Mengatur argumen default per instrumen

Mengimpor dan Mengelola Data Keuangan di R

Joshua Ulrich

Quantitative Analyst & quantmod Co-Author and Maintainer

Gunakan setSymbolLookup() untuk mengatur sumber data

setSymbolLookup(AAPL = "google")

aapl <- getSymbols("AAPL", auto.assign = FALSE)
str(aapl)  # perhatikan atribut 'src'

Objek ‘xts’ pada 2007-01-03/2017-02-22 berisi:
  Data: num [1:2552, 1:5] 12.3 12 12.2 12.3 12.3 ...
 - attr(*, "dimnames")=List of 2
  ..$ : NULL
  ..$ : chr [1:5] "AAPL.Open" "AAPL.High" "AAPL.Low" "AAPL.Close" ...
  Diindeks oleh objek kelas: [Date] TZ: UTC
  Atribut xts:  
List of 2
 $ src    : chr "google"
 $ updated: POSIXct[1:1], format: "2017-02-23 14:16:55"

Gunakan setSymbolLookup() untuk argumen lain

setSymbolLookup(MSFT = list(src = "google", from = "2016-01-01"))

msft <- getSymbols("MSFT", auto.assign = FALSE)
str(msft)  # perhatikan atribut 'src' dan tanggal pertama

Objek ‘xts’ pada 2016-01-04/2017-02-27 berisi:
  Data: num [1:290, 1:5] 54.3 54.9 54.3 52.7 52.4 ...
 - attr(*, "dimnames")=List of 2
  ..$ : NULL
  ..$ : chr [1:5] "MSFT.Open" "MSFT.High" "MSFT.Low" "MSFT.Close" ...
  Diindeks oleh objek kelas: [Date] TZ: UTC
  Atribut xts:  
List of 2
 $ src    : chr "google"
 $ updated: POSIXct[1:1], format: "2017-02-23 14:20:21"

Simpan dan pulihkan default (1)

# Set default
setSymbolLookup(AAPL = "google")

# Verifikasi default berubah
getSymbolLookup()

$AAPL
$AAPL$src
"google"

# Simpan lookup
saveSymbolLookup("symbol_lookup.rda")

# Hapus lookup
setSymbolLookup(AAPL = NULL)

Simpan dan pulihkan default (2)

# Verifikasi default dihapus
getSymbolLookup()

named list()

# Muat lookup
loadSymbolLookup("symbol_lookup.rda")

# Verifikasi default dipulihkan
getSymbolLookup()

$AAPL
$AAPL$src
"google"

Ayo berlatih!

Mengimpor dan Mengelola Data Keuangan di R