[R] From for loop to lappy?

[MacQueen, Don]

Try

A <- lapply(file.names, function(fn) extract_tables(fn)


--
Don MacQueen
Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062
Lab cell 925-724-7509
 
 

On 10/1/18, 3:32 PM, "R-help on behalf of Ek Esawi" <r-help-bounces using r-project.org on behalf of esawiek using gmail.com> wrote:

    Hi All—
    
    I am using Tabulizer to extract tables from PDF files. Tabulizer
    creates a list of matrices for each set of tables in each document.
    My code, below, works well. Then i thought i would use lapply instead
    of for loop since it is a little faster and more compact,
    but i kept getting an error message below.
    
    Any help is greatly appreciated
    
    EK
    
    install.packages("tabulizer")
    installed.packages("stringr")
    library(stringi)
    library(tabulizer)
    path = "C:/Users/name/Documents/TextMining/"
    file.names <- dir(path, pattern =".PDF")
    
    for(i in 1:length(file.names)){
      print(file.names[i])
      A[[i]] <- extract_tables(file.names[i])
    }
    
    
    lapply(file.names, function(i) A[[i]] <- extract_tables(file.names[i]))
    
     Error in normalizePath(path.expand(path), winslash, mustWork) :
      path[1]="NA": The system cannot find the file specified
    
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