Matlab - Problemas de matlab

clear all

i=1;

x(1)=0;

y(1)=0;

while x(i)<=10

    if x(i)>0

        u1=-5/6*(x(i)-0)^4;

    else

        u1=0;

    end

   if x(i)>5

        u2=5/6*(x(i)-5)^4;

   else

       u2=0;

   end

    if x(i)>8

        u3=15/6*(x(i)-8)^3;

    else

        u3=0;

    end

   if x(i)>7

        u4=75*(x(i)-7)^2;

   else

       u4=0;

   end

     u5=57/6*x(i)^3-238.25*x(i);

     y(i+1)=u1+u2+u3+u4+u5;

     x(i+1)=0.1+x(i);

     i=i+1;

end

plot(x,y)

>>vigas22