I recommend not using table as a variable name as table is the name of a data type in MATLAB.
Let's use your sample data.
>> sampleData = [72 60 12; 72 80 -8; 82 60 22; 82 80 2];
Build a table array using your sample data.
>> T = array2table(sampleData, 'VariableNames', ["F", "sigma", "m"]);
Turn the m variable from your table T into a categorical array with value "failure" when T.m is not greater than 0 and "success" when T.m is greater than 0.
>> SF = categorical(T.m > 0, [false, true], ["failure", "success"]);
Now add this variable to the table. I'm using a table variable name that is not a valid MATLAB identifier, which is allowed in a table since release R2019b. Use a different name if you're using an earlier release.
>> T.("Success/Failure") = SF
T =
4×4 table
F sigma m Success/Failure
__ _____ __ _______________
72 60 12 success
72 80 -8 failure
82 60 22 success
82 80 2 success
Let's get some data from T.
T(T.("Success/Failure") == "failure", :)
