Plotting data set in for loop

I have bee trying to plot two data set according to their efficiency. If efficiency is greater than .8 the set should be plotted in red or if it less that .8 the data set should be plotted in blue. I am having trouble related the effeminacy with the appropriate data set to plot it. how would i do this, with out hard coding the date set. Efficiency is 'n'

D=[1 2 3 4;2 5 7 5;2 6 7 9;2 4 8 4];
n1= (D(2,:)/D(1,:));
n2 = D(4,:)/D(3,:);

V =[n1 n2];

%plot
figure('color','white');
axis([0 12 0 10]);
xlabel('Energy Input (E1) [MJ]');
ylabel('Kinectic Energy (E0) [MJ]');
title('Efficiency Analysis of Spacecraft Engines','FontSize',20);
grid

for x = min(V):max(V)
    if x> 0.80
       hold on 
    elseif x< 0.8
        hold on
    end
end

[KSSV]

What you are plotting? Are you plotting points in a loop?

[Stephanie Velasco]

yes i

D=[1 2 3 4;2 5 7 5;2 6 7 9;2 4 8 4]; 
n1= (D(2,:)/D(1,:)); 
n2 = D(4,:)/D(3,:);

V =[n1 n2];

for x = min(V):max(V) 
if x> 0.80 
elseif x< 0.8 
end end

[Walter Roberson]

You do not show any plot calls.

[Stephanie Velasco]

I have the plot before actually going in to the loop,i just didn't show it but its.

%plot
figure('color','white');
axis([0 12 0 10]);
xlabel('Energy Input (E1) [MJ]');
ylabel('Kinectic Energy (E0) [MJ]');
title('Efficiency Analysis of Spacecraft Engines','FontSize',20);
grid

[Walter Roberson]

No plot calls there. You do not have any line() or plot() or surf() or surface() or patch() or hist() or anything else that actually plots.