MATLAB: Error Message: “Error: Function definitions are not permitted in this context.” How to fix this

Question

Hello, This is the function I have created function [R] = HydraulicRadius(W)

% ........
for D = 0.5:0.01:1.1
R=(W*D)/(W+2*D);
end
end

This is my input in the command window.

>> W=112.78; 
>> function [R] = HydraulicRadius(W)

This is the output I get

??? function [R] = HydraulicRadius(W) 
      |
Error: Function definitions are not permitted in this context.

I'm not really sure why I am getting this error message. Any help would be greatly appreciated!

Answer 1

When you define a function in a file - you use the

function [R] = HydraulicRadius(W)

when you call it to use it, you do not use the word function as that is used for definition (aka your error message).

Call it like this:

R = HydraulicRadius(W)

(Note, you probably don't need the [], in the function definition)