我将code修改成下面就没问题了
#########################################################
# Perform the far field projection and image result
m="monitor"; # Monitor name
res = 500; # projection resolution
E2 = farfield3d(m,1,res,res,1,1,1,1.33);# this returns |E|^2 in the far field
ux = farfieldux(m,1,res,res);
uy = farfielduy(m,1,res,res);
image(ux,uy,E2,"","","|E|^2 at 1 m","polar");