preview

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

ds = tabularTextDatastore("airlinesmall_subset.csv","TreatAsMissing","NA",...
    "MissingValue",0);

Modify the SelectedVariableNames property to specify the variables of interest.

ds.SelectedVariableNames = ["DepTime","ArrTime","ActualElapsedTime"];

Preview the data for the selected variables.

data = preview(ds)

data=8×3 table
    DepTime    ArrTime    ActualElapsedTime
    _______    _______    _________________

     2117       2305             108       
     1252       1511              79       
     1441       1708              87       
     2258       2336              38       
     1814       1901              47       
     1822       1934              72       
      729        841              72       
     1704       1829              85       

Create a datastore from the sample file, mapredout.mat, which is the output file of the mapreduce function.

ds = datastore('mapredout.mat');

Preview the data in the datastore.

data = preview(ds)

data=1×2 table
     Key        Value  
    ______    _________

    {'AA'}    {[14930]}

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 datastore imds1 representing a collection of three images.

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

Create a second datastore imds2 by transforming the images of imds1 to grayscale and then reflecting the images horizontally.

imds2 = transform(imds1,@(x) fliplr(im2gray(x)));

Create a combined datastore from imds1 and imds2.

imdsCombined = combine(imds1,imds2);

Preview the data in the combined datastore. The output is a 1-by-2 cell array. The two columns represent the first subset of data from the two underlying datastores imds1 and imds2, respectively.

dataOut = preview(imdsCombined)

dataOut=1×2 cell array
    {480x640x3 uint8}    {480x640 uint8}

Display the previewed data as a pair of tiled images.

tile = imtile(dataOut);
imshow(tile)