Create anImageDatastoreobject containing four images.

imds = imageDatastore({'street1.jpg','street2.jpg','peppers.png','corn.tif'});

Read all the data in the datastore.

T = readall(imds);

Examine the output.

imout = imtile(T); imshow(imout)

Create a datastore from the sample fileairlinesmall.csv, which contains tabular data.

ds = tabularTextDatastore('airlinesmall.csv','TreatAsMissing','NA');

Specify the variables of interest using theSelectedVariableNamesproperty.

ds.SelectedVariableNames = {'DepTime','ArrTime','ActualElapsedTime'};

Read all the data in the datastore in parallel.

T = readall(ds,'UseParallel',true);

readallreturns all the data in a table.

View information about the table. Only the selected variables are included in the output.

T.Properties

ans = TableProperties属性:描述: '' UserData: [] DimensionNames: {'Row' 'Variables'} VariableNames: {'DepTime' 'ArrTime' 'ActualElapsedTime'} VariableDescriptions: {} VariableUnits: {} VariableContinuity: [] RowNames: {} CustomProperties: No custom properties are set. Use addprop and rmprop to modify CustomProperties.

Create a datastore that maintains parity between the pair of images of the underlying datastores. For instance, create two separate image datastores, and then create a combined datastore representing the two underlying datastores.

Create an image datastoreimds1representing a collection of three images.

imds1 = imageDatastore({'street1.jpg','street2.jpg','peppers.png'});

Create a second datastoreimds2by transforming the images ofimds1to grayscale and then downsizing the images.

imds2 = transform(imds1,@(x) imresize(im2gray(x),0.5));

Create a combined datastore fromimds1andimds2.

imdsCombined = combine(imds1,imds2);

Read all of the data from the combined datastore. The output is a 3-by-2 cell array. The two columns represent all of the read data from the two underlying datastoresimds1andimds2, respectively.

dataOut = readall(imdsCombined)

dataOut=3×2 cell array{480x640x3 uint8} {240x320 uint8} {480x640x3 uint8} {240x320 uint8} {384x512x3 uint8} {192x256 uint8}