Create a conditional function in script

Hello,
I'm trying to create a conditional equation in Matlab. I created a simple test script below and receive errors for "Missing or extra characters". In my test, I am trying to create a simple function "fun", where fun=2*R if R>0 and fun=3*R if R<=0.
close all
clear all
clc
syms R
fun(R)=
if R>0
2*R
elseif R<=0
3*R
end
It appears my approach is just incorrect. Any help is much appreciated.
Thanks!
Josh

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