[R] How to insert a name from a list into a double loop

[Giuseppa Cefalu]

Hello,

The script below works well when I define the elementname <- list("name1",
"name2", "name3") .  Please see program below.
SCRIPT
```
glyCount1 <- function(answer = NULL, fileChoice = NULL, combination = NULL,
enteredValue = NULL, nameList) {

lc <- enteredValue
choseDataFiles = TRUE

first_path <- NULL
new_path <- NULL

new_dataFns <- list()

new_dataFns <- as.list(unlist(strsplit(as.character(nameList), ",")))

file_content <- NULL

elementname <- list("name1", "name2", "name3")

  for(i in 1:length(lc)){
     for(j in 1:length(lc[[i]])){
       first_path[j]<- paste(getwd(), "/", lc[[i]][j], sep = "")
       print(first_path[j])
      #  file_content[[j]] <- read.csv(file = first_path[[i]], header =
TRUE, sep = ",")
       for(k in 1:length(elementname)){
         if(k == i){
           new_path[j] <- paste(getwd(),"/", i, elementname[k], ".csv", sep
= "")
           print (new_path[j])
        }
      }
     }
  }
}

```
SCRIPT OUTPUT:

[1] "/home/giuseppa/Development/glycoPipeApp/1name1.csv"
[1] "/home/giuseppa/Development/glycoPipeApp/1name1.csv"
[1] "/home/giuseppa/Development/glycoPipeApp/1name1.csv"
[1] "/home/giuseppa/Development/glycoPipeApp/1name1.csv"
[1] "/home/giuseppa/Development/glycoPipeApp/2name2.csv"
[1] "/home/giuseppa/Development/glycoPipeApp/2name2.csv"
[1] "/home/giuseppa/Development/glycoPipeApp/2name2.csv"
[1] "/home/giuseppa/Development/glycoPipeApp/3name3.csv"
[1] "/home/giuseppa/Development/glycoPipeApp/3name3.csv"


However, If instead of using the list "elementname" I call the script
through an app and I enter the list of names through a textbox, which then
is passed to the glycoPipe1 function.  Please see below.  The same script
does not return the expected output.

'new_dataFns <- list()
new_dataFns <- as.list(unlist(strsplit(as.character(nameList), ","))) is
used in the script when the value passed to the function by the app's
textinput (nameList) is used, in which case I would substitute the
elementname list buythe new_dataFns list, please see block code below.

BLOCK OF CODE
```
  for(i in 1:length(lc)){
     for(j in 1:length(lc[[i]])){
       first_path[j]<- paste(getwd(), "/", lc[[i]][j], sep = "")
       print(first_path[j])
      #  file_content[[j]] <- read.csv(file = first_path[[i]], header =
TRUE, sep = ",")
       for(k in 1:length(elementname)){
         if(k == i){
           new_path[j] <- paste(getwd(),"/", i, elementname[k], ".csv", sep
= "")
           print (new_path[j])
        }
      }
         }
```

I am sending the app below just in case you need it.  but I wonder if it
has to do with the list:
new_dataFns <- as.list(unlist(strsplit(as.character(nameList), ","))) .  It
seams that elementname a new_dataFns do not work in the same way in the
script.

Am I am building the new_dataFns list incorrectly?.  It seems as if the
values could not be accessed.

Thank you for your help


APP PROGRAM
```
library(shiny)
library(shinyjs)

ui <- fluidPage(
  selectInput("combinefiles", label = h5(strong("Do you wish to combine any
data files, and compare the combined data sets? (Y/N) ")),
              choices = c("", "Y", "N"),selected = NULL),
  verbatimTextOutput("combiningFiles"),
  verbatimTextOutput("combineChosen"),
  #verbatimTextOutput("filesToCombine"),
  useShinyjs(),
  conditionalPanel(
    condition = "output.toCombine > '0'",
    selectInput(inputId = "select",label = h5(strong("Please select from
the list")), choices = c(Chose = "",
list.files("~/Development/glycoPipeApp")), multiple = TRUE, selectize =
TRUE)
  ),
  conditionalPanel(
    condition = "output.displayAddButton > '0'",
    actionButton('add','Add')
  ),
  verbatimTextOutput("samelist"),
  conditionalPanel(
    condition = "output.displayAddButton == 1",
    actionButton("sBtn", "Press the save button to end")
  ),

  conditionalPanel(
    condition = "output.displayTheSaveButton  > '0'",
    textInput("textbox", h5(strong("Please enter name/s to designate
combined set/s separated by comma")))),
  strong(verbatimTextOutput("list")),
  verbatimTextOutput("caption")


)

#selections = NULL,

glycoPipe <- function(response = NULL, fOfData = NULL, combineResult =
NULL, listContents = NULL, vals = NULL){

enteredValue = NULL
nameList = NULL
answer = NULL
fileChoice = NULL
combination = NULL
combinations = NULL
comb = NULL
nameListSize = NULL
choseDataFiles = NULL

if(!is.null(response)){
  answer = response
}
if(!is.null(fOfData)){
  fileChoice = fOfData
}

if(!is.null(combineResult)){
  combination = combineResult
}

if(!is.null(listContents)){
  enteredValue = listContents
}

if(!is.null(vals)){
  nameList <- vals
}

glyCount1(answer, fileChoice, combination, enteredValue, nameList)

}

  server <- function(input, output, session){
    listContents = NULL

    source("Utilities/utilities.R")
    source("glycoPipeFunctions/glycoPipe_fcns.R")
    source("glyCount1.R")

    output$toCombine <- reactive({
      req(input$combinefiles)
      return(length(input$combinefiles))
    })

    outputOptions(output, "toCombine", suspendWhenHidden = FALSE)

        output$displayAddButton <- reactive({
        req(input$combinefiles)
        return(length(input$combinefiles))
     })

    outputOptions(output, "displayAddButton", suspendWhenHidden = FALSE)

    output$displayTheSaveButton <- reactive({
       req(input$sBtn)
       return(input$sBtn)
     })

    outputOptions(output, "displayTheSaveButton", suspendWhenHidden = FALSE)

      myValues <- reactiveValues()
      observe({
      if(input$add > 0){
         myValues$dList <- c(isolate(myValues$dList),
isolate(list(input$select)))
       }
    })

    # #unlist(input$filescombine)
    output$samelist<-renderPrint({
       #listContents  <- list()

       listContents <- append(listContents, myValues$dList)
       print(listContents)
      if(input$sBtn > 0){
        numberOfSelectedSets <- glycoPipe(response = NULL, fOfData = NULL,
combineResult = NULL , listContents)
        paste("Please enter", numberOfSelectedSets$nameListSize, "names to
designate your", numberOfSelectedSets$nameListSize, "sets")
       }
     })

    VALUES <- list()
     observe({
       isolate({
         req(input$textbox)
         VALUES <- input$textbox
         VALUES <- append(VALUES, list(input$textbox))
         updateTextInput(session, inputId = "textbox", value = VALUES)

      })
     })

     output$caption <- renderPrint({
       vals <- list()
       vals <- append(vals, input$textbox)
       if(input$sBtn > 0){
         result <- glycoPipe(response = NULL, fOfData = NULL, combineResult
= NULL, listContents = NULL, vals)
         #unlist(input$filescombine)
      }
     })

    session$allowReconnect(TRUE)

  }
  shinyApp(ui = ui, server = server)
```

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