# centre vertex

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 May 22, 2012, 00:52 centre vertex #1 New Member   vibhor goel Join Date: May 2012 Location: India Posts: 14 Rep Power: 6 Hi all, Given a circle, how can i find its centre vertex in GAMBIT?

 May 22, 2012, 01:04 #2 Super Moderator   Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,285 Blog Entries: 6 Rep Power: 43 draw a line from two extreme point and place a point at the centre. Here is the description. Lets say you have circle with points ------------- (x2, y2) (x3, y3) ------------------- (x1, y1) ------------- (x4, y4) Note that y1=y3= 0 Now go to vertex option. Use vertex on the edge. Make the y = 0 (twice) and you get vertices at x1 and x2). Now create the edge by connecting vertex x1 and x2. Now select again point on edge and this time give u= 0.5 and you are done. There is also another method to do the same thing. But it depends upon the situation that which method to use.

May 22, 2012, 04:37
#3
New Member

vibhor goel
Join Date: May 2012
Location: India
Posts: 14
Rep Power: 6
Quote:
 Originally Posted by Far draw a line from two extreme point and place a point at the centre. Here is the description. Lets say you have circle with points ------------- (x2, y2) (x3, y3) ------------------- (x1, y1) ------------- (x4, y4) Note that y1=y3= 0 Now go to vertex option. Use vertex on the edge. Make the y = 0 (twice) and you get vertices at x1 and x2). Now create the edge by connecting vertex x1 and x2. Now select again point on edge and this time give u= 0.5 and you are done. There is also another method to do the same thing. But it depends upon the situation that which method to use.
Thank you very much Far, for your reply....But I had some difficulty in assimilating what you said. I could not understand in which plane (XY, YZ OR ZX) have you considered the circle while expalining the procedure. If it is in XY OR YZ plane, I could not understand how 2 points on the circle have the points with thier ordinate zero. and if it is in ZX plane, i can understand that all the y's would be zero. Could you please give me clarity on this...Thanx a lot

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