Writing code to call functions

Given:

Find: Create a function that calculates the surface area of a sphere when provided with a radius as the input argument. Your code should work for both scalar radius values or an array of radii.

My Solution:

function A = AreaSphere(radius)
A=4*pi.*r^2
end

Code to call your function

r=randi(10,3,1);
Area=AreaSphere(r)

My Issue: I don't think I've learned how to properly call functions because I keep getting errors when trying to run function.

Answer 1

[Stephen23]

"I don't think I've learned how to properly call functions because I keep getting errors when trying to run function."

The problem is how you have written the function: you defined one input argument RADIUS which you did not use anywhere. And then inside the function you refer to a variable/function named R which you did not define anywhere.

You also need to use array operations for element-wise operations:

https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html

r=randi(10,3,1);
Area = AreaSphere(r)

Area = 3×1

50.2655 201.0619 314.1593

function A = AreaSphere(radius)
A = 4*pi.*radius.^2;
end %     ^^^^^^^^ 

[Spaceman]

Genius. I understand the error of my ways now. I was getting confused on how to define and call what I had defined.