From which elementary functions does the below signal composed of and how can I compose it in the final variable

step=0.01;

t = .......
    %here wrte the function that the signal consists of
xt = 
yt = 
%here compose the final signal.
final = 
%print the signal
figure(1)
plot(t,final,'LineWidth',5)
hold on; grid on;
xticks(-10:1:10);