使用matlab或者mathematica?

本人利用matlab解分段函数 :
syms factor1 factor2 factor3 x
if t>=0
       if t<3
            factor1=1; factor2=0; factor3=0;
        elseif t<4
             factor1=0; factor2=1; factor3=0;
         elseif t<6
              factor1=0; factor2=0; factor3=1;
        end
    end
y=factor1*sin(x)+factor2*x+factor3*sin(2*x)
OVER
祝您早日成位编程高手!