If you are entering values into table using array, you cannot change the values of the last row from double to int as data type of the elements should be same in the arrays.
As a workaround, you can use cell array to store data into table and then change the datatype of the rows as shown in the following code snippet.
app.UITable.Data = {23.34,1.343,343.2;5.0000, 25.0000, 100.0000};
app.UITable.Data(2,:)=num2cell(int8(cell2mat(app.UITable.Data(2,:))));
