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Re: Point of intersection [message #61815 is a reply to message #61801]

Wed, 30 July 2008 09:14

Bob[3]
Messages: 60
Registered: December 2006

Member

On Jul 30, 11:46 am, kishore1...@gmail.com wrote:
> Hello,
>
> I hope this is simple question for experienced guys.
> How to find out perfect point of intersection of x value and
> corresponding y value.
> For example:
> x1=[0.1,0.2,0.6,0.7]
> x2=[0.5,0.4,0.5,0.3]
> y=[1,2,3,4]
> plot,x1,y,xran=[0.,0.8]
> oplot,x2,y
>
> In this, two plots are intersection at one point, how to find out that
> particular interesection x and y value.
>
> Thanking you,
>
> Kishore

The lines cross where (x1(i)-x2(i)) changes sign.
ie. between the indices given by MAX(WHERE((x2-x1)>0)) and
MIN(WHERE((x2-x1)<0))

The exact intersection can then be found by determining the
intersection of the 2 straight lines defined by those points.

Bob.

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[Message index]

		Re: Point of intersection By: kishore1818 on Thu, 31 July 2008 06:44
		Re: Point of intersection By: kishore1818 on Thu, 31 July 2008 06:42
		Re: Point of intersection By: Wox on Thu, 31 July 2008 01:58
		Re: Point of intersection By: Wox on Thu, 31 July 2008 01:54
		Re: Point of intersection By: Wox on Thu, 31 July 2008 01:51
		Re: Point of intersection By: Bob[3] on Wed, 30 July 2008 09:14
		Re: Point of intersection By: Juggernaut on Wed, 30 July 2008 09:11
		Re: Point of intersection By: Juggernaut on Wed, 30 July 2008 08:55

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