# [R] How to search for a sequence(and its combination) inside a vector?

C W tmrsg11 at gmail.com
Sat Jul 20 19:11:47 CEST 2013

```Thanks John.

Why do I get length of 5 and 6?  I thought I am only tallying up 1 to 3?
> table(dd)
val
leng TRUE
1    5
2    4
3   81
5    1
6    4

-M

On Sat, Jul 20, 2013 at 12:52 PM, John Kane <jrkrideau at inbox.com> wrote:
> Taking Berend's example a bit further, this seems to work
>
> If you use str(b) you will see it is a list
>
> b <- rle(a)
> cc  <-  data.frame(b[[1]], b[[2]])
> names(cc)  <-  c("leng", 'val')
> dd  <-  subset(cc, val ==TRUE )
> table(dd)
>
> John Kane
>
>
>> -----Original Message-----
>> From: tmrsg11 at gmail.com
>> Sent: Sat, 20 Jul 2013 12:36:55 -0400
>> To: bhh at xs4all.nl
>> Subject: Re: [R] How to search for a sequence(and its combination) inside
>> a vector?
>>
>> Hi Berend
>> I am looking for a table,
>> # of times one element (out of 1, 2, 3) showed up, two elements, and all
>> three.
>>
>> I am trying, don't know if this works:
>>
>>> aa <- rle(a)
>>> b <- aa\$lengths[aa\$values]
>>> table(b)
>> b
>>  1  3
>>  3 12
>>
>> Mike
>>
>>
>>
>> On Sat, Jul 20, 2013 at 12:24 PM, Berend Hasselman <bhh at xs4all.nl> wrote:
>>>
>>> On 20-07-2013, at 18:05, C W <tmrsg11 at gmail.com> wrote:
>>>
>>>> Hi R list,
>>>>
>>>> I have a sequence repeating 1:15 .  Some numbers are deleted.  I want
>>>> to find how many times 1, 2, 3 appeared.
>>>> Basically, I want to "grab" the beginning of the sequence and tally it
>>>> up.
>>>>
>>>> R code:
>>>>
>>>>> vec <- c(1, 2, 3, 4, 5, 6, 7, 8, 13, 1, 2, 3, 5, 7, 8, 10, 12, 13, 14,
>>>> 15, 1, 2, 3, 5, 6, 10, 12, 13, 1, 2, 3, 4, 5, 6, 7, 12, 13, 14,
>>>> 15, 1, 2, 3, 6, 9, 10, 11, 13, 14, 1, 7, 10, 13, 1, 2, 3, 4,
>>>> 6, 7, 9, 11, 14, 1, 2, 3, 5, 9, 10, 11, 12, 14, 1, 2, 3, 4, 1,
>>>> 2, 3, 4, 11, 12, 14, 1, 2, 3, 4, 8, 11, 12, 1, 2, 3, 4, 5, 7,
>>>> 8, 9, 11, 12, 15, 3, 14, 1, 2, 3, 6, 10, 11, 13, 14, 1)
>>>>
>>>>> a <- vec %in% c(1, 2, 3)
>>>>> a
>>>>  [1]  TRUE  TRUE  TRUE FALSE FALSE FALSE FALSE FALSE FALSE  TRUE
>>>> TRUE  TRUE FALSE FALSE
>>>> [15] FALSE FALSE FALSE FALSE FALSE FALSE  TRUE  TRUE  TRUE FALSE
>>>> FALSE FALSE FALSE FALSE
>>>> [29]  TRUE  TRUE  TRUE FALSE FALSE FALSE FALSE FALSE FALSE FALSE
>>>> FALSE  TRUE  TRUE  TRUE
>>>> [43] FALSE FALSE FALSE FALSE FALSE FALSE  TRUE FALSE FALSE FALSE
>>>> TRUE  TRUE  TRUE FALSE
>>>> [57] FALSE FALSE FALSE FALSE FALSE  TRUE  TRUE  TRUE FALSE FALSE
>>>> FALSE FALSE FALSE FALSE
>>>> [71]  TRUE  TRUE  TRUE FALSE  TRUE  TRUE  TRUE FALSE FALSE FALSE
>>>> FALSE  TRUE  TRUE  TRUE
>>>> [85] FALSE FALSE FALSE FALSE  TRUE  TRUE  TRUE FALSE FALSE FALSE
>>>> FALSE FALSE FALSE FALSE
>>>> [99] FALSE  TRUE FALSE  TRUE  TRUE  TRUE FALSE FALSE FALSE FALSE FALSE
>>>> TRUE
>>>>
>>>>> rle(a)
>>>> Run Length Encoding
>>>>  lengths: int [1:29] 3 6 3 8 3 5 3 8 3 6 ...
>>>>  values : logi [1:29] TRUE FALSE TRUE FALSE TRUE FALSE ...
>>>>
>>>> What should I do after this?
>>>>
>>>
>>>
>>> sum(a)
>>>
>>> or
>>>
>>> b <- rle(a)
>>> sum(b\$lengths[b\$values])
>>>
>>> Berend
>>>
>>>> Thanks,
>>>> Mike
>>>>
>>>> ______________________________________________
>>>> R-help at r-project.org mailing list
>>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>>> http://www.R-project.org/posting-guide.html
>>>> and provide commented, minimal, self-contained, reproducible code.
>>>
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
> ____________________________________________________________