matlab用bar3函数把一个矩阵作直方图,即矩阵的值作为Z轴的值.但是默认的X,Y坐标值为1,2,3.

ar3(rand(3))
set(gca,'xticklabel',{'-1','0','1'})
set(gca,'yticklabel',{'-1','0','1'})