How can I weight the marker size in gscatter?

Hello,

I'm using gscatter to plot data by group. I have two vectors of size 100x1 that contain the x and y value, called x and y. I also have a vector of the same size, w, that contains weights. Now, I'd like to weigh the scatter dots by this matrix w. I tried something like

h = gscatter(x,y,gr,linspecer(length(b)-1),'.',30);
h.MarkerSize = w*30;

but it looks like Matlab only accepts a scalar for the marker size.

Thanks for your help.

Answer 1

[Walter Roberson]

gscatter() creates lines, and lines can only have one marker size per line.

Consider using multiple scatter() calls instead, one per group (because scatter can only handle one marker shape per call)

[Christian]

Thanks, Walter. I wonder how I can then add the legend.

    markersize  = 30;
    Col         = linspecer(3);
    hold on
    for c = 1:3
        scatter(x(gr==c),y(gr==c),markersize*w(gr==c),'MarkerEdgeColor',Col(c,:));
    end
    hold off
    legend({'Gr1','Gr2','Gr3'});

This clearly doesn't work. It only gives me an empty framed box. Thanks for your ideas.

[Christian]

I got it to work.

    markersize  = 30;
    Col         = linspecer(3);
    h = [];
    hold on
    for c = 1:3
        h = [h scatter(x(gr==c),y(gr==c),markersize*w(gr==c),'MarkerEdgeColor',Col(c,:))];
    end
    hold off
    legend(h,{'Gr1','Gr2','Gr3'});