Question: what does t do in this matlab code ( what is its purpose and what happens when it is changed? ) clc clear all t

what does t do in this matlab code(what is its purpose and what happens when it is changed?)
clc
clear all
t=-7:0.01:7;
x=16*(power(sin(t),3));
y=(13*cos(t))-(5*cos(2*t))-(2*cos(3*t))-(cos(4*t));
plot(x,y)

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