知道y的值,怎么标注出对应x值所对应曲线的坐标啊;matlab答:clear;clc;x=linspace(0,15,16);y=25*x;y1=0.2*0.0045*x.^5-0.25*0.1517*x.^4+1.7807/3*x.^3-0.5*8.3483*x.^2+29.2147*x;L=(y-y1)*6.5/3;plot(x,L);hold on;x160=interp1(L,x,160);plot(x160,160,'r.');text(x160,160,sprintf(' (%g, %g)',x160,160)...
用matlab,已知x的值,和f(x,y)=0的隐函数,如何求y答:,[-2.23,2.23 0 1]);x1=get(h,'XData');y1=get(h,'YData');x=linspace(-2.23,2.23,100);y=interp1(x1,y1,x);hold on plot(x,y,'r')使用ezplot函数来实现吧。先画出图像,然后图像上取点进行插值。当然这样可能不够精确。要想更精确就给定一个x,然后只用数值方法求y。