请教如何用向量来表达呢？
v=5;R=0.5;
c1=-1;
c2=0;
c3=1;
c4=2;
m=1;
for b=0:0.001:pi
r1(m)=(((c1/(v*sin(b)))^2+4*(R^2))^0.5+c1/(v*sin(b)))/2;
x1(m)=r1(m)*cos(b);
y1(m)=r1(m)*sin(b);
r2(m)=(((c2/(v*sin(b)))^2+4*R^2)^0.5+c2/(v*sin(b)))/2;
x2(m)=r2(m)*cos(b);
y2(m)=r2(m)*sin(b);
r3(m)=(((c3/(v*sin(b)))^2+4*R^2)^0.5+c3/(v*sin(b)))/2;
x3(m)=r3(m)*cos(b);
y3(m)=r3(m)*sin(b);
r4(m)=(((c4/(v*sin(b)))^2+4*R^2)^0.5+c4/(v*sin(b)))/2;
x4(m)=r4(m)*cos(b);
y4(m)=r4(m)*sin(b);
m=m+1;
end
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