MATLAB: How to use different markers for different X,Y pairs

graphicsmarkersMATLAB

I'd like to have separated (X,Y) points, marked by different markers and legend that describes those points. When I use plot(x1,y1,'+',x2,y2,'o') I have error message. Solution with plot()… hold on; plot()… is not convenient because in such a case legend not shows all pairs information. Thanks for ideas.

Best Answer

Plot by using two separate calls to plot:

 plot(x1(1),y1(1),'>','MarkerEdgeColor','y','MarkerFaceColor','m');
 hold on
 plot(x2(2),y2(2),'<','MarkerEdgeColor','m','MarkerFaceColor','c');

or whatever - not sure exactly what is a point and what is an array with your x,y. But anyway, this works - I've tried it.

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MATLAB: How to create a legend that explaines scatter plot by marker size

since you're using scatter one way around this is by doing this:

r1 = randi(10,1,10);
r2 = randi(10,1,10);
a = 30*randi(5,1,10);
bubsizes = unique(a)';
legentry=cell(size(bubsizes));
figure,hold on
for ind = 1:numel(bubsizes)
   bubleg(ind) = plot(0,0,'ro','markersize',sqrt(bubsizes(ind)),'MarkerFaceColor','red');
   set(bubleg(ind),'visible','off')
   legentry{ind} = num2str(bubsizes(ind));
end
h = scatter(r1,r2,a,'r','MarkerFaceColor','red')
legend(legentry)

I couldn't find a quick solution to the scatter plot marker area to plot's "markersize" but the sqrt() of the scatterplot marker area visually looks to be about the same.

MATLAB: I need to distribute n number of samples randomly on a given grid surface by monte carlo would you help me please.

Try this:

numPoints = 100; % Whatever you want
x = rand(1, numPoints);
y = rand(1, numPoints);
plot(x, y, 'b*');
grid on;

Best Answer

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MATLAB: How to create a legend that explaines scatter plot by marker size

MATLAB: I need to distribute n number of samples randomly on a given grid surface by monte carlo would you help me please.

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