在MATLAB中翻转y轴。

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 ?

有没有一种方法可以把y轴翻转到matlab中，这样y轴的正方向，而不是向上，向下?

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

(我请求你;请不要说，把它打印出来，然后把纸翻过来。

5 个解决方案

#1

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.

“YDir”轴属性可以是“正常”或“反向”。默认情况下，大多数情节都是“正常”的，但有些情节会自动将其改为“反向”，比如图像或图像功能。

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

可以用set函数或点索引(在新的MATLAB版本中)设置坐标轴的y轴方向:

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

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:

我被一些其他的答案迷惑了，说“YDir”的属性不知怎么消失了，或者出现了错误。在2013年、2014年或2016年的MATLAB版本中，我从未见过这样的行为。我遇到的潜在陷阱只有两个:

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

属性不能设置为单元数组，只有字符串:

>> 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'.

although this works:

虽然这个工作原理:

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

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):

在执行点索引时，gca函数不能作为句柄来交换使用(这就是为什么我在上面的例子中第一次将它保存到一个变量h中):
```
>> 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'
```

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

最后，如果您需要一些代码来切换“YDir”属性，不管它当前的状态是什么，您可以这样做:

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

#2

The command

命令

axis ij

轴ij

Will also reverse the Y-axis (negative above x-axis; positive below).

也会反转y轴(x轴上方为负);积极的下面)。

#3

The solutions on the top of the stack did not work for me,

堆栈顶部的解决方案对我不起作用，

imagesc(x,y,data) % results in a flipped plot, the y axis is upside down

imagesc(x,y,data) %结果在一个翻转的图中，y轴是颠倒的。
set(gca,'YDir','reverse'); % gives an error

集(gca、“YDir”“反向”);%给了一个错误
axis ij; % still gives the flipped plot

轴ij;%仍然给出翻转的图。

what did work was the following:

工作内容如下:

imagesc(x,y,data); axis xy;  % results in the correct plot

The YDir property has vanished in the matlab version (2013 and up) that I'm using.

YDir属性在我使用的matlab版本(2013和up)中消失了。

#4

To update this answer, since it is still a popular Google result: As of R2014a, the correct way to flip the Y axis is the following:

为了更新这个答案，因为它仍然是一个流行的谷歌结果:在R2014a中，翻转Y轴的正确方法如下:

>> axis ij

This change can be reversed through the following command

可以通过以下命令反转此更改。

>> axis ji

To flip the X or Z axes, do the following

要翻转X或Z轴，请执行以下操作。

set(gca,'XDir','reverse');

集(gca、“XDir”“反向”);

set(gca,'ZDir','reverse');

集(gca、“ZDir”“反向”);

Personally, I think it would have been easier to keep the YDir option, but what do I know.

就我个人而言，我认为保留YDir选项会更容易些，但我知道什么呢?

#5

As an alternative to YDir (for some reason I cannot currently see) you can rotate the axes with view. To turn the y-axis upside down, use

作为YDir的替代(出于某些原因，我目前无法看到)，您可以使用视图旋转坐标轴。将y轴翻转过来，使用。

view(0,-90);

#1