# [R] Index vectors get overwriten ?!

A.J. Rossini rossini at blindglobe.net
Thu May 3 15:19:31 CEST 2001

```"_" is an assignment operator.  Use "." or capitalization to construct
variables.

best,
-tony

>>>>> "TB" == Thomas Bruns <Thomas.Bruns at ptb.de> writes:

TB> Hello, For some analysis of a mesh structure I need to prepare
TB> several vectors of indexes of different length. This is done
TB> by the following code sequence (including diagnostic output):
TB> #-------------------------------------------------- MT_ind <-
TB> which(V1.frame[,2] %in% mm[,1]) print("M_ind") str(M_ind)

TB> Q1_ind <- which(V1.frame[,2] %in% mq1) print("Q1_ind")
TB> str(Q1_ind)

TB> Q2_ind <- which(V1.frame[,2] %in% mq2) print("Q2_ind")
TB> str(Q2_ind)

TB> MS_ind <- which(V1.frame[,2] %in% ms) print("MS_ind")
TB> str(MS_ind)

TB> print ("---------------") print("M_ind") str(M_ind)
TB> print("Q1_ind") str(Q1_ind) print("Q2_ind") str(Q2_ind)
TB> print("MS_ind") str(MS_ind)
TB> #-----------------------------------------------------

TB> Although the Index vectors *_ind have different names they get
TB> subsequently overwriten, as you see in the diagnostic output:

TB> [1] "M_ind" int [1:12023] 6952 6953 6954 6957 6958 6959 6962
TB> 6963 6964 6965 ...  [1] "Q1_ind" int [1:331] 1 2 3 4 5 6 7 8 9
TB> 10 ...  [1] "Q2_ind" int [1:331] 6952 6957 6962 6963 6964 6965
TB> 6966 6967 6968 6969 ...  [1] "MS_ind" int [1:3] 15237 15238
TB> 15239 [1] "---------------" [1] "M_ind" int [1:3] 15237 15238
TB> 15239 [1] "Q1_ind" int [1:3] 15237 15238 15239 [1] "Q2_ind"
TB> int [1:3] 15237 15238 15239 [1] "MS_ind" int [1:3] 15237 15238
TB> 15239

TB> Everything is now equal to MS_ind which was asigned last!  So,
TB> can anybody tell me what's happened here? Am I working on
TB> memory pointers without knowing??

TB> Tia!

TB> Thomas

TB> -- -------------------------------------------------------
TB> Dr. Thomas Bruns <thomas.bruns at ptb.de>

TB>          Physikalisch-Technische Bundesanstalt Braunschweig
TB> Fachlabor: 1.13 Bundesallee 100 Tel: 0531/592 - 1132 D-38116
TB> Braunschweig Fax: 0531/592-69-1132
TB> -------------------------------------------------------
TB> -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
TB> r-help mailing list -- Read
TB> http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info",
TB> "help", or "[un]subscribe" (in the "body", not the subject !)
TB> To: r-help-request at stat.math.ethz.ch
TB> _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._

--
A.J. Rossini				Rsrch. Asst. Prof. of Biostatistics
UW Biostat/Center for AIDS Research	rossini at u.washington.edu
FHCRC/SCHARP/HIV Vaccine Trials Net	rossini at scharp.org
-------- (friday is unknown) --------
FHCRC: M--W : 206-667-7025 (fax=4812)|Voicemail is pretty sketchy
CFAR:  ??   : 206-731-3647 (fax=3694)|Email is far better than phone
UW:    Th   : 206-543-1044 (fax=3286)|Change last 4 digits of phone to FAX
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._

```