rectang - create a rectangular aperture object.
create a rectangular aperture object. notice: it is't diffrent to rect_ap, because it does not include the process to filter the field.
number=256; wavelength=1e-6; pixscl=0.1;sz=number*pixscl; dwf=begin(sz,wavelength); ap=rectang(sz/2,sz/2); dwf=aperture_transform(dwf,ap); dwf_fits(dwf,"rect_ap");
Chen jingyuan, Gan guangyong (IAPCM, Beijing,China.)
rect_ap , rect_screen , circle , annul_ap , hex_ap , spid_annul_ap , til_hex_ap , aperture_transform , aperture ,