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

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Nguyen Trong Nhan 2013-12-23

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评论： Image Analyst 2013-12-23

采纳的回答： Image Analyst

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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Answer 1

Image Analyst 2013-12-23

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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().

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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

Image Analyst 2013-12-23

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plot(x,y, 'k-');
annotation('arrow', [.3 .5], [.6 .5]);

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Answer 2

Youssef Khmou 2013-12-23

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编辑：Youssef Khmou 2013-12-23

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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);