matlab.io.datastore.DsFileSet.maxpartitions - Maximum number of partitions - MATLAB (original) (raw)

Main Content

Class: matlab.io.datastore.DsFileSet
Namespace: matlab.io.datastore

Maximum number of partitions

Syntax

N = maxpartitions(fs)

Description

[N](#d126e443338) = maxpartitions([fs](#mw%5Fe3d87b95-dec9-4a02-bca8-cf0caf462b3d)) returns the maximum number of partitions for a given DsFileSet objectfs.

Input Arguments

Output Arguments

expand all

N — Number of partitions

positive integer

Number of partitions, returned as an integer. The value ofN depends on the FileSplitSize property of the DsFileSet object.

• If FileSplitSize contains'file', thenmaxpartitions sets N equal to the total number of files infs.
• If FileSplitSize contains a numeric value, then maxpartitions determinesN as the sum of theceil of the file sizes of each file divided by the FileSplitSize.

Examples

Get Maximum Number of Partitions for the File-Set Object

Create a file-set object and get the number of partitions for different values of the FileSplitSize property.

Create a file-set object for all .mat files in a folder and check the number of files.

folder = fullfile(matlabroot,'toolbox','matlab','demos');
fs = matlab.io.datastore.DsFileSet(folder,'FileExtensions','.mat'); fs.NumFiles

The FileSplitSize property of the DSFileSet object is set to 'file'. Therefore,maxpartitions returns a value equal to the number of files.

Set the FileSplitSize property to a numeric size (2000 bytes) and compute maxpartitions.

fs = matlab.io.datastore.DsFileSet(folder,... 'FileExtensions','.mat',... 'FileSplitSize',2000); n = maxpartitions(fs)

Version History

Introduced in R2017b