MATLAB Live editor valriables with indices

Dear all , is there any way to make rt have t as indices in this ?

clear all
syms rt r1 r2 r3
rt=r1+r2+r3

r1 , r2 , r3 have indices , but not rt , and i want to make it consistent in the equation

Answer 1

[Sarah Palfreyman]

clear all
syms r_t r1 r2 r3 k_t
r_t==r1+r2+r3

You can use subscripts & equation assignment if that helps.