How to flip a line upside down?

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Ezz El-din Abdullah 2017-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/323026-how-to-flip-a-line-upside-down

评论： Adam 2017-2-2

采纳的回答： Adam

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How can I flip this line upside down:

This is my code that may not need flipud() :

x = [1 2 3];
y = [2 2.5 3.5];
flipud(plot(x,y))

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Ezz El-din Abdullah 2017-2-2

Why is the 'line' a scalar object not an array?

Adam 2017-2-2

编辑：Adam 2017-2-2

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Because it is a line object. There is only one line. Of course, it depends what version of Matlab you are using. If you are < R2014b then it will simply be a 'magic' double which you can query for the line properties.

Take a look at the output of

h = plot( x, y )

on the command line and you will see what it is. It is an object containing many useful properties of the line - e.g. colour, width, x data, y data

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Adam 2017-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/323026-how-to-flip-a-line-upside-down#answer_253042

编辑：Adam 2017-2-2

在 MATLAB Online 中打开

figure; hAxes = gca;
x = [1 2 3];
y = [2 2.5 3.5];
plot( hAxes, x, y )
set( hAxes, 'YDir', 'reverse' ) % Or hAxes.YDir = 'reverse' from R2014b onwards

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Ezz El-din Abdullah 2017-2-2

I mean it's like considering the image a paper and I would like to flip it over upside down so that e.g. the point at y=20 will be at y=70 and so on.

Is it clear now?

Adam 2017-2-2

Then you probably want the above maths or something similar. If you want 20 to become 70 then just substitute 70 and 20 in instead of max( data ) and min( data )

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