I am doing this assignment for school and I keep getting a specific error even though my code works properly.

% Please enter your name inside the single quotes in the next line
name = 'Segesman Francis'; % Last Name, First Name
syms t1 x1 vy1;         % Unknowns       
assume(x1>0);           % Eliminate the negative value of the double solution
assume(t1>0);
syms t x vy y;          % Variables of integration
% Given
v0 = 100;               % [ft/s]
theta = 60*pi/180;      % [rad] Keep in mind that we will use the angle with cos rather than cosd 
vx = v0*cos(theta);     % Note the difference between cos and cosd.
t0 = 0;
x0 = 0;
ay = -32.2;             % [ft/s^2]
y0 = 0;
vy0 = v0*sin(theta);
y1 = -0.001*x1^2;       
% Solve
eqn1 = int(vx,t,t0,t1) == int(1,x,x0,x1);
eqn2 = int(ay,t,t0,t1) == int(1,vy,vy0,vy1);                % Complete this line to define the second equation
eqn3 = int(ay,y,y0,y1) == int(vy,vy,vy0,vy1);                % Pay attention to the integrand or the function to be integrated on the right-hand side.
[x1 t1 vy1] = solve([eqn1 eqn2 eqn3], [x1, t1, vy1]);

% If you have trouble completing the previous line, check out WK1MATLAB1 which is to solve a system of two equations.
% Display
disp('You should get: The x coordinate of the point of impact is 318.39 ft.');

You should get: The x coordinate of the point of impact is 318.39 ft.

fprintf('The x coordinate of the point of impact is %3.2f ft.\n',x1);

The x coordinate of the point of impact is 318.39 ft.

disp('You should get: The x coordinate of the point of impact is 318 ft.');

You should get: The x coordinate of the point of impact is 318 ft.

fprintf('The x coordinate of the point of impact is %.3g ft.\n',x1);

The x coordinate of the point of impact is 318 ft.

fprintf('\n');
disp ('Can you tell the difference between %f and %g?');

Can you tell the difference between %f and %g?

fprintf('\n');
nameInfo = isempty(name);
if (nameInfo==1) 
    disp('Please enter your name in Line 2.'); 
end;   




%whenever I run this, i get this error: Variable x1 must be of size [1 1]. It is currently of size [0 1]. Check where the variable is assigned a value
% the program works, I am getting the correct numbers, but it looks like
% something about how the number is being stored is off.

[Image Analyst]

I don't have the Symbolic Toolbox so I can't run it, but why don't you include the whole error message -- ALL the red text, which includes

1. the actual line of code that threw the error,
2. the line number,
3. the error description,
4. etc.

[Francis Segesman]

i did, It is outputting the right number but complaining that it isnt in the correct format, all it gives me is:

Variable x1 must be of size [1 1]. It is currently of size [0 1]. Check where the variable is assigned a value.

and nothing else. it does all of the math right, just outputs that I think there may be something wrong with how it is being checked

[Cris LaPierre]

I ran your code in your original post (you can now see outputs inline with the code). There was no error message.