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+//Example No. 6.14.1

+clc;

+clear;

+close;

+format('v',6);

+SLL=19.1;//dB(Side Lobe Level)

+//d=lambda/2;(spacing)

+dBYlambda=1/2;//(Spacing/wavelength)

+n=4;//(no. of elements)

+r=round(10^(SLL/20));//(ratio of main lobe to side lobe)

+m=n-1;//(degree )

+//T3(x0)=r=4*x0^3-3*x0;

+x0=roots([4 0 -3 -r]);//(Coefficient)

+x0=x0(1);//taking real value(Coefficient)

+//E4(z)=T3(x)=4*x^3-3*x=4*a1*z^3-3*a1*z+a0*z

+//4*a1*z^3=4*x^3 where z^3=(x/x0)^3

+a1=4*x0^3/4;//(Coefficient)

+//a0*z-3*z*a1=-3*x

+a0=(3/x0*a1-3)*x0;//(Coefficient)

+disp(a0,a1,"Coefficients of array polynomial a1 & a0 are : ");

+disp(a0/a1,a1/a1,"Relative current amplitudes are :");