Change colours of specific points in a scatter plot that has already been plotted?

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David Haydock
David Haydock 2020-8-17
评论： David Haydock 2020-8-17
I have a dimensionality reduction algorithm that extracts latent variables from a dataset and visualises one latent variable with three subplots. The third of the three subplots is a scatter plot, and I want to change the colours of some of the points in this scatter plot.
I know what the indexes of the points that I want to change the colour of are, but I cannot just plot one set one colour and then another set another colour, because the plots are generated from a 3rd order tensor, and are not just datapoints.
Hence I ask: is it possible for me to change colours the datapoints in the plot, after they have been plotted?
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David Haydock
David Haydock 2020-8-17
I know the indices a priori, but I don't know the values that the datapoints are going to be until after I generate the plot.
Let me show the code to make this a bit clearer:
% M is a special type of array that contains special variables.
% Put simply, it isn't just the datapoints that I want
load('output_last.mat', 'M');
% This is a function from the tensor toolbox, it extracts out the datapoints that
% I want to plot from M.
[info] = viz_ktensor(M, ...
'Plottype', {'bar', 'line', 'scatter'}, ...
'Modetitles', {'neurons', 'time', 'trials'}),...
set(gcf, 'Name', ['estimated factors - fit #' num2str(n)])
The output is this:
I am focusing on the scatter plots on the far right here.
Do you see how I have to put my dataset into this black box called "viz_tensor" in order to get my plots?
So, I want to change the colours of certain datapoints on these scatter plots on the right hand side.
E.g. I know that in the 250 datapoints that I have, that I want 3, 7, 10... etc to all be green. But, because the datapoints come from a model, I don't know the value that they take on until after the plot.
I have the scatter plot, and I have the indices, so all I want to do is change the colours of datapoints on the plot for those specific indices.
David Haydock
David Haydock 2020-8-17
Update: figured it out. The output of the function "info" contains information of X and Y data for the plots so I can use these.
Apologies for the confusing question and thanks all for the help!

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采纳的回答

Abdolkarim Mohammadi
Take a look at gscatter().
  2 个评论
David Haydock
David Haydock 2020-8-17
This does look like it would be useful, but I dont know how to use this when I only have my datapoints after I have plotted them. The plots that I get come out of a toolbox that I would have to dig in to the change the scatters that are generated.
I can look at the information inside the generated scatter plot to see what the X and Y data are that are plotted, so how can I use this data inside gscatter?
Abdolkarim Mohammadi
Abdolkarim Mohammadi 2020-8-17
编辑：Abdolkarim Mohammadi 2020-8-17
You can first extract XData and YData of the figure you want, then create a grouping variable, where, for example, intact points are in group 1 and recolored points are in group 2, then you clear the axes, and draw your own scatter plot using gscatter().
Ax = subplot (3,3, 3);
X = Ax.Children(1).XData;
Y = Ax.Children(1).YData;
Grouping = ones (NumPoints,1);
Grouping (RecoloredPointsIndexes) = 2;
cla;
GscatterHdl = gscatter (X,Y,Grouping);
GscatterHdl(1) = 'b';
GscatterHdl(2) = 'g';
Next you do the same for
Ax = subplot (3,3, 6);
and
Ax = subplot (3,3, 9);

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