R help - Oct 2014 - How to check to see if a variable is within a range of another variable

Is there an easy way to check whether a variable is within  +/- 10%
range of another variable in R?

Say, if I have a variable 'A', whether its in +/- 10% range of
variable 'B' and if so, create another variable 'C' to say
whether it
is or not?

Is there a function that is able to do that?

eventual outcome:
A B C
67 76 no
24 23 yes
40 45 yes
10 12 yes
70 72 yes
101 90 no
9 12 no

On Wed, Oct 1, 2014 at 3:11 PM, Kate Ignatius <kate.ignatius at gmail.com>
wrote:
> Is there an easy way to check whether a variable is within  +/- 10%
> range of another variable in R?
Yes,

checkRange = function(A, B, range = 0.1)
{
  A>=B*(1-range) & A<=B*(1+range);
}

Test:

A = c(67, 24, 40, 10, 70, 101, 9)
B = c(76, 23, 45, 12, 72, 90, 12)

outcome = checkRange(A, B)

You can create the desired data frame for example as

data.frame (A = A, B=B, C = c("no", "yes")[outcome+1])
>
> Say, if I have a variable 'A', whether its in +/- 10% range of
> variable 'B' and if so, create another variable 'C' to say
whether it
> is or not?
What do you mean by range of variable B? In your example below, 40 is
not within 10% of 45, which is 4.5; 10 is not within 10% of 12 which
is 1.2.
>
> eventual outcome:
> A B C
> 67 76 no
> 24 23 yes
> 40 45 yes
> 10 12 yes
> 70 72 yes
> 101 90 no
> 9 12 no

HTH,

Peter

Tena koe Kate

If kateDF is a data.frame with your data, then

apply(kateDF, 1, function(x) isTRUE(all.equal(x[2], x[1], check.attributes =
FALSE, tolerance=0.1)))

comes close to (what I think) you want (but not to what you have illustrated in
your 'eventual outcome').  Anyhow, it may be enough to allow you to get
there.

HTH ....

Peter Alspach

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Kate Ignatius
Sent: Thursday, 2 October 2014 11:11 a.m.
To: r-help
Subject: [R] How to check to see if a variable is within a range of another
variable

Is there an easy way to check whether a variable is within  +/- 10% range of
another variable in R?

Say, if I have a variable 'A', whether its in +/- 10% range of variable
'B' and if so, create another variable 'C' to say whether it is
or not?

Is there a function that is able to do that?

eventual outcome:
A B C
67 76 no
24 23 yes
40 45 yes
10 12 yes
70 72 yes
101 90 no
9 12 no

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