array/Record [todo]
    • Overriding NumPy functions [todo]
    • In Numba [todo]
    • For physics: Lorentz vectors [todo]
    • Differentiation using JAX
    • Building Awkward Arrays in C++

Examining arrays#

  • Data type [todo]
  • Single item detail [todo]
  • Listing fields/keys/columns
  • Simple slicing [todo]
  • Checking validity [todo]

previous

Direct constructors (fastest)

next

How to examine an array’s type
Edit this page
Show Source

© Copyright 2022, Awkward Array development team.

Created using Sphinx 4.5.0.

Support for this work was provided by NSF cooperative agreement OAC-1836650 (IRIS-HEP), grant OAC-1450377 (DIANA/HEP), PHY-1520942 (US-CMS LHC Ops), and OAC-2103945 (Awkward Array).