all tables in the bracketed expression must have the same number of variables. in matlab

If you get an error in MATLAB saying "All tables in the bracketed expression must have the same number of variables", it means that you are trying to concatenate tables with different numbers of variables.

To fix this error, you must make sure that all the tables have the same number of variables. One way to do this is to use the addvars function to add empty variables to the tables that are missing variables.

Here's an example code snippet to add empty variables to a table:

main.m
% example tables with different numbers of variables
t1 = table(rand(5,1),'VariableNames',{'var1'});
t2 = table(rand(5,1),rand(5,1),'VariableNames',{'var1','var2'});
t3 = table(rand(5,1),rand(5,1),rand(5,1),'VariableNames',{'var1','var2','var3'});

% add empty variables to make all tables have the same number of variables
nvars = max([width(t1),width(t2),width(t3)]);
t1 = addvars(t1,NaN(5,nvars-width(t1)),'After','var1');
t2 = addvars(t2,NaN(5,nvars-width(t2)),'After','var2');
t3 = addvars(t3,NaN(5,nvars-width(t3)),'After','var3');

% concatenate the tables
t_concat = [t1;t2;t3];
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In this code snippet, we first create three example tables with different numbers of variables (t1, t2, and t3). Next, we use the max function to find the maximum number of variables among the tables. We then add empty variables to each table using the addvars function, positioning these new variables at the end of the table. Finally, we concatenate the tables vertically using square bracket notation.

By adding empty variables to the tables, we ensure that all tables have the same number of variables, which can prevent the "All tables in the bracketed expression must have the same number of variables" error from occurring.