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Tall Arrays
Tall arrays provide a way to work with data backed by a datastore
that can have millions or billions of rows. You can create tall numeric
arrays, cell arrays, categoricals, strings, datetimes, durations,
or calendar durations, and you can use any of these tall types as
variables in a tall table. Many operations and functions work the
same way with tall arrays as they do with in-memory MATLAB® arrays,
but most results are evaluated only when you request them explicitly
using gather. MATLAB automatically optimizes
the queued calculations by minimizing the number of passes through
the data. For more information, see Tall Arrays .
For more information about integrating with big data systems or compiling tall array algorithms, see Extend Tall Arrays with Other Products.
Functions
tall |
Create tall array |
datastore |
Create datastore for large collections of data |
mapreducer |
Define execution environment for mapreduce or tall arrays |
gather |
Collect tall array into memory after executing queued operations |
head |
Get top rows of tall array |
tail |
Get bottom rows of tall array |
topkrows |
Top rows in sorted order |
istall |
Determine if input is tall array |
classUnderlying |
Class of underlying data in tall array |
isaUnderlying |
Determine if tall array data is of specified class |
write |
Write tall array to disk for checkpointing |
Topics
Learn about tall arrays and perform an example calculation.
Functions That Support Tall Arrays (A–Z)
An alphabetical list of MATLAB functions that support tall arrays.
Deferred Evaluation of Tall Arrays
How to leverage deferred execution of tall arrays to optimize performance of calculations.
Index and View Tall Array Elements
Extract, assign, and view portions of a tall array.
Grouped Statistics Calculations with Tall Arrays
This example shows how to use the findgroups and splitapply functions to calculate grouped statistics of a tall table containing power outage data.
Visualization techniques that are specifically for tall arrays.
Extend Tall Arrays with Other Products
List of products that enhance capabilities of tall arrays.
