How do I use scatter plot

How do I use scatter plot: To get the value of zsol for each case v2sol is 0.4(For example) in the following code. Thanks for the help.

    %
zspan=[0,400];
v0mat = [1 0.01 1;1 0.05 1;1 0.1 1;1 0.2 1];
zsol = {};
v1sol = {};
v2sol = {};
v3sol = {};
for k=1:size(v0mat,1)
  v0=v0mat(k,:);
  [z,v]=ode45(@rhs,zspan,v0);
  zsol{k}=z;
  v1sol{k}=v(:,1);
  v2sol{k}=v(:,2);
  v3sol{k}=v(:,3);
end
for k=1:size(v0mat,1)
    figure(1)
     plot(v2sol{k},zsol{k},'g')
     hold on 
       xlabel('Velocity,w')
       ylabel('Height, z')
      grid on     
end
function parameters=rhs(z,v)
            alpha=0.116; 
            db= 2*alpha-(v(1).*v(3))./(2*v(2).^2);
            dw= (v(3)./v(2))-(2*alpha*v(2)./v(1));
            dgmark= -(2*alpha*v(3)./v(1)); 
   parameters=[db;dw;dgmark];
  end

Answer 1

[Star Strider]

Add this, after the code you posted:

for k1 = 1:length(v2sol)
    zsol04(k1) = interp1(v2sol{k1}, zsol{k1}, 0.4)
end

figure
scatter(zsol04, ones(1,length(v2sol))*0.4, 'p')
grid

[Dereje]

It works thanks a lot!! To add last question: Do you think, is there a means to show it with like a bar?. Now the values lie in same axis.

[Star Strider]

I am not certain what you want.

See if the documentation on the bar (link) function (or related functions, linked to within or at the end of that page) will do what you want.

If they do not, please describe what you want in more detail.

[Dereje]

What I meant to say is: I have different 4 results when v2sol is 0.4 as you did it in scatter. In my code v2sol which is 0.4 is not a constant, it came from different scenarios which I wanted to show like case 1, case 2, case 3 and case 4. Therefore, in the graph I wanted to show the relation between case 1 and the first v2sol, case 2 and the second v2sol ,...

[Star Strider]

I am still not certain what you want to do.

Try this:

for k1 = 1:length(v2sol)
    zsol04(k1) = interp1(v2sol{k1}, zsol{k1}, 0.4)
end

figure
scatter(zsol04, ones(1,length(v2sol))*0.4, 'p')
grid

figure
bar((1:length(v2sol)), zsol04)
xlabel('v_{2}sol')
ylabel('zsol_4')

[Dereje]

Exactly, this is what I meant. You make my day!Thanks again.

[Star Strider]

As always, my pleasure!

Answer 2

[Walter Roberson]

       plot(v2sol{k},zsol{k},'g*')

to use the * marker

When you specify a marker to plot() but do not specify a line type such as 'g-*' for using line type '-', then plot() will only put in the markers and not the lines connecting the points.

[Dereje]

Thanks Walter!!