How to define subscripts in complex function which takes differ values at differ positions?

n1=3.2;n3=3.2;n5=3.2; n2=3.3;n4=3.3;d2=1;d4=1; lambda=1.5; K=2*pi/lambda; j=1:5; kj=sqrt(nj^2*K^2-beta^2);j=2,4; Gammaj=sqrt(beta^2-nj^2*K^2);j=1,3,5;