Ploting same y axis with two colors

Assuming there is matrix 10x2, which is called HW. First collumn values will be the X axis. Second collumn is [1,4,5,7,2,24,8,9,18,11] and will be in Y axis. In the plot, higher y values than average will be in different color than lower y values. I wrote this code which does not work due to numbers does not match and I am unable to find a proper plot function. I cannot use programming (such as: if statements). By the way X also randomly distributed.

I need them in one line. Such as from 1 to 2 (first 5 element) line is red than to 6th element, 24, blue and goes like this (r,b,r,b)

HWT = find(HW(:,1)>=mean(HW(:,1)))
HWS = find(HW(:,1)<=mean(HW(:,1)))
plot(HW(:,1),HW(HWT,2),"Color","r",HW(HWS,2),"Color","b")

Is there any plot function to solve this.

Thank you for your help.

Answer 1

[Dyuman Joshi]

HW = [rand(10,1) [1;4;5;7;2;24;8;9;18;11]];

%Mean value
m = mean(HW(:,2));

%Comparison with mean
idx1 = HW(:,2) >= m;
idx2 = ~idx1;

%Use the indices to plot the corresponding values
plot(HW(idx1,1), HW(idx1,2), 'r', HW(idx2,1), HW(idx2,2), 'b')
%Showing the average value
yline(m, 'k')

[Gökberk Kaya]

Thank you first of all,

But I need them in one line. Such as from 1 to 2 (first 5 element) line is red than blue to, 6th element, 24 and goes like this (r,b,r,b)

[Dyuman Joshi]

In that case, what should be the color of the line joining adjacent values which are on the different side of the mean?

E.g. - 5th element i.e. 2 is lower than the mean, and 6th element i.e 24 is higher than the mean. What should be the color of the line connecting these two points?

Simiarly for 24 and 8 as well.

[Gökberk Kaya]

If it is going to pass the mean, the destination's color will be the line's color. For an example, for 2 to 24, 24 is the destination therefore line will be blue but for the 24 to 8 case, 8 is the destination, so red.

[Dyuman Joshi]

Coloring the plot according to the value of the point compared to mean.

I hope you can use a for loop.

HW = [rand(10,1) [1;4;5;7;2;24;8;9;18;11]];

s = size(HW,1);
m = mean(HW(:,2));
color = ['rb'];

figure
hold on

for k=1:s-1
    %Using indexing to assign color according to the comparison
    idx = (HW(k+1,2)>m) + 1;
    plot([k k+1], HW(k:k+1,2), color(idx));
end
hold off
yline(m)

[Dyuman Joshi]

Any updates, @Gökberk Kaya?

[Gökberk Kaya]

Yes, Thank you for your help.

[Dyuman Joshi]

You are welcome :)

Answer 2

[Walter Roberson]

See https://www.mathworks.com/matlabcentral/fileexchange/19476-colored-line-or-scatter-plot or https://www.mathworks.com/matlabcentral/fileexchange/26692-color_line or https://www.mathworks.com/matlabcentral/fileexchange/23566-3d-colored-line-plot or https://www.mathworks.com/matlabcentral/fileexchange/30423-conditionally-colored-line-plot?s_tid=prof_contriblnk

[Gökberk Kaya]

thank you a lot