在MATLAB中将y轴上下颠倒 [英] Turning y axis upside down in MATLAB

问题描述

是否有一种方法可以在Matlab图中将y轴上下颠倒，从而使y轴的正方向(而不是向上)指向下方?

Is there a way to turn the y axis upside down in matlab plots, so that the positive direction of the y axis, instead of up, points down ?

(我求求你；请不要说，先将其打印出来，然后将纸张翻过来；-)

(I beg of you; please do not say, print it out, then turn the paper around ;-)

推荐答案

函数.

The 'YDir' axes property can be either 'normal' or 'reverse'. By default it is 'normal' for most plots, but some plots will automatically change it to 'reverse', such as the image or imagesc functions.

您可以使用 set 函数或点索引(在较新的MATLAB版本中):

You can set the y-axis direction of an axes with either the set function or dot indexing (in newer MATLAB versions):

h = gca;  % Handle to currently active axes
set(h, 'YDir', 'reverse');
% or...
h.YDir = 'reverse';

我对其他一些回答感到困惑，这些回答说'YDir'属性以某种方式消失或出现错误.在2013年，2014年或2016年的MATLAB版本中，我还没有看到任何此类行为.我遇到了两个潜在的陷阱:

I'm baffled by some of the other answers saying that the 'YDir' property has somehow disappeared or is giving an error. I haven't seen any such behavior in versions of MATLAB from 2013, 2014, or 2016. There are only two potential pitfalls I came across:

• 该属性不能用单元格数组设置，只能用字符串设置:

• The property can't be set with a cell array, only a character string:

>> set(gca, 'YDir', {'reverse'});
Error using matlab.graphics.axis.Axes/set
While setting property 'YDir' of class 'Axes':
Invalid enum value. Use one of these values: 'normal' | 'reverse'.

尽管可行:

set(gca, {'YDir'}, {'reverse'});  % Property name is also a cell array

gca 函数无法在执行点索引时可以互换使用作为句柄(这就是为什么我在上面的示例中首先将其保存到变量h的原因):

The gca function can't be used interchangeably as a handle when performing dot indexing (which is why I first saved it to a variable h in the above example):

>> gca.YDir
Undefined variable "gca" or class "gca.YDir". 
>> gca.YDir = 'reverse'  % Creates a variable that shadows the gca function
gca = 
  struct with fields:

    YDir: 'reverse'

最后，如果您想要一些代码来切换'YDir'属性，无论其当前状态如何，都可以执行以下操作:

Finally, if you want some code that will toggle the 'YDir' property no matter what its current state is, you can do this:

set(gca, 'YDir', char(setdiff({'normal', 'reverse'}, get(gca, 'YDir'))));
% or...
h = gca;
h.YDir = char(setdiff({'normal', 'reverse'}, h.YDir));

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