主要是看例子和输入参数，你是指circle吧。
[hlines, hsm] = circle(h, freq, type1, value1, ..., typen, valuen, hsm)
这是和Smith表对应的。比如：
代码
clc; clear all; close all;
circle = rsmak('circle');
fnplt(circle), axis square
ellipse = fncmb(circle,[2 0;0 1]);
s45 = 1/sqrt(2);
rtellipse = fncmb(fncmb(ellipse, [s45 -s45;s45 s45]), [1;1] );
hold on, fnplt(rtellipse), hold off
quarter = fnbrk(fn2fm(circle,'rp'),1);
hold on, fnplt(quarter,3), hold off
结果
