Undefined variable "X" or class "X".

I got this error from this code but not sure why even though i just copy it from the mathworks. i have already update my matlab to 2017b.

load JapaneseVowelsTrain
figure
for i = 1:12
     subplot(12,1,13-i)
    plot(X{1}(i,:));
    ylabel(i) 
    xticklabels('')
    yticklabels('')
    box off
end
title("Training Observation 1")
subplot(12,1,12)
xticklabels('auto')
xlabel("Time Step")

error:

Undefined variable "X" or class "X".
Error in lstm (line 6)
    plot(X{1}(i,:));

any help would be appreciated.

[Mohammed khalaf]

This is the link

https://uk.mathworks.com/help/nnet/ref/nnet.cnn.layer.lstmlayer.html?s_tid=doc_ta

Answer 1

[Jan]

You have asked this some days ago already: https://www.mathworks.com/matlabcentral/answers/375923-implement-to-predict-japanesevowelstrain-as-the-same-in-mathworks . Walter has answered:

 JapaneseVowelsTrain does not contain a variable named X: it 
 contains a variable named XTrain

Why do you ask for "X" again now?

[Mohammed khalaf]

the previous error was Cell contents reference from a non-cell array object.

now get another error.

Undefined variable "X" or class "X".

I have re-opend the matlab again and the problem solved.

sorry a bit new to matlab that's why i ask the community for help.

thanks anyway