hasdata

Determine if data is available to read from datastore

Syntax

tf = hasdata(ds)

Description

tf = hasdata(ds) returns logical 1 (true) if there is data available to read from the datastore specified by ds. Otherwise, it returns logical 0 (false).

Examples

Determine Pixel Data Available to Read

Check if pixel label data can be read from a datastore.

Set the location of the image and pixel label data.

dataDir = fullfile(toolboxdir('vision'),'visiondata');
imDir = fullfile(dataDir,'building');
pxDir = fullfile(dataDir,'buildingPixelLabels');

Create an image and pixel label datastore.

imds = imageDatastore(imDir);
classNames = ["sky" "grass" "building" "sidewalk"];
pixelLabelID = [1 2 3 4];
pxds = pixelLabelDatastore(pxDir,classNames,pixelLabelID);

While data is available in the datastore, read the data.

while hasdata(pxds)
    T = read(pxds);
end

Input Arguments

ds — Datastore with labeled data

PixelLabelDatastore object | pixelLabelImageDatastore object | boxLabelDatastore object

Datastore with labeled data for training a semantic segmentation network or an object detection network, specified as a pixelLabelDatastore, pixelLabelImageDatastore, or boxLabelDatastore object.

Output Arguments

tf — Datastore data status

1 | 0

Datastore data status, returned as a logical 1 (true) if there is data available to read from the datastore specified by ds. Otherwise, it returns logical 0 (false).