MATLAB: Undefined function or variable ‘arrayDatastore’.

Question

I am trying to run the code https://www.mathworks.com/help/deeplearning/ug/train-network-with-multiple-outputs.html

I can run this line:

[XTrain,YTrain,anglesTrain] = digitTrain4DArrayData;

However, when I run this line

dsXTrain = arrayDatastore(XTrain,'IterationDimension',4);

It comes

Undefined function or variable 'arrayDatastore'.

So I think I dont have the function of "arrayDatastore"

Then I searched this website https://www.mathworks.com/help/matlab/ref/matlab.io.datastore.arraydatastore.html

I run

>> A = magic(10);

>> arrds = arrayDatastore(A);

Undefined function or variable 'arrayDatastore'.

Answer 1

arraydatastore(): https://www.mathworks.com/help/matlab/ref/matlab.io.datastore.arraydatastore.html was introduced i R2020b. You cannot use it in R2019a.