Error using trainNetwork - possible change with Matlab release?

I am attempting to run some code in R2022b which I haven't run for a while. I believe I have updated Matlab since then and I probably last ran it in 2022a. I have a new error (with no changes to the code):

Error using trainNetwork

To assign to or create a variable in a table, the number of rows must match the height of the table.

However, I am not attempting to use tables.

I am attempting to run

net = trainNetwork(XTrain,YTrain,layers,options);

where Xtrain is a 28x28x3x10000 numeric array of (small) RGB images, and YTrain is a 10000x1 numeric array of training values. The task is a regression task so I believe that both inputs can be in numeric form. Perhaps this has changed, though it's not clear from the help?

There is no other information in the error message.

[Jenny Bosten]

Thanks for any insight anyone can give!

[Jenny Bosten]

Embarrassingly, the code has now started running as it was originally. The only thing I did differently was to run an even older script before that was very similar but produced a figure to visualise training progress. I cleared all variables before running the script so it wasn't that. I can't explain it but the glitch seems to be over. Not sure if I can delete the post.

Answer 1

[Matt J]

Convert the data to cell array form.

XTrain=num2cell(Xtrain,[1,2,3]);  XTrain=XTrain(:);
YTrain=num2cell(YTrain);          YTrain=YTrain(:);

[Jenny Bosten]

Thanks Matt for your answer. Once the data are in cell array format (using your code) I still get the same error. For some reason it seems to be expecting a table. I am not really familiar with tables, but according to the help other data formats should still be acceptable. Here is the full error message:

Error using trainNetwork

To assign to or create a variable in a table, the number of rows must match the height of the

table.

Error in TrainCNNTaskExptMunsellProbesLoop (line 169)

net = trainNetwork(XTrain,YTrain,layers,options);

Caused by:

Error using .

To assign to or create a variable in a table, the number of rows must match the height of

the table.

[Matt J]

I suggest attaching the layers and options in a .mat file so that we can all examine it.