Plotting two functions with ranges in one plot

Hello, I have trouble finding out how to put seperate ranges on my plot.

As of right now this is my code:

x=[0: 1: 6] 
M1=9.*x-3.*x.^2
M2=-1.*(3.*(6-x).^2);

figure
plot(x, M1, x, M2)
grid

The first function's (M1) variable "x" should have ranges from 0 to 4 (x >= 0 and x < 4)

The second function's (M2) variable "x" should have ranges from 4 to 6 (x >= 4 and x < 6)

Anyways I need my plot to look like this:

[Catalytic]

If you don't know how to generate "This", how did you obtain the left-hand plot above?

[Wouter Eppink]

The eraser tool from an amazing piece of software called ms paint.

Answer 1

[Matt J]

x1=0:4;
x2=4:6;
M1=9.*x1-3.*x1.^2;
M2=-1.*(3.*(6-x2).^2);
figure
plot(x1, M1, x2, M2);
ylim([-120,20]);
grid

Answer 2

[Catalytic]

You could also edit away the data points you don't want

  h=plot(x, M1, x, M2); ylim([-120,20]);
  
  h(1).XData(6:7)=[];  h(1).YData(6:7)=[];
  h(2).XData(1:4)=[];  h(2).YData(1:4)=[];

Answer 3

[Wouter Eppink]

However the awnser works fine for now. However when I'm putting more than two functions in one graph this way, I'd like to find a way to incorporate the range into the function in order to decrease the amount of extra variables

[Matt J]

Which of the 2 answers are you referring to?