CODEWITHSUNDEEP
rvectorindexingnumeric
Avi
Avi

Reputation: 2283

Can't find numeric value index

I have the following a:

> a
 [1] 0.32142857 0.21428571 0.10714286 0.46428571 0.42857143 0.57142857 0.35714286 0.50000000 0.67857143 0.07142857 0.92857143 0.60714286
[13] 0.17857143 0.25000000 1.00000000 0.71428571 0.64285714 0.78571429 0.57142857 0.28571429 0.57142857 0.39285714 0.96428571 0.85714286
[25] 0.75000000 0.53571429 0.82142857 0.14285714 0.39285714 0.21428571 0.03571429 0.89285714
> str (a)
 num [1:32] 0.321 0.214 0.107 0.464 0.429 ...
> class (a)
[1] "numeric"

I would like to find the index value for specific element. When I use it for integer it works, but not for the others:

> which (a==1)
[1] 15
> which (a==0.10714286)
integer(0)
> match (0.10714286,a)
[1] NA

How can I get the index value 3 for 0.10714286?

Upvotes: 0

Views: 77

Answers (2)

mpjdem
mpjdem

Reputation: 1544

You'll have to search for the nearest value instead:

val <- 0.10714286
idx <- which.min(abs(a - val))

Upvotes: 3

Saurabh Chauhan
Saurabh Chauhan

Reputation: 3221

Simply use the vector to store the data. Kindly go through the following code:

> a=c(0.32142857,0.21428571,0.10714286,0.46428571,0.42857143)
  > str(a)
  num [1:5] 0.321 0.214 0.107 0.464 0.429
  > a[1]
  [1] 0.3214286
  > a[2]
  [1] 0.2142857
  > a[3]
  [1] 0.1071429
  > a[4]
  [1] 0.4642857
  > which(a==0.10714286)
  [1] 3
  > class(a)
  [1] "numeric"
  > match(0.10714286,a)
  [1] 3

Hope it works for you.

Upvotes: 0

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