[R] Index vectors get overwriten ?!

[A.J. Rossini]

"_" 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> -------------------------------------------------------
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-- 
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
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