plot(r(3),0,'k*')中的r(3)是什么意思?clear,clca=[1,1.4,1.8,2];b=[-2,-0.8,0.4,1.2];p=polyfit(a,b,3);x=0.5:0.01:2.5;y=polyval(p,x);plot(x,y,a,b,'r*')hold onpausexlabel(1.55)y0=polyval(p,1.55)plot(1.55*ones(539),-5:0.01:0.3844,'r-')pauseplot(1.55,
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plot(r(3),0,'k*')中的r(3)是什么意思?clear,clca=[1,1.4,1.8,2];b=[-2,-0.8,0.4,1.2];p=polyfit(a,b,3);x=0.5:0.01:2.5;y=polyval(p,x);plot(x,y,a,b,'r*')hold onpausexlabel(1.55)y0=polyval(p,1.55)plot(1.55*ones(539),-5:0.01:0.3844,'r-')pauseplot(1.55,
plot(r(3),0,'k*')中的r(3)是什么意思?
clear,clc
a=[1,1.4,1.8,2];
b=[-2,-0.8,0.4,1.2];
p=polyfit(a,b,3);
x=0.5:0.01:2.5;
y=polyval(p,x);
plot(x,y,a,b,'r*')
hold on
pause
xlabel(1.55)
y0=polyval(p,1.55)
plot(1.55*ones(539),-5:0.01:0.3844,'r-')
pause
plot(1.55,y0,'k*')
plot(0.5:0.01:1.55,y0*ones(106))
ylabel(y0)
pause
plot(x,zeros(201),'k')
r=roots(p)
pause
plot(r(3),0,'k*')
pause
plot(r(3)*ones(501),-5:0.01:0,'k')
xlabel(r(3))
plot(r(3),0,'k*')中的r(3)是什么意思?clear,clca=[1,1.4,1.8,2];b=[-2,-0.8,0.4,1.2];p=polyfit(a,b,3);x=0.5:0.01:2.5;y=polyval(p,x);plot(x,y,a,b,'r*')hold onpausexlabel(1.55)y0=polyval(p,1.55)plot(1.55*ones(539),-5:0.01:0.3844,'r-')pauseplot(1.55,
答案:过了几个月,他们俩又在捐献中心碰面了,男人主动打招呼"嗨,又来献血吗?"