How do I edit the legend when I have *many* entries (but only 2 types of data)

Hello Community,

I have a presentation problem regarding a plot legend that I hope you can help with. This situation is that I plot a bar chart and need to identify a single bar with a different colour when the data hits certain conditions, coded as:

% raise figure
figure(1)
hold on

% set color bar
cm = [0.90 0.90 0.90; 0 0 0]; 

% run for loop to colour data individually & when data conditions are met
for i = 1:length(pltvar1srt)
    h=bar(i,pltvar1srt(i));
    if pltvar1srt(i) == 1.71 && 4
        set(h,'FaceColor',cm(1,:));
    else
        set(h,'FaceColor',cm(2,:));
    end
end
hold off

and this produces the plot I need:

The problem is when I add the legend, due to the way I have coloured the bar, I get many data entries:

Using the legend help, I have tried to write the legend using a variety of calls - all of which haven't worked unfortunately:

legend ([data1 data10]);
legend ([data data10]);
legend ([pltvar1srt.9 pltvar1srt.10]);
legend ([pltvar1srt(9) pltvar1srt(10)]);
legend ([cm(1,:) cm(2,:)], 'Data 1', 'Data 2');

% etc. etc.

but still no luck. I have also looked at this useful function - but again, couldn't get it to work in the way I needed.

I simply want the legend to have the two entries ie 'Black Data' and 'Grey Data' and be coloured appropriately.

Can anyone offer any help please?

Many thanks,

10B.

[10B]

Reading through various examples, I starting to think that 'hggroup' may be part of the solution, similar to the example here, the drawback is that I am not creating the plot in the same way.

I'm still working on this - but would be grateful of some help if possible!

Answer 1

[Thorsten]

    if pltvar1srt(i) == 1.71 && 4
        set(h,'FaceColor',cm(1,:));
        hlegend(1) = h;
    else
        set(h,'FaceColor',cm(2,:));
        hlegend(2) = h;
    end

and then

legend(hlegend, {'Data 1' 'Data 2'})

[10B]

Ah! Of course - Many thanks Thorsten.

I had experimented with:

h=set(h,'FaceColor',cm(1,:)); etc.

at one point which obviously didn't work, but I was sort of along the right track, so thanks for helping me out.

You never know, in just 5 or 6 more years of this pain, I may just learn to master the basics...

Answer 2

[Sharad Singhania]

You can also do it from plot editor.

Go to plot editor > Property editor -Legend > more properties... > string > click on array icon> modify as per your requirement.