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## Re: Draw a line through 2 points

 From: Sue Stones Subject: Re: Draw a line through 2 points Date: Sun, 16 May 2004 15:29:29 +1000 User-agent: KMail/1.5

```Thanks a lot everyone for your helpful responses.  That gives me a much better
idea of how Octave works.

sue

On Sunday 16 May 2004 12:57 am, Ted Harding wrote:
> On 15-May-04 Sue Stones wrote:
> > How do I draw a line through 2 points.  Not just between the points
> > but going off the graph on either side?
> >
> > sue
>
> You can do it by specifying two other points to define a line which
> includes the two given points.
>
> e.g. (adjust t1, t2 to your taste; the values below extend the line
> between p1 and p2 to either side by 10 times the distance between
> p1 and p2):
>
>   p1=[x1;y1]; p2=[x2;y2];
>   t1=(-10); t2=(+10);
>   P1=p1 + t1*(p2-p1) ; P2=p2 + t2*(p2-p1);
>
> Now draw a line from P1 to P2 (when t1=0 and t2=0 you get the original
> points p1 and p2).
>
> Hope this helps,
> Ted.
>
>
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> Date: 15-May-04                                       Time: 15:57:30
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Octave is freely available under the terms of the GNU GPL.

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