Must control the cartography the abscissa axis and the ordinate axis proportion, may use axis to coordinate the following related option: axis ([xmin xmax ymin ymax]) by xmin the xmax hypothesis abscissa axis's lower limit and the upper limit, hypothesis ordinate axis's lower limit and upper limit axis the auto abscissa axis and the ordinate axis schedules by ymin the ymax according to the data size's bound, the abscissa axis and the ordinate axis proportion are 4:3 axis the square abscissa axis and the ordinate axis proportion are 1:1 axis equal suppose the abscissa axis ordinate axis criterion proportion same value axis the xy predetermined value use card coordinate are attempt the zero point to be located in the left bottom abscissa axis to increase the ordinate axis to increase progressively axis the ij use matrix form are from bottom to top from left to right attempt the zero point to be located in the top left-hand corner abscissa axis invariable ordinate axis to increase progressively from top to bottom axis normal by the predetermined value picture ordinate axis andAbscissa axis axis off cancels the ordinate axis and the abscissa axis axis on to restore the ordinate axis and abscissa axis the above each instruction grammar may also place the key words in the parentheses between the single quotes, like axis ('').below is applies axis the model: >> x=linspace(0,2*pi,30); y=sin(x); z=cos(x); >> plot(x, y, x, z) >> axis off >> axis on >> axis ('square', 'equal') >> axis ('xy', 'normal')