How can I make my 'x' matrix in scatterplot in 2 different colors??

Question

Zhou Ci 2023-2-2

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评论： Walter Roberson 2023-2-3

Hello everyone,

I am trying to make a scatterplot of below data. Where temp should be on y-axis and rest of the five bins on x-axis. Regarding x-axis, I want 2nd column (Bin 1) to be in a different color and rest of the 4 bins in another color. I can't figure out how to do this. Any help would be highly appreciated. Thank you.

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Answer 1

Arif Hoq 2023-2-2

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编辑：Arif Hoq 2023-2-2

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temp=[-37; -19; -24; -14];

bin1=[0.0416;0.046667;0.044463;0.024943];

bin2=[0.107853;0.120159;0.114775;0.063871];

bin3=[0.071318;0.078653;0.075131;0.042547];

% bin1 plot

scatter(bin1,temp,'o','filled')

hold on

plot(bin1,temp,'ro','MarkerFaceColor','r')

% bin2 and bin3 plot

scatter([bin2 bin3], temp,'o','filled')

hold on

plot([bin2 bin3], temp,'go','MarkerFaceColor','g')

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Answer 2

Walter Roberson 2023-2-2

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A different approach would be to use gscatter

xdata = repmat(Temp, 5, 1);
ydata = [Bin1; Bin2; Bin3; Bin4; Bin5];
g = 2 * ones(size(ydata));  %everything is group 2
g(1:numel(Bin1)) = 1;       %except initial data
gscatter(xdata, ydata, g)

In this particular case it is probably easier to handle things the way that @Arif Hoq suggested... but gscatter() is an option that sometimes makes a lot of sense to use.

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Answer 3

Walter Roberson 2023-2-2

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scatter() can take information about color in the 4th parameter. The color information can be set per-point.

xdata = repmat(Temp, 5, 1);
ydata = [Bin1; Bin2; Bin3; Bin4; Bin5];
g = 2 * ones(size(ydata));  %everything is group 2
g(1:numel(Bin1)) = 1;       %except initial data
pointsize = [];
scatter(xdata, ydata, pointsize, g);

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Walter Roberson 2023-2-3

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Current versions of scatter would also support

h = scatter(Temp, [Bin1, Bin2, Bin3, Bin4,Bin5]);
h(1).CData = [1 0 0];  %red, must be rgb in this context
set(h(2:end), 'CData', [0 1 0]);  %green, must be rgb in this context

When you scatter() with multiple columns in a 2D array, each column becomes its own scatter() handle. Setting a property of a single handle such as h(1).CData can be done with assignment format, but setting the properties of multiple handles at the same time such as h(2:end) CData requires using set()

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