如何在Maxima draw中将原点设置为O并删除零标签? [英] How to set the origin to O and remove the zero labels in Maxima draw?

问题描述

Maxima中的draw(2d)函数具有一些控制轴的设置，但据我所知，没有一个隐藏xy轴的零标签并将其替换为0或O.

The draw (2d) function in Maxima has several settings to control the axis, but as far as I can tell, none that hides the zero label of the xy-axis and to replace it with either a 0 or a O.

也许可以与选项user_preamble一起使用?

Maybe that's possible to use with the option user_preamble?

推荐答案

您将需要显式设置xtics和ytics值，省略原点，并使用label标记原点.

You will need to set the xtics and ytics values explicitly, omitting the origin, and use label to label the origin.

load(draw)$
draw2d( user_preamble="set zeroaxis linetype 5; set xtics axis;
   set ytics axis; set border 0;", 
   xtics={-3, -2, -1, 1, 2, 3},
   ytics={-1, -1/2, 1/2, 1},
   label(["O", 0, 0]),
   explicit(sin(x),x,-%pi, %pi))$

如果您不希望在上面的示例中将原点标签显示在交叉点处，则可以调整标签坐标.用label(["O", -0.15, 0.1])替换label(["O",0,0])给出

You can tweak the label coordinates if you don't want the origin label to appear right at the intersection in my example above. Replacing label(["O",0,0]) with label(["O", -0.15, 0.1]) gives

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