Question

怎么用matlab做y=x^5+x^4-7x^3+-0.75x^2+4x-8的图像，求高手帮忙，要详细点

x=0:7;y=(x-0.5)*(x+0.9)*(x-0.654)+(x-0.23)*(x-0.89)+(x-0.45)+7 这一个应该怎么做？ 我这样写 x=0:7;y=(x-0.5)*(x+0.9)*(x-0.654)+(x-0.23)*(x-0.89)+(x-0.45)+6;plot(x,y) 出现了??? Error using ==> mtimes nner matrix dimensions must agree.的问题 怎么解决

Answer 1

clear all;
y=@(x)x.^5+x.^4-7*x.^3+-0.75*x.^2+4*x-8;
ezplot(y);grid on;
或者：
clear all;
x=-5:0.1:5;
y=x.^5+x.^4-7*x.^3+-0.75*x.^2+4*x-8;
plot(x,y);grid on;
-------------------
clear all;
x=0:0.1:7;
y=(x-0.5).*(x+0.9).*(x-0.654)+(x-0.23).*(x-0.89)+(x-0.45)+6;
plot(x,y);grid on;

追问

x=0:7;y=(x-0.5)*(x+0.9)*(x-0.654)+(x-0.23)*(x-0.89)+(x-0.45)+7 这一个应该怎么做？ 我这样写 x=0:7;y=(x-0.5)*(x+0.9)*(x-0.654)+(x-0.23)*(x-0.89)+(x-0.45)+6;plot(x,y) 出现了??? Error using ==> mtimes nner matrix dimensions must agree.的问题 怎么解决

追答

clear all;
x=0:0.1:7;
y=(x-0.5).*(x+0.9).*(x-0.654)+(x-0.23).*(x-0.89)+(x-0.45)+6;
plot(x,y);grid on;