There is currently no built-in MATLAB function that can achieve this behavior for 3-D plots, as PLOTYY can for 2-D plots. However, there are two possible workarounds that can be used to achieve a similar behavior:
1) Scale your data such that all z-values are in a comparable range, then plot all data on a single set of axes using the HOLD ON command. For example,
[x,y,z] = sphere(16); % generate sample data
bigz = z*100; % generate scaled z data
scatter3(x(:),y(:),z(:),'bo') % plot sample data
hold on % disable erasing
scatter3(x(:),y(:),bigz(:)/100,'r*') % plot scaled data
2) Plot your data on separate axes placed at the same position, with all but one of the axes rendered invisible. This workaround involves manipulating axes properties with the SET and GET functions. For example,
[x,y,z] = sphere(16); % generate sample data
bigz = z*100; % generate scaled z data
scatter3(x(:),y(:),z(:),'bo') % plot sample data
posAx1 = get(gca,'Position'); % get position of current axes
hAx2 = axes('Position',posAx1); % create duplicate axes at same position
scatter3(hAx2,x(:),y(:),bigz(:),'r*') % plot scaled data on duplicate axes
set(hAx2,'Visible','off'); % make duplicate axes invisible
Though both these workarounds should enable you to view data sets of disparate magnitude together in a single plot area, neither unfortunately enables multiple z-axis labels and numberings. Axis locations in 3-D plots in MATLAB currently cannot be changed. Hence, only one z-axis can be displayed legibly at a time in 3-D plots, whereas two y-axes can be displayed simultaneously in 2-D plots (i.e. by placing one on either side of the plot area as PLOTYY does).
