Hi CAM,
Your code is trying to stacking {'A1' 'B1' 'C1'} into one variable. Since C1 is text while A1 and B1 are numeric, an error will be returned due to imcompatible datatypes. In your case, you want to stack {'A1' 'A2',...'An'} into one variable. So "vars" should look like
vars = {{'A1','A2', , 'An'}, {'B1','B2', , 'Bn'}, {'C1','C2', , 'Cn'}}
Here is an example.
>> TestID = [100;101;102];
>> A1 = [1;2;3];
>> A2 = [4;5;6];
>> A3 = [7;8;9];
>> B1 = [0.1;0.2;0.3];
>> B2 = [0.4;0.5;0.6];
>> B3 = [0.7;0.8;0.9];
>> C1 = ["a";"b";"c"];
>> C2 = ["e";"f";"g"];
>> C3 = ["h";"i";"j"];
>> tblIn = table(TestID,A1,B1,C1,A2,B2,C2,A3,B3,C3);
>> stack(tblIn,{["A1" "A2" "A3"] ["B1" "B2" "B3"] ["C1" "C2" "C3"]},'NewDataVariableName',{'A' 'B' 'C'},'IndexVariableName','Reading')
ans =
9×5 table
TestID Reading A B C
______ _______ _ ___ ___
100 2 1 0.1 "a"
100 5 4 0.4 "e"
100 8 7 0.7 "h"
101 2 2 0.2 "b"
101 5 5 0.5 "f"
101 8 8 0.8 "i"
102 2 3 0.3 "c"
102 5 6 0.6 "g"
102 8 9 0.9 "j"
