Hi @예림 안,
You mentioned, “The picture is the truth table I wrote, and I want to set the output value differently according to the input value through it. However, when I run it, the following missing cases were found in the condition table. F F F T T F T T F T F T T F T T - F F T T T T - F F T T T T - - F T An error is displayed and The Truth Table using MATLAB language must be fully specified. The truth table is underspecified or the specification of the truth table cannot be determined. To fully specify this truth table, try adding a default (all don't care) decision. An error occurs saying Errors occurred during truth table parsing. What should I fix?”
Please see my response to your comments below.
To resolve the issues with your truth table in MATLAB, you'll need to make sure that every possible combination of input values (true/false) is accounted for in your truth table. The output values must be specified for each combination, and if any combination is not explicitly defined, you should include a default case (often referred to as "don't care" conditions) to avoid parsing errors. Here’s a step-by-step approach to fixing the truth table and a sample MATLAB code to illustrate how to implement it:
Define All Input Combinations: Each input variable must be represented in every possible state (true or false). For three binary inputs (A, B, C), there are 2^3 = 8 combinations.
Specify Outputs for Each Combination: Make sure to define the output for each combination. Use a default value for cases that aren't explicitly defined.
Use MATLAB’s truthTable Functionality: MATLAB has built-in functions for truth tables, and you can also utilize conditional statements to define outputs based on your specified conditions.
Here’s an example code snippet to help you define a truth table and handle the specified conditions:
% Define input conditions u = 0.35; % Example input, you can change this value as needed
% Initialize outputs D1 = 'F'; D2 = 'F'; D3 = 'F'; D4 = 'F';
% Define conditions for outputs based on input value if u >= 0.34 D1 = 'T'; elseif u >= 0.32 D2 = 'T'; elseif u >= 0.30 D3 = 'T'; elseif u >= 0.28 D4 = 'T'; end
% Display the results disp(['D1: ', D1]); disp(['D2: ', D2]); disp(['D3: ', D3]); disp(['D4: ', D4]);
% Example truth table representation truthValues = [0 0 0; 0 0 1; 0 1 0; 0 1 1; 1 0 0; 1 0 1; 1 1 0; 1 1 1]; outputs = zeros(size(truthValues, 1), 1);
for i = 1:size(truthValues, 1) A = truthValues(i, 1); B = truthValues(i, 2); C = truthValues(i, 3);
% Define output based on input combinations
if A == 0 && B == 0 && C == 0
outputs(i) = 0; % Example output
elseif A == 0 && B == 0 && C == 1
outputs(i) = 1; % Example output
elseif A == 1 && B == 0 && C == 0
outputs(i) = 1; % Example output
% [Add more combinations here]
else
outputs(i) = -1; % Default case for undefined combinations
end
end% Display truth table results
disp('Truth Table:');
disp(array2table([truthValues outputs], 'VariableNames', {'A', 'B',
'C', 'Output'}));
Please see attached.
Please let me know if this helped resolve your problem.
