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我試圖檢索與SP500數據:檢索數據 'quantmod' 包
SP500 <- getSymbolsundefined"^GSPC", from ="2000-01-01", to = "2016-08-31", auto.assign = FALSE)
但我得到了以下錯誤:
Error: unexpected string constant in "SP500 <- getSymbolsundefined"^GSPC""
有什麼建議?