drawing a circle
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please help i need to draw a green circle of radius 0.8 centered at x =2 , y=1.5 and display the result with the correct aspect ratio that is as a circle not an ellipse
then i need to fill the circle with gray and mark the center of the circle with a black X
回答（2 个）
Image Analyst
2012-5-23
1 个投票
Make sure you set "axis square" or "axis equal" and call "hold on" before you call text() or plot() to put on the "X".
3 个评论
lowcalorie
2012-5-23
Oleg Komarov
2012-5-23
Have you checked the link? It has code examples.
Also do NOT double post.
Your post is NOT an emergency:
http://www.mathworks.com/matlabcentral/answers/29922-why-your-question-is-not-urgent-or-an-emergency
Walter Roberson
2012-5-23
You do not actually need "hold on" before using text() or line() or patch() or a small number of other primitive calls. However, plot() is not a primitive call and you _do_ need "hold on" before using it to overlay data on the same axes.
Chad Greene
2014-12-9
circles(2,1.5,0.8,'facecolor','green');
axis equal
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2012-5-23
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