[R] Linear Integration

[Michael Bedward]

Hi Alex,

> In the picture are depicted the areas that I need to calculate somehow. Of
> course the easiest way would be to use some already implemented function
> which does not seem to exist.

That was why I posted a function to calculate polygon area in my
previous reply :)  Have you tried that approach ?

Michael


On 6 October 2010 22:21, alaios <alaios at yahoo.com> wrote:
>
> I would like to thank you for your reply.
> Yes I had this conversation of how to find the cells that are touched.
>
>
> I did that with these two lines:
> temp<-(floor(cbind(seq(x[1],xr[1],by=0.01),lineeq(x,xr)))) #.
> cellid2 <-unique( floor(cbind(seq(x[1],xr[1], by=0.01), lineeq(x,xr)) ) ) #
> cell ids that are touched
>
> You can find in the picture below how the cells look like for a line that
> spans from (2,11) to (3,8)
>
> http://img824.imageshack.us/img824/9914/lineu.jpg
>
> In the picture attached you can see that there are some points missing
> denoted by * which I do not know how to find out. I need them to find the
> proportion a line gets into each cell.
> You mentioned something like "densified vertices of the line" but I am not
> sure what does it mean.
>
> In the picture are depicted the areas that I need to calculate somehow. Of
> course the easiest way would be to use some already implemented function
> which does not seem to exist.
>
> I would like to thank everyone that contributed to this so far.
> Best Regards
> Alex
>
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