[R] first value...

[Alfredo Alessandrini]

I've the NA value also between the value of the vector:

> inc
  [1]        NA        NA        NA        NA        NA        NA        NA
  [8]        NA        NA        NA        NA        NA        NA        NA
 [15]        NA        NA        NA        NA        NA        NA        NA
 [22]        NA        NA        NA        NA        NA        NA        NA
 [29]        NA        NA        NA        NA        NA        NA        NA
 [36]        NA        NA        NA        NA        NA        NA        NA
 [43]        NA        NA        NA        NA        NA        NA        NA
 [50]        NA        NA        NA        NA        NA        NA        NA
 [57]        NA        NA        NA        NA        NA        NA        NA
 [64]        NA        NA        NA        NA        NA        NA        NA
 [71]        NA        NA        NA        NA        NA        NA        NA
 [78]        NA        NA        NA        NA 13.095503 10.140119  7.989186
 [85]  8.711888  7.201234 13.029250 14.430755  8.662832  8.810785 14.421302
 [92]  7.614985  7.548091  9.843389 14.977402 20.875255  7.787543  2.005056
 [99]  4.016916  3.601773  4.140390  7.241999 13.280794 18.038902 18.762169
[106]  4.280065  5.942021  6.292010 11.866446 19.450442 11.942362  6.224328
[113]  3.176050  5.456117  2.733487  3.992823 13.633171 19.514301 25.085256
[120]  5.640089  5.890486 12.421150 18.821420 22.478664 11.503805  7.051254
[127]  7.560921 12.000394 20.464875 16.147598 13.746290  9.416060 35.848221
[134] 36.739481 23.516759  7.317599  3.928247 10.371437 11.202935 12.574649
[141]  6.906980  9.191260  7.080267  2.810271  5.494705 10.617141 14.578020
[148] 10.981610  7.343975  2.179511  2.726651 10.794842  9.872493        NA
[155] 10.525064 16.134541 29.283385 18.352996  9.216318  6.253805  2.704267
[162]  4.274514  3.138237 12.296835 20.982433 13.001104  2.606328  3.333271
[169]  5.514425  2.179244  5.381514  6.848380  3.794428  5.114591  4.975830
[176]  3.809948 10.131608 14.145913
>

> inc[82]
[1] 13.09550

>  which(diff(is.na(inc)) < 0)
[1]  81 154

> inc[154]
[1] NA


I must obtain only the first value, in this case: inc[82].


Regards,

Alfredo




2009/6/23 Henrique Dallazuanna <wwwhsd at gmail.com>
>
> Try this:
>
>  which(diff(is.na(inc)) < 0)
>
> On Tue, Jun 23, 2009 at 11:00 AM, Alfredo Alessandrini <alfreale74 at gmail.com> wrote:
>>
>> Hi,
>>
>> I've a vector like this:
>>
>> > inc
>>  [1]        NA        NA        NA        NA        NA        NA        NA
>>  [8]        NA        NA        NA        NA        NA        NA        NA
>>  [15]        NA        NA        NA        NA        NA        NA        NA
>>  [22]        NA        NA        NA        NA        NA        NA        NA
>>  [29]        NA        NA        NA        NA        NA        NA        NA
>>  [36]        NA        NA        NA        NA        NA        NA        NA
>>  [43]        NA        NA        NA        NA        NA        NA        NA
>>  [50]        NA        NA        NA        NA        NA        NA        NA
>>  [57]        NA        NA        NA        NA        NA        NA        NA
>>  [64]        NA        NA        NA        NA        NA        NA        NA
>>  [71]        NA        NA        NA        NA        NA        NA        NA
>>  [78]        NA        NA        NA        NA 13.095503 10.140119  7.989186
>>  [85]  8.711888  7.201234 13.029250 14.430755  8.662832  8.810785 14.421302
>>  [92]  7.614985  7.548091  9.843389 14.977402 20.875255  7.787543  2.005056
>>  [99]  4.016916  3.601773  4.140390  7.241999 13.280794 18.038902 18.762169
>>
>> I must obtain the position of first value of the vector...
>>
>> In this case is 82.
>>
>> > inc[82]
>> [1] 13.09550
>>
>>
>> Regards,
>>
>> Alfredo
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
>
>
> --
> Henrique Dallazuanna
> Curitiba-Paraná-Brasil
> 25° 25' 40" S 49° 16' 22" O



--
----------------------------------------------
Alfredo Alessandrini, Dr.
Post-doc
Department of Environment and Forest (DAF)
Unitus - Viterbo
http://www.unitus.it/dipartimenti/daf/dendro/