diff --git a/R/and.R b/R/and.R
index 13e8e98..3614a52 100644
--- a/R/and.R
+++ b/R/and.R
@@ -134,7 +134,7 @@ and <- function(input, output, session, data, show.elements = NULL, element.grou
       # keep grouping order
       grouping <- grouping[unique(element.grouping[[2]])]
 
-      return <- lapply(1:length(grouping), function(i){
+      return <- lapply(seq_len(length(grouping)), function(i){
         group <- lapply(unlist(grouping[i]), function(x){
           progress$inc(step, detail = x)
 
@@ -164,7 +164,7 @@ and <- function(input, output, session, data, show.elements = NULL, element.grou
         shiny::tagList(shinydashboard::box(width = 12, collapsible = TRUE, collapsed = TRUE, title = names(grouping[i]), shiny::tagList(group)))
       })
     } else {
-      return <- lapply(1:ncol(data), function(x) {
+      return <- lapply(seq_len(ncol(data)), function(x) {
         progress$inc(step, detail = names(data)[x])
         if (is.numeric(data[[x]])) {
           ui <- orNumericUI(id = session$ns(openssl::sha1(names(data)[x])))
@@ -205,7 +205,7 @@ and <- function(input, output, session, data, show.elements = NULL, element.grou
     progress$set(0, message = "Filtering Module:")
     step <- ncol(data_r())
 
-    lapply(1:ncol(data_r()), function(x) {
+    lapply(seq_len(ncol(data_r())), function(x) {
       progress$inc(step, detail = names(data_r())[x])
       if (is.numeric(data_r()[[x]])) {
         if (parameter()$ranged[x]) {
diff --git a/R/featureSelector.R b/R/featureSelector.R
index 0e2be02..2d9f4ba 100644
--- a/R/featureSelector.R
+++ b/R/featureSelector.R
@@ -99,7 +99,7 @@ featureSelector <- function(input, output, session, clarion, multiple = TRUE, co
   # row_selector choices
   choices <- shiny::reactive({
     if (nrow(data_output()$data) > 0) {
-      c(1:nrow(data_output()$data))
+      seq_len(nrow(data_output()$data))
     } else {
       c(0, 0)
     }
diff --git a/R/function.R b/R/function.R
index 8152510..5506fef 100644
--- a/R/function.R
+++ b/R/function.R
@@ -798,7 +798,7 @@ create_geneview <- function(data, grouping, plot.type = "line", facet.target = "
 
   # place former colnames in cols
   data$cols <- data_cols
-  data.table::setcolorder(data, c("cols", colnames(data)[1:ncol(data) - 1]))
+  data.table::setcolorder(data, c("cols", colnames(data)[seq_len(ncol(data)) - 1]))
   # reattach ids as colnames
   names(data)[2:ncol(data)] <- data_id