How can I add the arrow to the graph like this picture ?

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Nguyen Trong Nhan
Nguyen Trong Nhan 2013-12-23
评论： Image Analyst 2013-12-23
http://free.ssc.vn/images/98img_therm30_1.png
I make a plot in GUI, How can I add the arrow on the graph like the picture ? help me. Thanks you very much.

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采纳的回答

Image Analyst
Image Analyst 2013-12-23
Nguyen, there is an annotation function that will do arrows:
annotation('arrow',x,y)
annotation('doublearrow',x,y)
annotation('textarrow',x,y)
But the arrows are straight, not curving/swooping . To get curved arrows like you showed, you'd have to create the curving/swooping lines and then use plot() to plot them. Then you'd have to set "hold on" and call annotation to put a small arrow on top of the curving line you drew with plot().
  2 个评论
Nguyen Trong Nhan
Nguyen Trong Nhan 2013-12-23
编辑：Nguyen Trong Nhan 2013-12-23
I want the arrow lying on graph to point the direction of thermodynamics cycle. How I have to use annotation to do that ? Could you give me an example.I'm freshman in Vietnam. Hope you help me. thanks

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Youssef Khmou
Youssef Khmou 2013-12-23
编辑：Youssef Khmou 2013-12-23
Nguyen, That is thermodynamic cycle, there might be a solution, however try this temporary example :
X=[2 4 4 2 2]; Y=[2 1 5 7 2];
plot(X,Y)
axis([0 7 0 7])
xlabel('Volume'), ylabel('Pressure');
Try then to put carefully the arrows with these commands :
gtext('>','FontSize',20,'Rotation',-30);
gtext('<','FontSize',20,'Rotation',-30);
gtext('<','FontSize',20,'Rotation',-90);
gtext('<','FontSize',20,'Rotation',90);
Try to choose the right angle in the property "Rotation" .

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