arithmetic comparison over corresponding values from two vectors

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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

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

works for your example data, but there's probably a better way
For large scale problems this works well:

 	 http://finzi.psych.upenn.edu/R/Rhelp02a/archive/60815.html

HTH,

Chuck
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

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                                             Dept of Family/Preventive Medicine
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