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Re: Point of intersection [message #61816 is a reply to message #61815]

Wed, 30 July 2008 09:11

Juggernaut
Messages: 83
Registered: June 2008

Member

On Jul 30, 11:55 am, Bennett <juggernau...@gmail.com> wrote:
> 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
>
> Well if the y values are always equal like you have there then they
> will intersect where the x values are equal. Unless I'm thinking the
> wrong way? Which is entirely possible....

Think I may have jumped the gun there...what you really want to do
since your dataset does not have any x that match (what I neglected to
see because I'm not the brightest bulb) is to interpolate both your
x's over a longer range and then find where they match within some
error...like the following

x1_int = interpol(x1, 100)
x2_int = interpol(x2, 100)
location = where(abs(x1_int-x2_int) LT 0.001) ;- Where you can set
your error to whatever it is that you want..which I assume will depend
on the degree to which you interpolate

For your case this gives the intersection to be 0.4666

Hope this helps get you in the right direction....as well as myself

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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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