matlab - Is it possible to make hist3 plots smoother? -

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i use hist3() function plot density of points. creates grid , finds number of points in each grid, creates plot. colors on plot discrete. there option make distribution smooth, i.e. make transition 1 color smoother. cells of grid have different colors, grin yellow , distribution not apparent.

i use following code. 

axis equal; colormap(jet); n = hist3(final',[40,40]); n1 = n';  n1( size(n,1) + 1 ,size(n,2) + 1 ) = 0;  xb = linspace(min(final(:,1)),max(final(:,1)),size(n,1)+1); yb = linspace(min(final(:,2)),max(final(:,2)),size(n,1)+1); pcolor(xb,yb,n1);

thanks in advance.

you may want use gridfit function matlab file exchange. smooth effect comes both interpolation (more points plot) , full use of available color (colormap jet here). note edgecolor set noneso black lines removed.

as used here, takes output of hist3 (20x20 matrix) , interpolate (100x100). plot surface using surf. in addition, can uncomment camlight option.

final = randn(1000,2)';   n = hist3(final',[20,20]); %binning   figure('color','w');    %your code pcolor    subplot(1,2,1);   axis equal;   colormap(jet);   n1 = n';    n1( size(n,1) + 1 ,size(n,2) + 1 ) = 0;    xb = linspace(min(final(:,1)),max(final(:,1)),size(n,1)+1);   yb = linspace(min(final(:,2)),max(final(:,2)),size(n,1)+1);   pcolor(xb,yb,n1)     %density gridfit function   subplot(1,2,2);   nb_interp_point = 100; [x,y] = meshgrid(1:size(n,1),1:size(n,2));   zgrid = gridfit(x(:), y(:), n, nb_interp_point, nb_interp_point);   surf(zgrid,'edgecolor','none')   set(gca,'ydir','reverse');   view(-90,90);   % camlight right   % lighting phong

here result

enter image description here


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