how do I fill between 3 lines?

b = 48

b = 48

time = 0:1:40000;
mFast = 6/30 

mFast = 0.2000

mSlow = 4.3/30

mSlow = 0.1433

yFast = (mFast*time)+b

yFast = 1×40001

48.0000 48.2000 48.4000 48.6000 48.8000 49.0000 49.2000 49.4000 49.6000 49.8000 50.0000 50.2000 50.4000 50.6000 50.8000 51.0000 51.2000 51.4000 51.6000 51.8000 52.0000 52.2000 52.4000 52.6000 52.8000 53.0000 53.2000 53.4000 53.6000 53.8000

ySlow = (mSlow*time)+b

ySlow = 1×40001

48.0000 48.1433 48.2867 48.4300 48.5733 48.7167 48.8600 49.0033 49.1467 49.2900 49.4333 49.5767 49.7200 49.8633 50.0067 50.1500 50.2933 50.4367 50.5800 50.7233 50.8667 51.0100 51.1533 51.2967 51.4400 51.5833 51.7267 51.8700 52.0133 52.1567

plot(time,yFast);
xlabel("Time(Minutes)")
ylabel("growth in numbers")
title("Tribble Growth Rate")
legend("Harvester")
hold on
plot(time,ySlow,"DisplayName","Triple Triticale ")
ycutoff=time * 0 +5000

ycutoff = 1×40001

5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000

plot(time,ycutoff)

%i need to fill between the 3 lines thats given and need some help%

[Walter Roberson]

I would recommend first calculating the points of intersection between the lines and ycuttoff . Doing so would allow you to calculate the coordinates of the 3 vertices of the triangle, and then you can fill using the coordinates.

Answer 1

[Matt J]

One way:

b = 48;
time = 0:1:40000;
mFast = 6/30 ;
mSlow = 4.3/30;

yFast = (mFast*time)+b;
ySlow = (mSlow*time)+b;
plot(time,yFast);
xlabel("Time(Minutes)")
ylabel("growth in numbers")
title("Tribble Growth Rate")
L=legend("Harvester");
hold on
plot(time,ySlow,"DisplayName","Triple Triticale ")
ycutoff=time * 0 +5000;
plot(time,ycutoff)
L.AutoUpdate='off';


V=[0 0
   roots([mSlow,b-ycutoff(1)])  ycutoff(1)
   roots([mFast,b-ycutoff(1)])  ycutoff(1)];

hold on
plot(polyshape(V),'FaceColor','g')
hold off