Adding a colorbar to parallel coordinate plot

Question

Eileen Lukens 2021-8-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1441599-adding-a-colorbar-to-parallel-coordinate-plot

评论： Jiri Junek 2022-1-11

Hi all,

I am doing a parallel coordinate plot using the "parallelplot" plot command (example shown below). I have a range of 100 values as my "GroupVariable" and rather than have a 100 different categories for my legend, I just want to use a colorbar to show the gradient. I know I can plot in otherways to avoid this issue, but given that parallel coordinate plots can present and highlight data differently based on the arrangement of your factors and grouping strategies, I want to give a colorbar a try since I like this arrangement best for my data. Is there a way to add a colorbar legend easily? The only other option I can think of is doing two subplots, one with the parallel plotting command and another with a simple plotting command that will let me add a colorbar, and then supressing the second subplot and only showing the associated colorbar. But that's a little involved ,so I am hoping for a simpler solution.

Thanks in advanced!

%% generate numbers

a = randi([1,5],100,1);

b = randi([3,9],100,1);

c = randi([10,20],100,1);

d = rand(100,1);

%% make table

labels = {'a', 'b', 'c','d'};

T = table(a,b,c,d,'VariableNames',labels);

coordvars = {'a','b','c'};

%%sort rows for plotting

T_sort = sortrows(T,4);

%% plotting

p = parallelplot(T_sort,'CoordinateVariables',coordvars,'GroupVariable','d','DataNormalization','zscore');

p.Jitter = 0.3;

% assign color

p.Color = autumn;

%%%%%%%%%%% insert colorbar legend somehow instead of 100 different categories?? %%%%%%%%%%%%%

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Chunru 2021-8-27

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1441599-adding-a-colorbar-to-parallel-coordinate-plot#answer_775254

在 MATLAB Online 中打开

You can try to put a color bar in a subplot.

a = randi([1,5],100,1);

b = randi([3,9],100,1);

c = randi([10,20],100,1);

d = rand(100,1);

%% make table

labels = {'a', 'b', 'c','d'};

T = table(a,b,c,d,'VariableNames',labels);

coordvars = {'a','b','c'};

%%sort rows for plotting

T_sort = sortrows(T,4);

%% plotting

subplot(1,8, [1:7])

p = parallelplot(T_sort,'CoordinateVariables',coordvars,'GroupVariable','d','DataNormalization','zscore');

p.Jitter = 0.3;

% assign color

p.Color = hsv;

p.LegendVisible = 'off';

subplot(1,8,8);

ncolors = size(p.Color, 1);

image(1, 1:ncolors, (1:ncolors)'); axis xy

colormap(p.Color);

2 个评论
显示无隐藏无

Eileen Lukens 2021-8-27

编辑：Eileen Lukens 2021-8-27

在 MATLAB Online 中打开

Thank you! This was super helpful!! It was very close to what I wanted. I had to adjust it a little to work for my purposes since my actual data set is set up a bit different. I needed to scale the colorbar to my data set range in the end. In case anyone runs into the same thing, the final code that worked best for my specific data set is below. However, for the example I provided, @Chunru's solution works best. Thanks!

a = randi([1,5],100,1);
b = randi([3,9],100,1);
c = randi([10,20],100,1);
d = rand(100,1);
%% make table
labels = {'a', 'b', 'c','d'};
T = table(a,b,c,d,'VariableNames',labels);
coordvars = {'a','b','c'};
%%sort rows for plotting
r = 4;
T_sort = sortrows(T,r);
%% plotting 
subplot(1,8, [1:7])
p = parallelplot(T_sort,'CoordinateVariables',coordvars,'GroupVariable','d','DataNormalization','zscore');
p.Jitter = 0.3;
p.LegendVisible = 'off';
% assign color
p.Color = hsv(length(table2array(T_sort(:,r)))); 
%define CData
scale_data = table2array(T_sort(:,r));
%formatting colorbar
subplot(1,8,8);
m = image('XData',[0 1],'YData',scale_data,...
    'CData',flipud(scale_data),'CDataMapping','scaled');
axis xy
colormap(flipud(p.Color))
ylim([min(scale_data),max(scale_data)])
xlim([0,1])
set(gca,'xtick',[])