How would I put this in a for loop ?

clc; clear; close all;
T=1;                 % Period
w0 = 2*pi/T;          % frequency
Vm = 1;              % Voltage amplitude

syms t; 
v1 = Vm*sin((4*pi*t)/T); 
v2= 2*Vm*sin((4*pi*t)/T); 
v = piecewise(-T<=t<=-T/2,v1,-T/2<=t<=0,v2,...
    0<=t<=T/2,v1,T/2<=t<=T,v2,...
    T<=t<=T+T/2,v1,T+T/2<=t<=2*T,v2,...
    2*T<=t<=2*T+T/2,v1,2*T+T/2<=t<=3*T,v2);

[Image Analyst]

Original question, in case dummy deletes this one too:

How would I put this in a for loop ?

clc; clear; close all;
T=1;                 % Period
w0 = 2*pi/T;          % frequency
Vm = 1;              % Voltage amplitude

syms t; 
v1 = Vm*sin((4*pi*t)/T); 
v2= 2*Vm*sin((4*pi*t)/T); 
v = piecewise(-T<=t<=-T/2,v1,-T/2<=t<=0,v2,...
    0<=t<=T/2,v1,T/2<=t<=T,v2,...
    T<=t<=T+T/2,v1,T+T/2<=t<=2*T,v2,...
    2*T<=t<=2*T+T/2,v1,2*T+T/2<=t<=3*T,v2);

Answer 1

[Andrei Bobrov]

T = 1;               % Period
Vm = 1;              % Voltage amplitude

v = {@(t)Vm*sin(4*pi*t/T); 
     @(t)2*Vm*sin(4*pi*t/T)}; 

ii = rem(discretize(rem(t,T),(-1:.5:1)')-1,2)+1;
U_out = arrayfun(@(x,y)v{x}(y),ii,t);