Hi please help I can't run my code it says not enough input arguments line 3

% (i) pipe_velocity(): calculating the water velocity v (m/s) of a given pipe diameter d (mm) and flow rate Q (/s).
function v = pipe_velocity(d, Q)
    A = pi * (d / 1000)^2 / 4; % Cross-sectional area (m^2)
    v = Q / A; % Velocity (m/s)
end

[Torsten]

Without calling the function with numerical inputs for d and Q, what result do you expect ?

[Walter Roberson]

When you pressed the green Run button, where do you expect matlab to look to find values for d and Q?

Answer 1

[Dongyue]

res = pipe_velocity(1,2)

res = 2.5465e+06

function v = pipe_velocity(d, Q)
    A = pi * (d / 1000)^2 / 4; % Cross-sectional area (m^2)
    v = Q / A; % Velocity (m/s)
end

You may have to call the function after defining it.

You can go through the documentaton for MATLAB Function or Anonymous Function for more instructions:

https://www.mathworks.com/help/matlab/ref/function.html

https://www.mathworks.com/help/matlab/matlab_prog/anonymous-functions.html