MATLAB plot error Warning: Rank deficient,

[poster]

beginner here, just asking my first question so Bear with me, im trying to plot this simple code but no matter what I try it won't plot it instead I get a blank window and rank deficient warning, what I'm doing wrong? :
x= linspace(0,2*pi,1000);
y=abs(sin(x.^x)/2.^(x.^(x)-pi/2)/pi);
plot(x,y)

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