Stacked line plot legend color change

I would like to change colors of the legend to match the line colors in the plot, however since legend options are fairly limited for stacked plots as it seems, I can't get it to work. I am running custom colors for the lines, but even when I am not, it only returns black lines for the legend. Any help or workaround is appreciated.

P=stackedplot(AL1,AL2,AL3,'DisplayLabels',["Burr [µm]" "Rounding [µm]"]);

title('Aluminium alloy samples')

xlabel('Process duration [min]')

P.AxesProperties(1).YLimits = [0 55];

P.AxesProperties(2).YLimits = [0 265];

grid on;

P.LineWidth = 1.25;

C = [0.3 0.5 0.7

0.2 0.7 0.7

0.1 0.9 0.7];

P.LineProperties(1).Color = C;

P.LineProperties(2).Color = C;

leg = getfield(struct(P),'LegendHandle');

leg(1).Orientation = 'Horizontal';

set(P.AxesProperties(1), 'LegendLocation', 'NorthEast');

P.AxesProperties(1).LegendVisible = 'on';

P.AxesProperties(1).LegendLabels = ["Sample 1","Sample 2","Sample 3"];

[Dyuman Joshi]

It seems to be working properly with random data here, see below.

Can you share the data you are working with, so I can reproduce the results you are getting? Use the paperclip button to attach.

%Random data
n = 10;
t = (1:n).';
a = zeros(n,1);
b = ones(n,1);
c = rand(n,1);

data = table(t, a, b, c);
vars = {["a" "b"], "c"};
s = stackedplot(data, vars, "XVariable", "t");

%Change color of lines in 1st plot
s.LineProperties(1).Color = hsv(2);
%Modify legend for the 1st plot
s.AxesProperties(1).LegendLabels = ["Yo", "Sup"];

%Display and set legend label for the 2nd plot
s.AxesProperties(2).LegendVisible = 'on';
s.AxesProperties(2).LegendLabels = {'This is a line plot'};

[Marek]

Strange, it did not ocurr to me to try it with different data. I have loaded the input from excel into variables and then those into timetables in Matlab. Not sure if that may be the issue?

[Marek]

Another thing, when there's only one timetable as an input for the stackedplot, legend color is displaying properly, but when there's two or more, it no longer works.

Answer 1

[Dyuman Joshi]

As you want to get the legend for individual chart(s) from a stackedplot of multiple tables/timetables, turn the "CollapseLegend" property of the corresponding axes to "off"

load('al_data.mat')
%Check the contents of the loaded data
whos

  Name         Size            Bytes  Class        Attributes

  AL1         13x2              1521  timetable              
  AL1B        13x1               104  double                 
  AL1R        13x1               104  double                 
  AL2         13x2              1521  timetable              
  AL2B        13x1               104  double                 
  AL2R        13x1               104  double                 
  AL3         13x2              1521  timetable              
  AL3B        13x1               104  double                 
  AL3R        13x1               104  double                 
  Dur         13x1               106  duration               
  ans          1x36               72  char                   
  cmdout       1x33               66  char                   

%Plot the stackedplot
P=stackedplot(AL1,AL2,AL3,'DisplayLabels',["Burr [µm]" "Rounding [µm]"]);
title("Aluminium alloy samples")
xlabel("Process duration [min]")

%Turn the stackedplot legend off
P.LegendVisible = "off";

ax = P.AxesProperties;
ax(1).YLimits = [0 55];
ax(2).YLimits = [0 265];
grid on;
P.LineWidth = 1.25;
C = [0.3 0.5 0.7
     0.2 0.7 0.7
    0.1 0.9 0.7];
P.LineProperties(1).Color = C;
P.LineProperties(2).Color = C;

%Display legend by disabling collapsing behaviour
ax(1).CollapseLegend = "off";
ax(1).LegendLabels = ["Sample 1","Sample 2","Sample 3"];

If you want to display the legend for the 2nd chart as well, follow the same commads for the 2nd axes.

You can adjust other legend properites as you like.

[Marek]

Thank you, CollapseLegend command fixed the issue.

[Dyuman Joshi]

You are welcome!