Combining subplots in a graphic window

xset("font',2,0);xsetech([0,0,0.5,0.5]);plot3d();
xsetech([0.5,0,0.5,0.5]);plot2d();
xsetech([0.5,0.5,0.5,0.5]);grayplot();
xsetech([0,0.5,0.5,0.5]);histplot();