MATLAB中不同的轴位置

Question

我正在尝试在Matlab图中移动轴位置。我想实现与此类似的东西（在gnuplot中完成）：

我不知道这是否可行，或者我可能找到答案，所以任何帮助都将不胜感激。

Answer 1

...嗯

所以让我们的情节：

x = zeros(1,21); y = -10:10; z = y/2;
figure; plot3(x,y,z); % a line from (0,-10,-5) to (0,10,5) similar to the example

嗯，有一个问题是matlab没有像你在那里那样自动绘制坐标轴。 这在这里讨论： How to show x and y axes in a MATLAB graph?

要绘制那些（3D），便宜的解决方案是：

locs = axis; % get current axis boundaries
hold on; 
plot3([locs(1) locs(2)], [0 0], [0 0]); %plot xaxis, a line between(-x,0,0) and (x,0,0);
plot3([0 0], [locs(3) locs(4)], [0 0]); %plot y axis, the line (0,-y,0) and (0,y,0);
plot3([0 0], [0 0], [locs(5) locs(6)]); % plot z axis
hold off

就像那个Gnu情节一样，3D matlab图是一个盒子里的＃34;＆＃34;与Gnu图不同，matlab框没有概述。如果你想勾勒出你也必须画出那些线......呃。

% lets plot the 12 lines to make this box in black ('k');
hold on;
% hold x constant and plot 4 parallel-to-x lines;
plot3([locs(1) locs(2)], [locs(3) locs(3)], [locs(5) locs(5)],'k'); % (-x,-y,-z) to (x,-y,-z)
plot3([locs(1) locs(2)], [locs(3) locs(3)], [locs(6) locs(6)],'k');
plot3([locs(1) locs(2)], [locs(4) locs(4)], [locs(5) locs(5)],'k');
plot3([locs(1) locs(2)], [locs(4) locs(4)], [locs(6) locs(6)],'k');
% plot parallel-to-y lines
plot3([locs(1) locs(1)], [locs(3) locs(4)], [locs(5) locs(5)],'k');
plot3([locs(1) locs(1)], [locs(3) locs(4)], [locs(6) locs(6)],'k');
plot3([locs(2) locs(2)], [locs(3) locs(4)], [locs(5) locs(5)],'k');
plot3([locs(2) locs(2)], [locs(3) locs(4)], [locs(6) locs(6)],'k');
% plot parallel-to-z lines
plot3([locs(1) locs(1)], [locs(3) locs(3)], [locs(5) locs(6)],'k');
plot3([locs(1) locs(1)], [locs(4) locs(4)], [locs(5) locs(6)],'k');
plot3([locs(2) locs(2)], [locs(3) locs(3)], [locs(5) locs(6)],'k');
plot3([locs(2) locs(2)], [locs(4) locs(4)], [locs(5) locs(6)],'k');
hold off;

现在我们有了这个盒子;

如果我们只想要区域y> 0，则z> 0;我们可以使用axis命令。 绘制完所有其他线条之后使用轴确实让我感觉很糟糕，所以我会在开始时决定你的极限。

所有在一起：

figure; 
plot3(x,y,z); % a line from (0,-10,-5) to (0,10,5) similar to the example
locs = axis;
axis([locs(1) locs(2) 0 locs(4) 0 locs(6)]);
locs = axis;

hold on; 
% plot axis
plot3([locs(1) locs(2)], [0 0], [0 0]); %plot xaxis, a line between(-x,0,0) and (x,0,0);
plot3([0 0], [locs(3) locs(4)], [0 0]); %plot y axis, the line (0,-y,0) and (0,y,0);
plot3([0 0], [0 0], [locs(5) locs(6)]); % plot z axis

% plot box
% hold x constant and plot 4 parallel-to-x lines;
plot3([locs(1) locs(2)], [locs(3) locs(3)], [locs(5) locs(5)],'k'); % (-x,-y,-z) to (x,-y,-z)
plot3([locs(1) locs(2)], [locs(3) locs(3)], [locs(6) locs(6)],'k');
plot3([locs(1) locs(2)], [locs(4) locs(4)], [locs(5) locs(5)],'k');
plot3([locs(1) locs(2)], [locs(4) locs(4)], [locs(6) locs(6)],'k');
% plot parallel-to-y lines
plot3([locs(1) locs(1)], [locs(3) locs(4)], [locs(5) locs(5)],'k');
plot3([locs(1) locs(1)], [locs(3) locs(4)], [locs(6) locs(6)],'k');
plot3([locs(2) locs(2)], [locs(3) locs(4)], [locs(5) locs(5)],'k');
plot3([locs(2) locs(2)], [locs(3) locs(4)], [locs(6) locs(6)],'k');
% plot parallel-to-z lines
plot3([locs(1) locs(1)], [locs(3) locs(3)], [locs(5) locs(6)],'k');
plot3([locs(1) locs(1)], [locs(4) locs(4)], [locs(5) locs(6)],'k');
plot3([locs(2) locs(2)], [locs(3) locs(3)], [locs(5) locs(6)],'k');
plot3([locs(2) locs(2)], [locs(4) locs(4)], [locs(5) locs(6)],'k');
hold off;

我相信你可以做得更好，但我认为这是一个非常好的开始。我会把所有这些混乱放入一个函数来保存输入。