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Greetings, Anyway to help to create ridgeline by MATLAB

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Yaser Khojah
Yaser Khojah 2019 年 11 月 26 日
コメント済み: Jacqueline Chrabot 2021 年 7 月 19 日
Greetings,
Anyway to help to create ridgeline by MATLAB as the attache link please?
  3 件のコメント
Adam Danz
Adam Danz 2019 年 11 月 26 日
What release of matlab are you using? That's one of the options to fill in when asking a question and it's an important thing for us to know.

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採用された回答

Adam Danz
Adam Danz 2019 年 11 月 26 日
編集済み: Adam Danz 2019 年 11 月 28 日
Here's a demo that creates a number of guassian distributions as input. The code produces an appropriate number of contiguous subplots where you can set the left, right, upper, and lower margins. Then it uses histfit() to compute and plot the density functions of each data. The code extracts the (x,y) values of the density curve and uses them to form a colored patch which replaces the histfit() plots. The axis limits and linked and some plot cosmetics are done to make the plot similar in appearance to the link you provided.
See inline comments for details.
% Generate n distributions
n = 8; % number of distributions
mu = linspace(0,100,n);
sd = (rand(size(mu)) +1).*2;
nSamp = 100; %number of samples per dist.
data = arrayfun(@normrnd,mu,sd,ones(size(mu)),nSamp.*ones(size(mu)),'UniformOutput',false); % req. stats & ML toolbox
yLabs = num2cell(char(64+cumsum(ones(1,n))));
Now we have two key input variables.
  1. data which is a 1 x n cell array where each element is a 1xm vector of data that will be used to compute a distribution.
  2. yLabs : a 1 x n cell array of characters used to label each distribution along the y axis.
% Generate figure.
fh = figure();
% Compute axes positions with contigunous edges
n = numel(data);
margins = [.13 .13 .12 .15]; %left, right, bottom, top
height = (1-sum(margins(3:4)))/n; % height of each subplot
width = 1-sum(margins(1:2)); %width of each sp
vPos = linspace(margins(3),1-margins(4)-height,n); %vert pos of each sp
% Plot the histogram fits (normal density function)
% You can optionally specify the number of bins
% as well as the distribution to fit (not shown,
% see https://www.mathworks.com/help/stats/histfit.html)
% Note that histfit() does not allow the user to specify
% the axes (as of r2019b) which is why we need to create
% the axes within a loop.
% (more info: https://www.mathworks.com/matlabcentral/answers/279951-how-can-i-assign-a-histfit-graph-to-a-parent-axis-in-a-gui#answer_218699)
% Otherwise we could use tiledlayout() (>=r2019b)
% https://www.mathworks.com/help/matlab/ref/tiledlayout.html
subHand = gobjects(1,n);
histHand = gobjects(2,n);
for i = 1:n
subHand(i) = axes('position',[margins(1),vPos(i),width,height]);
histHand(:,i) = histfit(data{i});
end
% Link the subplot x-axes
linkaxes(subHand,'x')
% Extend density curves to edges of xlim and fill.
% This is easier, more readable (and maybe faster) to do in a loop.
xl = xlim(subHand(end));
colors = jet(n); % Use any colormap you want
for i = 1:n
x = [xl(1),histHand(2,i).XData,xl([2,1])];
y = [0,histHand(2,i).YData,0,0];
fillHand = fill(subHand(i),x,y,colors(i,:),'FaceAlpha',0.4,'EdgeColor','k','LineWidth',1);
% Add vertical ref lines at xtick of bottom axis
arrayfun(@(t)xline(subHand(i),t),subHand(1).XTick); %req. >=r2018b
% Add y axis labels
ylh = ylabel(subHand(i),yLabs{i});
set(ylh,'Rotation',0,'HorizontalAlignment','right','VerticalAlignment','middle')
end
% Cosmetics
% Delete histogram bars & original density curves
delete(histHand)
% remove axes (all but bottom) and
% add vertical ref lines at x ticks of bottom axis
set(subHand(1),'Box','off')
arrayfun(@(i)set(subHand(i).XAxis,'Visible','off'),2:n)
set(subHand,'YTick',[])
set(subHand,'XLim',xl)
  8 件のコメント
Jacqueline Chrabot
Jacqueline Chrabot 2021 年 7 月 19 日
Adam,
I'm trying to reuse this code, to make a plot, except my data is set up in a field where y is depth, x is time and the data fills in columns 1-12 of chlorophyll data. I'm trying to fit gaussian for each colomn and then display them all in the graph you showed. Can you help with this?

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その他の回答 (2 件)

Image Analyst
Image Analyst 2019 年 11 月 28 日
Perhaps you'd be interested in stackedplot(): Pick of the Week
mainTiledLayout_07.png
>> doc stackedplot
Introduced in R2018b.

Santiago Benito
Santiago Benito 2020 年 4 月 21 日
編集済み: Santiago Benito 2020 年 4 月 21 日
Hi there,
Maybe it's a little late, but I stumbled upon the same problem. I really wanted the plots to overlap, so I did the following:
% Number of data plots
n = 8;
% Sample points
N = 100;
% Distribution, example data
distName = 'normal';
mn = linspace(0,1,n);
% Allocate a matrix to store the dataset
yData = zeros(N,n);
% Plot options
mini = -0.3;
maxi = 1.3;
overlap = 0.4;
% Create the data
for ii = 1:n
distCell = makedist(distName,'mu',mn(ii),'sigma',0.1);
yData(:,ii) = pdf(distCell,linspace(mini,maxi,N));
end
% Get the position of each dataset
y = cumsum(max(yData,[],1))*(1-overlap);
% Create the figure with patch & plot
figure, hold on
for ii = n:-1:1
patch([linspace(mini,maxi,N),-mini],[yData(:,ii)+y(ii);y(ii)],mn(ii),...
'EdgeColor','none','FaceAlpha',0.8)
plot(linspace(mini,maxi,N),yData(:,ii)+y(ii),'k','LineWidth',1)
end
hold off
% Other stuff
colormap(spring)
yticks(y)
yticklabels({'A','B','C','D','E','F','G','H'})
xlim([mini,maxi])
The result:
ridgelines matlab
Some thoughts:
  • This is not as elegant as the other solutions, but works for me.
  • You could add more information to the y-axis with some more coding.
Cheers!
  6 件のコメント
Adam Danz
Adam Danz 2020 年 4 月 23 日
The colorbar in the example above is a bit confusing. There are two yellows that have different values. The lower colorbar should be based on something like the winter colormap which doesn't have intersecting colors with the spring colormap. It's not clear why 2 colormaps/colorbars are needed.

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