9楼: Originally posted by dbb627 at 2011-12-01 10:37:16:
分段函数有很简单的写法，不用那么复杂
y=-exp(10.5*(x+0.5)) x<-0.5
y =exp(3.51*(x0.5))-2*exp(-3.51*(x+0.5))   (-0.5,0.5)
y=-exp(10.5*(x+0.5))    x>0.5

[code]
x=-1:0.02:1;
y=-exp(10.5 ...

2楼: Originally posted by dbb627 at 2011-11-30 22:48:21:
命令窗口输入
fplot(@objfun,[-10 10])
或者
把函数改保存
Function y=objfun(x)

y=x.^2+5*x+20;

然后在命令窗口输入
x=-10:0.1:10;
plot(x,objfun(x))
[ Last edited by dbb627 on 2011-11-30 at ...