R help - Feb 2009 - arithmetic comparison over corresponding values from two vectors

Hi,
I have scenario in which I wish to check whether numeric values in one array
falls within the range of numbers defined over corresponding values in two
other vectors:

starts = c(12,45,67,110)
ends=c(24, 58,102,150)

trgroup=c(18,87)

The result should be "1,3" , indices of vector starts/ends.
which(trgroup>=starts & trgroup<=ends) wouldn't give required
result.
I don't want to write a for loop for doing this.  Kindly help with ideas.

Josh

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on 02/10/2009 11:02 AM T Joshi wrote:
> Hi,
> I have scenario in which I wish to check whether numeric values in one
array
> falls within the range of numbers defined over corresponding values in two
> other vectors:
> 
> starts = c(12,45,67,110)
> ends=c(24, 58,102,150)
> 
> trgroup=c(18,87)
> 
> The result should be "1,3" , indices of vector starts/ends.
> which(trgroup>=starts & trgroup<=ends) wouldn't give required
result.
> I don't want to write a for loop for doing this.  Kindly help with
ideas.
> 
> Josh
Try this:
> sapply(trgroup, function(x) which((x >= starts) & (x <= ends)))
[1] 1 3

HTH,

Marc Schwartz

sapply(trgroup, function(x) which(x>=starts & x <=ends))

works for your example data, but there's probably a better way

HTH

KJ

"T Joshi" <tejalonline at gmail.com> wrote in message 
news:11417a880902100902w53664a3dq11aee64a963d8383 at
mail.gmail.com...
> Hi,
> I have scenario in which I wish to check whether numeric values in one 
> array
> falls within the range of numbers defined over corresponding values in two
> other vectors:
>
> starts = c(12,45,67,110)
> ends=c(24, 58,102,150)
>
> trgroup=c(18,87)
>
> The result should be "1,3" , indices of vector starts/ends.
> which(trgroup>=starts & trgroup<=ends) wouldn't give required
result.
> I don't want to write a for loop for doing this.  Kindly help with
ideas.
>
> Josh