How can I stop part of my plot?

Hello,

I am a MATLAB noob and I need your help.

I have a college task to make this: ,

and instead of that so far I got this:

This is the code I am using:

% initial values
a = 0.2;
b = 0.2;
c = 0.4;
K = 40;
L = 70;
 
xos = 0:5:70; 
yos = 0:5:80; 
[x,y] = meshgrid(xos,yos);
u = a*x.*(1-(x/K));
v = b*y.*(1-(y./(L-c*x)));
hold on

y = yos;
x = K*ones(size(y));
hold on
plot(x,y) 

x = xos;
y = L-c*x;
hold on
plot (x,y)

startx1 = 15;
starty1 = 30;
redLine = streamline(xos,yos,u,v,startx1, starty1);
set(redLine,'Color','red')

startx2 = 60;
starty2 = 20;
blueLine = streamline(xos,yos,u,v,startx2,starty2);
set(blueLine,'Color','blue')

startx3 = 60;
starty3 = 60;
greenLine = streamline(xos,yos,u,v,startx3,starty3);
set(greenLine,'Color','green')

startx4 = 15;
starty4 = 80;
cyanLine = streamline(xos,yos,u,v,startx4,starty4);
set(cyanLine,'Color','cyan')

Thank you for your time and help.

[KALYAN ACHARJYA]

What does it mean "MATLAB noob"?

[Adam Danz]

noob = newbie (novice)

[Adam Danz]

Is the assignment to create a plot using streamline() and then to remove some sections from each line? That sounds odd. Using your code and changing as little as possible, one way would be to replace some of the (X,Y) coordinates of a line with NaN values.

Here's an example to execute after all of the lines in your example.

cyanLine.YData(30:end) = NaN;  %replace y coordates from 30 to 223 with NaNs

[Matea Sibalic]

Thank you! Your answer was really helpful. Streamline was not required for this assignment; the only thing I needed was working code which will show graph as it is on image I posted.