converting a variable in a table from cell to double

I am trying to read some tables and concatenate them in one big table, but I am getting the following error

Cannot concatenate the table variable 'foE' because it is a cell in one table and a non-cell in another.

attached is the table "t1" that I am trying to read. the type of the variable in the other table is double, so how can I convert foE from cell to double

I am using the following lines to read the data

for kk = 1 : nfiles
fprintf('.......... File - %d of %d\n',kk, nfiles)
fullFileName = fullnames{kk}; 
t1 = readtable(fullFileName);  %t1 stores the table from each file

if kk==1
      Iono=t1;
  else
      Iono=[Iono; t1];
end

[Davide Masiello]

You could use cell2mat.

[Jan]

The error message is not useful without seeing the corresponding code. Please edit the question and add it.

[Salma fathi]

Thanks for your comment, i added the code that I am using to read the data.

[Salma fathi]

@Davide Masiello thank you for your comment, I tried cell2mat and got the following error

Brace indexing is not supported for variables of this type.
Error in cell2mat (line 42)
cellclass = class(c{1});
Error in Read_Split_Iono (line 32)
t1.foE = cell2mat(t1.foE);

Answer 1

[Cris LaPierre]

Your variable is a cell because many of your values are '---'. Try this

t1.foE = str2double(t1.foE);

[Salma fathi]

I did tried this before and got the folloing error

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

[Cris LaPierre]

That is a separate error, and has more to do with what you are trying to do with the result than the conversion itself. Share the code that corresponds to that error message.