How to join datasets?

I need to join some columns in the dataset attached below. When I joined the columns int_rate and id with the following code, it works.

TrainInputs = [TrainDataset.int_rate,TrainDataset.id]

But when I was trying to join the columns int_rate and sub_grade, it failed.

TrainInputs = [TrainDataset.int_rate,TrainDataset.sub_grade]
Error using horzcat
Dimensions of matrices being concatenated are not consistent.

Could you help me find out why and how should I do this? Thank you for your time.

Answer 1

[Muhammad Usman Saleem]

check this in both columns vectors, these are not of same length.

TrainDataset.int_rate and TrainDataset.id are not of same length to concatenated. Always concatenate vector of same lengths

[Xinyuan Wei]

Thank you for your reply. But I still cannot understand.These three columns should all have 50 rows.

>> size(TrainDataset.id)

ans =

    50     1

>> size(TrainDataset.int_rate)

ans =

    50     1

>> size(TrainDataset.sub_grade)

ans =

    50     1

Why matlab says they are not of the same length?

[Muhammad Usman Saleem]

You can't horizontally concatenate scalars with matrices or column vector, hence the error.

Find out which variable is the culprit on why it's not scalar (or why you're using a non-scalar variable in your expression.

As i do not know how you three column vectors looks, The attached .m file also not opening. Please upload here its content