Specify the file path to the example signals included with MATLAB®. Create a signal datastore that points to the specified folder.

folder = fullfile(matlabroot,'toolbox','matlab','audiovideo'); sds = signalDatastore(folder,'SampleRateVariableName','Fs');

Get the default number of partitions for the signal datastore.

n = numpartitions(sds)

n = 7

Partition the datastore into the default number of partitions and return the datastore corresponding to the fourth partition.

subsds = partition(sds,n,4);

Use theextractAfterfunction to display the name of the file contained in the datastore corresponding to the fourth partition.

fname = extractafter（subsds.files，'audiovideo\')

fname =1x1 cell array{0x0 char}

Read the data and information about the signal in the datastore corresponding to the fourth partition. Extract the sample rate frominfoand resample the signal to half the original sample rate. Plot the original and resampled signals.

whilehasdata（subsds）[data，info] = read（subsds）;fs = info.samplater;f_res = 0.5*fs;ts =（0：长度（data）-1）/fs;data_res = respample（数据，1,2）;t_res =（0：长度（data_res）-1）/f_res;图（TS，DATA，T_RES，DATA_RES，':'）xlabel（'Time (s)'）ylabel（'Signal') legend('Original','Resampled','地点','NorthWest')end

Specify the path to a directory containing example signals included with MATLAB®.

folder = fullfile(matlabroot,'toolbox','matlab','audiovideo');

Create a signal datastore that points to the specified folder.

sds = signalDatastore(folder);

给定当前的并行池，返回对并行处理的合理数量分区的估计值。

pool = gcp;

Starting parallel pool (parpool) using the 'local' profile ... Connected to the parallel pool (number of workers: 6).

n = numpartitions(sds,pool)

n = 7

Partition the signal datastore and read the signal data in each part.

parforII = 1：n subds =分区（SDS，N，II）;whilehasdata(subds) data = read(subds);endend