lintr

Author: venom1204

R/data.table.R

@@ -741,8 +741,9 @@ replace_dot_alias = function(e) {
       if (is.character(j)) {
         if (!missingby) {
         warning(
-            "`by` or `keyby` is ignored when `j` is a character vector used for column selection. ",
-            "Perhaps you intended to use `.SD`? For example: DT[, .SD[, ", deparse(jsub), "], by = ...]"
+          "`by` or `keyby` is ignored when `j` is a character vector used for column selection. ",
+          "Perhaps you intended to use `.SD`? For example: DT[, .SD[, ", deparse(jsub), "], by = ...]",
+          call. = FALSE
         )
         }
         if (notj) {
@@ -770,8 +771,8 @@ replace_dot_alias = function(e) {
       } else if (is.numeric(j)) {
         if (!missingby) {
         warning(
-            "`by` or `keyby` is ignored when `j` is a numeric vector used for column selection. ",
-            "Perhaps you intended to use `.SD`? For example: DT[, .SD[, ", deparse(jsub), "], by = ...]"
+          "`by` or `keyby` is ignored when `j` is a numeric vector used for column selection. ", "Perhaps you intended to use `.SD`? For example: DT[, .SD[, ", deparse(jsub), "], by = ...]",
+          call. = FALSE
         )
         }
         j = as.integer(j)

man/data.table.Rd

@@ -97,8 +97,8 @@ data.table(\dots, keep.rownames=FALSE, check.names=FALSE, key=NULL, stringsAsFac
 
     See \href{../doc/datatable-intro.html}{\code{vignette("datatable-intro")}} and \code{example(data.table)}.}
 
-    \item{by}{ Column names are seen as if they are variables (as in \code{j} when \code{with=TRUE}). \emph{Note that \code{by} and \code{keyby} are ignored when \code{j} is a character or numeric vector used for selecting columns (i.e., when the internal \code{with=FALSE} is triggered).} The \code{data.table} is then grouped by the \code{by} and \code{j} is evaluated within each group. ...}    
-    
+    \item{by}{ Column names are seen as if they are variables (as in \code{j} when \code{with=TRUE}). \emph{Note that \code{by} and \code{keyby} are ignored when \code{j} is a character or numeric vector used for selecting columns (i.e., when the internal \code{with=FALSE} is triggered).} The \code{data.table} is then grouped by the \code{by} and \code{j} is evaluated within each group. The order of the rows within each group is preserved, as is the order of the groups. \code{by} accepts:    
+
     \itemize{
         \item A single unquoted column name: e.g., \code{DT[, .(sa=sum(a)), by=x]}