I am trying to create a function but continue to get this error: function score = compute_iss_score(a) ↑ Error: Function d -could someone tell me what I am doing incorrectly?

% Clear command window and workspace
clear all
clc 
%The goal of this lab is to create a system which can analyze data and
% asses the severity of a traumatic injury.
% Define the AIS scores in a matrix, a
a = [0 3 4 5 3 0]
% To begin, create a function that will use array data as an input and will
% return the ISS score
function score = compute_iss_score(a)
% To ensure the score is accurate, check that all six AIS scores are
% present and that the values are ranked from [0-5]
if length(a) == 6 && all(a >= 0 & a <= 5);
    % Now determine the input variables by limiting the input to the
    % greatest three AIS scores in matrix a
    max_num = maxk(a,3);
    % Follow the ISS formula and square the three greatest values
    squared_num = max_num.^2;
    % Sum the array to calculate ISS score
    score = sum(squared_num);
    
else 
    % Display the message that the score is unable to be calculated if the
    % conditions were not met
    disp("Value(s) are not within the range [0-5]; please try again");
    % End the statement 
end
% End the function
end

Answer 1

[Walter Roberson]

That code would be an error if the file the script is stored in is named the same thing as the function defined in the script, compute_iss_score.m . When you define a function inside a script, the function name must be different than the script name.

Note that you define the function but you never call the function.

Also: in the case where length(a) == 6 && all(a >= 0 & a <= 5) is false, you are not setting the score variable and you are also not using error() . The code would only work for that case if the function was invoked in a context that did not expect any output variables.