請位各位專家，我想畫附檔的圖片，搞了下面這程式但無法執行，請問哪裡出錯呢?
n=-8:0.2:8; %(Greek letter eta)

for ind=1:length(n)
    if n(ind)>=-8

        Fermi(ind)=((-1)/2)*sqrt(pi)*(polylog(3/2,exp((-1)*(n(ind))));
    end
end

Ref2=semilogy(n,Fermi,'r','LineWidth',2,'LineStyle','--');
set(Ref2,'DisplayName','Ref 2');