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.gitignore
vendored
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9
.gitignore
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@ -95,4 +95,13 @@ flycheck_*.el
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# network security
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/network-security.data
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# html files
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*.html
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# images
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*.png
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*.jpg
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*.jpeg
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# pdf
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*.pdf
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15
README.org
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15
README.org
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@ -1,3 +1,14 @@
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# intro_r
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* A brief introduction to R
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Scripts describing simple tasks to learn the first steps to work with data using R programming environment
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Scripts describing simple tasks to learn the first steps to work with
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data using the R programming environment
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** First steps in R
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* [[./script/help_r.R][Asking for help to use R]]
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* [[./script/integerq_modulo.R][Integer quocient and modulo]]
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* [[./script/non_stand_eval.R][Non-standard evaluation in R]]
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** Subsetting and indexing
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* [[./script/replace_values.R][Build column in table indexing values]]
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22
script/replace_values.R
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script/replace_values.R
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@ -71,9 +71,9 @@ maior_valor <- function (df, a, b, c, ...) {
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linhas <- nrow(df)
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coluna <- rep(0, times = linhas)
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coluna[a_maior] <- "a"
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coluna[b_maior] <- "b"
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coluna[c_maior] <- "c"
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coluna[a_maior] <- names(df)[[1]]
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coluna[b_maior] <- names(df)[[2]]
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coluna[c_maior] <- names(df)[[3]]
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df$V1 <- coluna
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@ -103,3 +103,19 @@ dfd %>%
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m == 3 ~ names(.)[3],
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TRUE ~ as.character(m)
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))
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#' ## Usando o pacote "datatable"
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library(data.table)
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class(df)
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dt <- setDT(df)
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#' Using "apply" to know the greatest value by each row ("1") across
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#' columns
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dt[, great := apply(df, 1, which.max)
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][, great := as.character(great)
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][, great := c("1" = "a",
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"2" = "b",
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"3" = "c")[great]]
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