Legend entries all same color in Matlab 2015b

I just updated to Matlab 2015b, and the frustration has already begun.

I am making a simple scatter plot with multiple data sets. Each data set has a different color, but the legend shows points all in the same color. Example code showing problem below: (ONLY IN 2015b)

---------------

x = 1:1:100;
y1 = rand(1,100);
y2 = rand(1,100);
y3 = rand(1,100);

figure;
scatter(x,y1);
hold on;
scatter(x,y2,'*');
scatter(x,y3);
legend('random 1','random 2','random 3') ;

---------------

The different symbol choice on 'random 2' illustrates that the problem is only with color, and not with referencing the same handle for each.

Help much appreciated!

Maddie

[Star Strider]

Definitely a bug. Nothing I tried (specifying colours and markers, returning handles and sending them to legend as arguments) alters what you saw. Since you discovered it, report it as a bug to TMW Tech Support.

[the cyclist]

Agree on bug report suggestion. This code works properly for me in 2015a, and not 2015b.

[Talfan Evans]

Also found this bug. Easy to use the plot command but specify the marker type, i.e:

scatter(x,y,'r')

produces the same output as:

plot(x,y,'or')

The bug doesn't seem to affect the plot command.

[joebob]

Hello, found a way to show the color in the legend by forcing the `MarkerFaceColor` property:

h = scatter(x_data, y_data, area_data, 'green', 'filled', 'MarkerFaceColor', 'green');

Answer 1

[Mike Garrity]

That sounds like bug 1283854. There's a patch and some workarounds at that link.

[Madison Smith]

That is exactly it. Thanks so much!

[lis coffey]

i guess the problem is only with color, and not with referencing the same handle for each. Thanks \ Qwikfix \

Answer 2

[Jacob Kamminga]

From the bugreport, Use this workaround when the points within each scatter plot are different colors:

Call the legend function with two or more output arguments:

s1 = scatter(1:10,1:10,[],1:10);
hold on
s2 = scatter(2:11,1:10,[],26:35);
[h, ~] = legend('show');

[Alexandre Damião]

Very nice! This worked perfectly for me. Thanks!

Answer 3

[Tony L.]

There must be a cleaner way to do this than the below, but gscatter seems to do the right thing:

x = 1:1:100;
y1 = rand(1,100);
y2 = rand(1,100);
y3 = rand(1,100);

g1 = repmat(1,length(y1),1);
g2 = repmat(2,length(y2),1);
g3 = repmat(3,length(y3),1);

ds = [x', y1', g1; x', y2', g2; x', y3', g3];

figure;
gscatter(ds(:,1), ds(:,2), ds(:,3));
legend('random 1','random 2','random 3') ;

Answer 4

[SHR]

I have a similar issue. My data set is a table with multiple variables over time associated with specific locations. I wanted to graph all variables (y axis) over time on one scatter plot only for one location. Thus I converted the dates to DateNumebers and restricted the variables by location e.g., Y1-Znppm(SiteCat=='location_x'. The legend has the same symbol color. Is there an easier way to circumvent the bug?

[Walter Roberson]

Are you using R2015a? If so then apply the patch Mike indicated.

Answer 5

[Amir Mohammad Alizadeh]

and the bloody doesn't work. MATLAB is horrible

[Walter Roberson]

Which MATLAB version are you using? Did you apply the patch?