Question

matlab中怎么用M文件定义分段函数,再用fplot进行函数作图

函数是:y(x)=2x (0<=x<=1/2) y(x)=2(1-x) (1/2<x<=1)

Answer 1

function [y]=f(x)
x=0:0.1:1;
if x<=1/2
y=2*x;

else
y=2*(1-x)
end

fplot('2*x,2*(1-x)',[0,1/2],(1/2,1])

Answer 2

fun3 = @(x)exp(x);
fplot(fun3,[-3,0],'m')
hold on
fun4 = @(x)cos(x);
fplot(fun4,[0,3],'r')
用hold on