Subscript a table error while indexing

Hello, anyone help me please..

>> table(TestY{idx},label{idx},Posterior{idx,:},'VariableNames',['TrueLabel','PredLabel','Posterior'])

Subscripting into a table using one subscript (as in t(i)) or three or more subscripts (as in t(i,j,k)) is not supported.

Always specify a row subscript and a variable subscript, as in t(rows,vars).

[Siddharth Bhutiya]

Looks like TestY or label might be a table and as the error mentions, you need 2 indices to subscript into a table. Something like the following

t{:,idx}