Scatter plot with different colours

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Hopefully this is possible to be done.
Say I have an 10x2 array called "matrix1" and another 10x1 array called "matrix2".
"matrix2" is only made up of 1's and 2's
Using scatterplot I can plot matrix1(:,1) vs matrix1(:,2) easily like so,
scatter(matrix1(:,1),matrix1(:,2))
BUT what I want is to use "matrix2" to colour code the plots. For example if a row in "matrix2" shows a "1" the corresponding row number in "matrix1" is blue on the scatter plot and if "matrix2" shows a "2" the corresponding row number in "matrix1" is red on the scatter plot.
Any ideas would be much appreciated. I have looked at gscatter and groupings but getting a bit lost!
Craig

采纳的回答

Image Analyst
Image Analyst 2014-1-25
One input arg of scatter() is a list of colors for the various data points. So just make up a colorlist and pass it in, something like
myColors = zeros(size(matrix1, 1), 3); % List of rgb colors for every data point.
rowsToSetBlue = matrix2 == 1;
rowsToSetRed = matrix2 == 2;
myColors(rowsToSetBlue, :) = [0,0,1];
myColors(rowsToSetRed, :) = [1,0,0];
I haven't test that - it's just off the top of my head. If the last two lines don't work then you might have to use repmat() to make them exactly length(rowsToSetBlue) rows tall.
  4 个评论
Craig
Craig 2014-1-25
Ah perfect. That makes sense - thanks alot!
Craig
Craig 2014-2-17
Follow up question here - how do I recognise this in a legend? I have tried to add a legend to this plot and it only picks up the last defined colour (in this case red).
Help appreciated.

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更多回答(3 个)

Walter Roberson
Walter Roberson 2014-1-25
pointsize = 12;
colormat = matrix1(:,2);
scatter(matrix1(:,1), matrix1(:,2), pointsize, colormat);
  2 个评论
Craig
Craig 2014-1-25
I don't understand how this works - it doesn't incorporate "matrix2" at all.

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Jos (10584)
Jos (10584) 2014-2-17
Using GSCATTER is not that difficult:
matrix1 = rand(10,2) ; % [X,Y] data
matrix2 = rand(10,1)>0.5 ; % Grouping (0 or 1)
ph = gscatter(matrix1(:,1),matrix1(:,2), matrix2) % grouped scatter plot
% make it a little prettier
set(ph(1),'color','b','marker','s','markersize',20,'markerfacecolor','y','linewidth',2)
  2 个评论
vivek GB
vivek GB 2016-9-8
how to put axis limit in gscatter? xlim,ylim doesnt work when i tried
Image Analyst
Image Analyst 2016-9-8
What did you try? When I used Jos's code and added this at the end
xlim([-2,2]);
ylim([-5,10]);
it worked. What did you do differently?

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KONSTANTINOS
KONSTANTINOS 2023-6-22
Hi guys I also face the same problem and I would appreciate some help.
I have an 60*8 table where column 1 is "Name" and column 2 is "Run"
Now I also want to do a scatter plot with different shape for the name and different color for the run for the legend but it gets more complicated.
As you see they all are repeated twice and ideally i want to plot for X the first value and for Y the second value (I'm talking rows sorry if i cause any missunderstanding) for example. Francois (lets say shape 'o' ) WeightL (lets say colour 'green') and x would be asymmetry1 row1 and y would be asymmetry row2 and so on till end.
Any ideas?

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