MATLAB: How to change the color of the markers in the legend in a scatter plot with colormap

colormaplegendmarker shapeMATLABplot

Hi all!

I am trying to create a scatter plot, in which data corresponding to three groups (distinguished by marker shapes: diamond, square and circle) is displayed.

Per group, three variables are displayed: one on the x-axis (X), one on the y-axis (Y) and one using a color with colormap (Z) (see figure).

In the legend, I want to show which marker shape correspond to which group. However, in the legend, the colors of the marker shapes are also displayed. In other words, I want the marker shapes in the legend to be the same color, for example black, since I want the legend to distinguish between the marker shapes.

Does anyone know how I can do this?

Thanks!

Bas

XGroup1=[1.82532934086820;1.76189882802566;1.86581665452423;1.84208279284533;1.94543462454121;1.88077578111331;1.76128381214026;1.97822911370926;1.97304464195403;1.93378442521392;1.82355428238068;1.95574913450611;1.79888388726231;2.03695171405617;2.07770691698359;2.03077445964580;1.70330090422324;2.04374344957203;2.11550444932665;1.66891179277113];
YGroup1=[4.19510557104997;4.27895115323819;4.17607420453055;4.23946800537198;4.16076632696035;4.28714069261889;4.41054054949624;4.36008886122562;4.40613345496737;4.47328547002883;4.58682008385437;4.53263937164527;4.80391026547792;4.59490503897125;4.66637612785156;4.72464758867533;5.05757343613950;4.80660162439147;4.86233248346601;5.34359104874761];
ZGroup1=[28.9049953393461;27.0826445749260;30.7223210097028;32.5346215859960;30.7223210097026;32.1979402837428;25.2552687164425;31.8612589814898;31.8612589814895;31.5245776792366;23.4228677638953;33.3167778792759;23.4228677638953;32.9750714829591;32.9750714829591;32.6333650866427;21.5854417172847;32.2916586903261;34.0637585141114;19.7429905766107];
XGroup2=[4.11038901821562;4.15272906858114;4.11659427612502;4.07459217273351;3.96439621809489;4.24216878019657;3.90072245952305;4.35569830297761;3.88585124287385;4.33750567095077;4.36726370327498;3.92033090640804;4.44401766265253;3.81462506598804;4.56540621414188;3.72070015391738;4.57550038476600;4.60083639767166;3.67495838631681;4.67269963059073];
YGroup2=[8.99512147900667;8.99721611074594;9.03507142816632;9.11782064376342;9.24355007384221;9.04005040023745;9.41188305651848;9.12182969677837;9.62193756367002;9.24035899304924;9.37231785937738;9.87240596905548;9.50343401151885;10.1616509156319;9.63518782193602;10.4878056145294;9.77782674558925;9.91035995982594;10.8488687742030;10.0634237425620];
ZGroup2=[25.7555670883019;28.1615447756094;23.3408575658771;23.3408575658773;20.9174162083359;30.5587906277998;18.4852430156775;30.5587906278000;16.0443379879018;32.9473046448736;32.5019810539089;13.5947011250097;34.8730314007486;13.5947011250097;34.4189759746667;11.1363324270001;34.4189759746672;33.9649205485850;8.66923189387414;33.5108651225037];
XGroup3=[5.24162075972210;5.47774939866243;5.01051063344864;5.72814162826148;5.03132688985076;5.28659758051943;4.79785379062001;5.99437514354079;5.09142872084174;5.56794369577748;4.84043403851748;5.36626806096234;5.79222946142251;4.58594195840591;5.18942798130283;4.61032942769405;4.92150358673526;5.66789902399382;5.48207836446702;5.87857831229213];
YGroup3=[24.8502764468704;24.6597050259612;25.1715040581295;24.4592054332807;25.2301708089576;24.9894977529324;25.4897892071292;24.3239805363222;25.2908036788056;24.8270706380107;25.5883831613631;25.0626090231808;24.6533564057156;25.9043976095868;25.3534710003533;25.9456661841259;25.6401886937639;24.9149473000733;25.1381634456723;24.7552738859307];
ZGroup3=[118.298676248774;121.395642524695;116.742655469718;122.936588021560;118.298676248774;121.395642524695;113.615538629416;124.472508424362;119.849671933766;124.472508424362;116.742655469718;122.936588021560;126.003403733100;112.044442568170;121.395642524695;113.615538629417;118.298676248774;126.003403733100;124.472508424362;127.529273947775];
figure
scatter(XGroup1, YGroup1, 30,  ZGroup1, 'o', 'filled', 'MarkerEdgeColor','k');
hold on
grid on
scatter(XGroup2, YGroup2, 30,  ZGroup2, 's', 'filled', 'MarkerEdgeColor','k');
scatter(XGroup3, YGroup3, 30,  ZGroup3, 'd', 'filled', 'MarkerEdgeColor','k');
h1=colorbar;
colormap(jet(10))
xlabel('X')
ylabel('Y')
ylabel(h1,'Z')
legend('Group 1', 'Group 2', 'Group 3')

Best Answer

Most of the time, using legend() together with scatter() will not give you the results you want.

The work-around is to deliberately do a few more scatter() with nan as the coordinates and with the exact combination of properties that you want to show up in the legend, recording the handles as you do this, and then pass those handles in to legend() instead of having legend() look and find the first however-many handles of graphics objects.

Related Solutions

MATLAB: How to automatically assign colors to data that’s being dynamically plotted and recycle the colors if there’s more data that needs to be plotted

So I think this might be what you're looking for. I commented out the 'i' redefinition at the very bottom and added 'figure' but to answer the coloring question I recommend using the mod (for modulus) command. If you specify

color{mod(i-1,4)+1}

the values, for i=1:8 for example, will go:

color{1}
color{2}
color{3}
color{4}
color{1}
color{2}
color{3}
color{4}

and the pattern will keep repeating for varying 'i' definitions. Here is the modified code:

AOI=[0 0 0 0 0 0 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 3 5 5 5 5 5 5 5 5 5 5 6 6 6 6 6 6 6 8 8 8 8 8 8];
row1=[35 35 35 35 36 36.5 37 35 37 35 36 37 36 35 37 34 34 35 36 36 36 37 37 37 38 38 34 34 35 35 35 35 35 35 35 35 35 36 36.5 37 35 37 36 35 37 34 34 35 36 36 36 37 37 37 38 38 34 34 35 35 35 35 35];
col1= [56 57 57 58 56 57 56 56 56 57 45 45 46 46 46 44 45 45 46 46 47 47 48 48 46 46 45 46 45 46 47 56 56 57 57 58 56 57 56 56 56 57 45 45 46 46 46 44 45 45 46 46 47 47 48 48 46 46 45 46 45 46 47];
row2=[35 35 35 35 36 36.5 37 35 37 35 36 37 36 35 37 34 34 35 36 36 36 37 37 37 38 38 34 34 35 35 35 35 35 35 35 35 35 36 36.5 37 35 37 36 35 37 34 34 35 36 36 36 37 37 37 38 38 34 34 35 35 35 35 35];
col2= [56 57 57 58 56 57 56 56 56 57 45 45 46 46 46 44 45 45 46 46 47 47 48 48 46 46 45 46 45 46 47 56 56 57 57 58 56 57 56 56 56 57 45 45 46 46 46 44 45 45 46 46 47 47 48 48 46 46 45 46 45 46 47];
row3=[35 35 35 35 36 36.5 37 35 37 35 36 37 36 35 37 34 34 35 36 36 36 37 37 37 38 38 34 34 35 35 35 35 35 35 35 35 35 36 36.5 37 35 37 36 35 37 34 34 35 36 36 36 37 37 37 38 38 34 34 35 35 35 35 35];
col3= [56 57 57 58 56 57 56 56 56 57 45 45 46 46 46 44 45 45 46 46 47 47 48 48 46 46 45 46 45 46 47 56 56 57 57 58 56 57 56 56 56 57 45 45 46 46 46 44 45 45 46 46 47 47 48 48 46 46 45 46 45 46 47];
row4=[25 25 25 25 26 26.5 27 25 27 25 26 27 26 25 27 24 24 25 26 26 26 27 27 27 28 28 24 24 25 25 25 25 25 25 25 25 25 26 26.5 27 25 27 26 25 27 24 24 25 26 26 26 27 27 27 28 28 24 24 25 25 25 25 25];
col4= [56 57 57 58 56 57 56 56 56 57 45 45 46 46 46 44 45 45 46 46 47 47 48 48 46 46 45 46 45 46 47 56 56 57 57 58 56 57 56 56 56 57 45 45 46 46 46 44 45 45 46 46 47 47 48 48 46 46 45 46 45 46 47];
row5=[35 35 35 35 36 36.5 37 35 37 35 36 37 36 35 37 34 34 35 36 36 36 37 37 37 38 38 34 34 35 35 35 35 35 35 35 35 35 36 36.5 37 35 37 36 35 37 34 34 35 36 36 36 37 37 37 38 38 34 34 35 35 35 35 35];
col5= [66 67 67 68 66 67 66 66 66 67 65 65 66 66 66 64 65 65 66 66 67 67 68 68 66 66 65 66 65 66 67 66 66 67 67 68 66 67 66 66 66 67 65 65 66 66 66 64 65 65 66 66 67 67 68 68 66 66 65 66 65 66 67];
row6=[35 35 35 35 36 36.5 37 35 37 35 36 37 36 35 37 34 34 35 36 36 36 37 37 37 38 38 34 34 35 35 35 35 35 35 35 35 35 36 36.5 37 35 37 36 35 37 34 34 35 36 36 36 37 37 37 38 38 34 34 35 35 35 35 35];
col6= [56 57 57 58 56 57 56 56 56 57 45 45 46 46 46 44 45 45 46 46 47 47 48 48 46 46 45 46 45 46 47 56 56 57 57 58 56 57 56 56 56 57 45 45 46 46 46 44 45 45 46 46 47 47 48 48 46 46 45 46 45 46 47];
row7=[35 35 35 35 36 36.5 37 35 37 35 36 37 36 35 37 34 34 35 36 36 36 37 37 37 38 38 34 34 35 35 35 35 35 35 35 35 35 36 36.5 37 35 37 36 35 37 34 34 35 36 36 36 37 37 37 38 38 34 34 35 35 35 35 35];
col7= [56 57 57 58 56 57 56 56 56 57 45 45 46 46 46 44 45 45 46 46 47 47 48 48 46 46 45 46 45 46 47 56 56 57 57 58 56 57 56 56 56 57 45 45 46 46 46 44 45 45 46 46 47 47 48 48 46 46 45 46 45 46 47];
row8=[2:2:126];
col8= [56 57 57 58 56 57 56 56 56 57 45 45 46 46 46 44 45 45 46 46 47 47 48 48 46 46 45 46 45 46 47 56 56 57 57 58 56 57 56 56 56 57 45 45 46 46 46 44 45 45 46 46 47 47 48 48 46 46 45 46 45 46 47];
coord=[2:2:126];
times=[1:63];
AOI_unique=unique(AOI);
num_AOI=length(AOI_unique);
colors={'r' 'g' 'b' 'c' };
%while num_AOI>length(colors)
figure
hplt=plot(times,coord, 'DisplayName', 'coord\_pos\_sibs\_xfpi');
        hold on
        hleg=legend('-DynamicLegend');
        set(hleg, 'FontSize',10);
        grid on
        datetick('x','HH:MM:SS', 'keeplimits')
        title('Position of SIBS on FPI')
        xlim([min(times), max(times)])
        xlabel('Time (UT)');
        ylabel('Value');
        hold on
for i=1:length(AOI_unique)
    if AOI_unique(i)==1
        %%Plot







        hplt=plot(times, col1, colors{mod(i-1,4)+1}, 'DisplayName', 'column 1');
        hold on
        hplt=plot(times, row1, 'c--', 'DisplayName', 'row 1');
        hold on
        hleg=legend('-DynamicLegend');
        set(hleg, 'FontSize',10);
        grid on
    elseif AOI_unique(i)==2
        %%Plot
        hplt=plot(times, col2, colors{mod(i-1,4)+1}, 'DisplayName', 'column 2');
        hold on
        hplt=plot(times, row2, 'g--', 'DisplayName', 'row 2');
        hold on
        hleg=legend('-DynamicLegend');
        set(hleg, 'FontSize',10);
        grid on
    elseif AOI_unique(i)==3
        %%Plot
        hplt=plot(times, col3, colors{mod(i-1,4)+1}, 'DisplayName', 'column 3');
        hold on
        hplt=plot(times, row3, 'b--', 'DisplayName', 'row 3');
        hold on
        hleg=legend('-DynamicLegend');
        grid on
        elseif AOI_unique(i)==4
        %%Plot
        hplt=plot(times, col4, colors{mod(i-1,4)+1}, 'DisplayName', 'column 4');
        hold on
        hplt=plot(times, row4, 'r--', 'DisplayName', 'row 4');
        hold on
        hleg=legend('-DynamicLegend');
        set(hleg, 'FontSize',10);
        grid on
        elseif AOI_unique(i)==5
        %%Plot
        hpltA=plot(times, col5, colors{mod(i-1,4)+1}, 'DisplayName', 'column 5');
        hold on
        hplt=plot(times, row5, 'c--', 'DisplayName', 'row 5');
        hold on
        hleg=legend('-DynamicLegend');
        set(hleg, 'FontSize',10);
        grid on
        elseif AOI_unique(i)==6
        %%Plot
        hplt=plot(times, col6, colors{mod(i-1,4)+1}, 'DisplayName', 'column 6');
        hold on
        hpltA=plot(times, row6, 'g--', 'DisplayName', 'row 6');
        hold on
        hleg=legend('-DynamicLegend');
        set(hleg, 'FontSize',10);
        grid on
        elseif AOI_unique(i)==7
        %%Plot
        hplt=plot(times, col7, colors{mod(i-1,4)+1}, 'DisplayName', 'column 7');
        hold on
        hplt=plot(times, row7, 'b--', 'DisplayName', 'row 7');
        hold on
        hleg=legend('-DynamicLegend');
        set(hleg, 'FontSize',10);
        grid on
        elseif AOI_unique(i)==8
        %%Plot
        hplt=plot(times, col8, colors{mod(i-1,4)+1}, 'DisplayName', 'column 8');
        hold on
        hplt=plot(times, row8, 'r--', 'DisplayName', 'row 8');
        hold on
        hleg=legend('-DynamicLegend');
        set(hleg, 'FontSize',10);
        grid on
    end
%     i=i+1;
 end

MATLAB: A MATLAB Dice Function to display the face of the dice

From the suggestion by @Image Analyst, I used Scatter and it worked.

The Output:

The Code is :

hold on
rectangle('Position',[1.5 1.25 1 1.5],'Curvature',0.2, "FaceColor",'k') 
axis([0 5 0 5])
v=randi(6);
switch v
    case 1
        hold on
        scatter(2, 2, 'filled', 'w')
    case 2
        scatter(1.75, 2.5, 'filled', 'w')
        hold on
        scatter(2.25, 1.5, 'filled', 'w')
        hold on
    case 3
        scatter(1.75, 1.5, 'filled', 'w')
        hold on
        scatter(2, 2, 'filled', 'w')
        scatter(2.25, 2.5, 'filled', 'w')
        hold on
    case 4
        scatter(1.75, 1.5, 'filled', 'w')
        hold on
        scatter(1.75, 2.5, 'filled', 'w')
        scatter(2.25, 1.5, 'filled', 'w')
        scatter(2.25, 2.5, 'filled', 'w')
        hold on
    case 5
        scatter(1.75, 1.5, 'filled', 'w')
        hold on
        scatter(1.75, 2.5, 'filled', 'w')
        scatter(2.25, 1.5, 'filled', 'w')
        scatter(2.25, 2.5, 'filled', 'w')
        scatter(2, 2, 'filled', 'w')
    case 6
        scatter(1.75, 1.5, 'filled', 'w')
        hold on
        scatter(1.75, 2.5, 'filled', 'w')
        scatter(2.25, 1.5, 'filled', 'w')
        scatter(2.25, 2.5, 'filled', 'w')
        scatter(1.75, 2, 'filled', 'w')
        scatter(2.25, 2, 'filled', 'w')
        hold on
end
axis([0 4 0 4])

Best Answer

Related Solutions

MATLAB: How to automatically assign colors to data that’s being dynamically plotted and recycle the colors if there’s more data that needs to be plotted

MATLAB: A MATLAB Dice Function to display the face of the dice

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