function input arguments error
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not sure how to solve this issue with function arguments,
I'm trying to do this to figure out how to return a vector y that contains both solutions: a logical variable isreal indicating whether the results were real (isreal=1) or imaginary (isreal=0). not sure if it would be the right approach.
Any help will be appreciated, thank you
myquad
Not enough input arguments.
Error in myquad (line 3)
D = b^2 - 4*a*c;
^
function [y, isreal] = myquad(a, b, c)
% Calculate the discriminant
D = b^2 - 4*a*c;
% Calculate the two solutions using the quadratic formula
y(1) = (-b + sqrt(D)) / (2*a);
y(2) = (-b - sqrt(D)) / (2*a);
% Check if the solutions are real
isreal = all(isreal(y));
% If the discriminant is negative, the solutions are complex
if D < 0
y = [NaN, NaN]; % Return NaN for complex solutions
isreal = 0; % Set isreal to false
end
end
%In the command window I'm trying to call the function like this;
y = myquad(1, -2, 1);
disp(y); % Output: [1, 1]
disp(isreal); % Output: 1
1 个评论
采纳的回答
Don't use isreal as a variable name: isreal is a MATLAB function that you overwrite this way.
[y, is_real] = myquad(1, -2, 1);
disp(y); % Output: [1, 1]
disp(is_real); % Output: 1
function [y, is_real] = myquad(a, b, c)
D = b^2 - 4*a*c;
if D >=0
is_real = true;
y = [(-b + sqrt(D)) / (2*a),(-b - sqrt(D)) / (2*a)];
else
is_real = false;
y = [NaN, NaN];
end
end
4 个评论
Cesar Cardenas
2025-8-29
@Cesar Cardenas Torsten and I have both run our code for you so you can see how the function is called and that they produce the proper output. Please run your code for us online, so that we can all see it in action.
Cesar Cardenas
2025-8-29
Cesar Cardenas
2025-8-29
更多回答（1 个）
Your code uses 'isreal' as both the name of a function and a variable. You can resolve the conflict by renaming the output, e.g.,
[y,isReal] = myquad(1, -2, 1)
function [y, isReal] = myquad(a, b, c)
% Calculate the discriminant
D = sqrt(b^2 - 4*a*c);
isReal=isreal(D);
if ~isReal, y=nan(1,2); return; end
% Calculate the two solutions using the quadratic formula
y = (-b + [-1,1]*D) / (2*a);
end
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