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 Belgium + 32 2 525 02 51 + 32 54 43 61 85 thierry.onkel...@inbo.be www.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-boun...@r-project.org [mailto:r-help-boun...@r-project.org] Namens Tim Smith Verzonden: donderdag 16 januari 2014 14:32 Aan: r Onderwerp: [R] ifelse... Hi, Sorry for the newbie question! My code: x <- 'a' ifelse(x == 'a',y <- 1, y <- 2) print(y) 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??? thanks! > sessionInfo() R version 3.0.2 (2013-09-25) Platform: x86_64-apple-darwin10.8.0 (64-bit) locale: [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 pr! eprocessCore_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 [[alternative HTML version deleted]] * * * * * * * * * * * * * D I S C L A I M E R * * * * * * * * * * * * * Dit bericht en eventuele bijlagen geven enkel de visie van de schrijver weer en binden het INBO onder geen enkel beding, zolang dit bericht niet bevestigd is door een geldig ondertekend document. The views expressed in this message and any annex are purely those of the writer and may not be regarded as stating an official position of INBO, as long as the message is not confirmed by a duly signed document. ______________________________________________ R-help@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.
