How to set the color in a for loop for a plot within the for loop with an if statement?

Hi all,

I have the following code but I don't like it. What I want is that we plot the entire t,e but set MarkerFaceColor of each point in the 50 x 50 plot based on the if statements. How should I get that done? when I add the set argument, it does not work at all and only plots a point at 50,50.

   for t = 1:50
        for e = 1:50
            if ismember(t,1:0.01:4.99) & ismember(e,1:0.01:4.99)
           plot(t,e,'ok','MarkerFaceColor','k')
           hold on 
            elseif ismember(t,5:0.01:50) & ismember(e,5:0.01:50) 
            plot(t,e,'or','MarkerFaceColor','r')
           hold on 
            end
        end

Answer 1

[Veronica Taurino]

I don't get very well what you are asking for. You need to color t between 1 and 5 AND e between 1 and 5 in black, otherwise t between 5 (included) and 50 AND e between 5 (included) and 50 in red. With you code, I get this:

What is it wrong according to your needs?

Do you need something like this?

% random entries
t= (50)*rand(50,1);
e= (50)*rand(50,1);

figure
hold on
plot(t,e,'og') % plot all together, just to check if you miss something

for ii = 1:50
            if (t(ii)>=1 && t(ii)< 5) && (e(ii)>=1 && e(ii)< 5)
               plot(t(ii),e(ii),'.k','MarkerFaceColor','k') %here I used . instead of o, just to check if points fall within the green ones
            elseif (t(ii)>=5 && t(ii)<= 50) && (e(ii)>=5 && e(ii)<= 50)
               plot(t(ii),e(ii),'.r','MarkerFaceColor','r')
            end
end

this is the output (just one point respects the first condition and it is black).

[Wolfgang McCormack]

Yes, exacly! Thank you!

[Wolfgang McCormack]

@Veronica Taurino sorry quick question, how can I create some white space between the start of the axis on both x and y and on the end as well. Also, is it possible to show the values on each dot?

Thanks in advance. I really appreciate it.

[Veronica Taurino]

To show the labels/values, you need sometyhing like:

text(t,e,strcat('(',num2str(t),',',num2str(e,2),')'),...
     'horiz','center','vert','bottom')

Here to adjust your plot: Add text descriptions to data points - MATLAB text - MathWorks Italia

I didn't get your first question.