How do you call local functions?

Hi! I am learning about local functions and I am not sure how to use them with a script. I am trying to make a function with only one input (radius) and two outputs (surface area and volume) for a sphere. I am suppossed to test it with when the radius = pi and have the two outputs. So far I have this and I keep getting an area about matlab being out of memory due to an infinite incursion within the program.

clc
clear all

r(pi)

function radius = r(x)
    SA = 4*pi*r^.2;
    V = (4/3)*pi*r^.3;
end

[Stephen23]

There is no problem with how you are calling the local function.

However there are several basic problems with the function itself:

function radius = r(x) % you do not use variable x anywhere in your function
SA = 4*pi*r^.2; % variable r is undefined, r is a recursive function call
V = (4/3)*pi*r^.3; % variable r is undefined, r is a recursive function call
radius = ??? % You need to define the output variable
end

The main problem is that you think you are using a variable r, but in fact you are calling the function recursively.

Note that both SA and V are completely unused. I strongly recommend that you avoid using one-letter function names.

See the examples here: https://www.mathworks.com/help/matlab/ref/function.html

Answer 1

[Caroline F]

I figured it out. Thank you to everyone who responded for your help!

sphere_prop(pi) ;

function [SA,V] = sphere_prop(r)
    SA = 4*pi*r^2
    V = (4/3)*pi*r^3
end

Answer 2

[KSSV]

function radius = r(x)
    SA = 4*pi*r^.2;
    V = (4/3)*pi*r^.3;
end

Save the above function inti a file r.m. (I suggest bigger name). Go the folder where this file is present/ or addpath of the function. Now call the function.

x = 1 ;
radius = r(x) ;

Or, you can copy it in a file and run the code.

clc; clear all ;
radius = r(2) ; 

function radius = r(x)
    SA = 4*pi*r^.2;
    V = (4/3)*pi*r^.3;
end

Give different name to the function. If you name a variable with 'r' your function cannot be called.