[R] ifelse...

ONKELINX, Thierry Thierry.ONKELINX at inbo.be
Thu Jan 16 14:46:58 CET 2014

You want
y <- ifelse(x == 'a', 1,  2)

ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
+ 32 2 525 02 51
+ 32 54 43 61 85
Thierry.Onkelinx at inbo.be

To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] Namens Tim Smith
Verzonden: donderdag 16 januari 2014 14:32
Aan: r
Onderwerp: [R] ifelse...


Sorry for the newbie question! My code:

x <- 'a'
ifelse(x == 'a',y <- 1, y <- 2)

Shouldn't this assign a value of 1? When I execute this I get:

> x <- 'a'
> ifelse(x == 'a',y <- 1, y <- 2)
[1] 1
> print(y)
[1] 2

Am I doing something really daft???


> sessionInfo()
R version 3.0.2 (2013-09-25)
Platform: x86_64-apple-darwin10.8.0 (64-bit)

[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] splines   parallel  stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
 [1] Biostrings_2.30.1     XVector_0.2.0         IRanges_1.20.6        ggplot2_0.9.3.1       sda_1.3.2             fdrtool_1.2.11        corpcor_1.6.6
 [8] entropy_1.2.0         scatterplot3d_0.3-34  pdist_1.2             hash_2.2.6            DAAG_1.18             multicore_0.1-7       multtest_2.18.0 [15] XML_3.95-0.2          hgu133a.db_2.10.1     affy_1.40.0           genefilter_1.44.0     GOstats_2.28.0        graph_1.40.1          Category_2.28.0 [22] GO.db_2.10.1          venneuler_1.1-0       rJava_0.9-6           colorRamps_2.3        RColorBrewer_1.0-5    sparcl_1.0.3          gap_1.1-10 [29] plotrix_3.5-2         som_0.3-5             pvclust_1.2-2         lsr_0.3.1             compute.es_0.2-2      sm_2.2-5.3            imputation_2.0.1 [36] locfit_1.5-9.1        TimeProjection_0.2.0  Matrix_1.1-1.1        timeDate_3010.98      lubridate_1.3.3       gbm_2.1               lattice_0.20-24 [43] survival_2.37-4       RobustRankAggreg_1.1  impute_1.36.0         reshape_0.8.4         plyr_1.8              zoo_1.7-10            data.table_1.8.10 [50] foreach_1.4.1         foreign_0.8-57        languageR_1.4.1       preprocessCore_1.24.0 gtools_3.1.1          BiocInstaller_1.12.0  org.Hs.eg.db_2.10.1 [57] RSQLite_0.11.4        DBI_0.2-7             AnnotationDbi_1.24.0  Biobase_2.22.0        BiocGenerics_0.8.0    biomaRt_2.18.0

loaded via a namespace (and not attached):
 [1] affyio_1.30.0         annotate_1.40.0       AnnotationForge_1.4.4 codetools_0.2-8       colorspace_1.2-4      dichromat_2.0-0       digest_0.6.4
 [8] grid_3.0.2            GSEABase_1.24.0       gtable_0.1.2          iterators_1.0.6       labeling_0.2          latticeExtra_0.6-26   MASS_7.3-29 [15] munsell_0.4.2         proto_0.3-10          RBGL_1.38.0           RCurl_1.95-4.1        reshape2_1.2.2        scales_0.2.3          stats4_3.0.2 [22] stringr_0.6.2         tools_3.0.2           xtable_1.7-1          zlibbioc_1.8.0

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