如何在 R 中为此场景编写 trycatch

Question

Currently I have written the ifelse statement to get the correct symbol pattern. But I want to know how I can write tryCatch for this statement? Because sometimes getSymbols returns error if symbol doesn't have correct extension.

getSymbols(
  
  ifelse(
    substring(stocksList[i,1],1,1) == "^" | grepl(".BO", stocksList[i,1]),
    stocksList[i,1] , 
    paste0(stocksList[i,1], ".NS") 
  ),
  
  from = fromDate, 
  to = toDate,
  periodicity = freqStr ,
  return.class = 'zoo',
  env = NULL
)

Answer 1

Have you tried wrapping the complete code inside tryCatch ?

tryCatch({
  getSymbols(ifelse(
    substring(stocksList[i,1],1,1) == "^" |   grepl(".BO", stocksList[i,1]),
    stocksList[i,1] , 
    paste0(stocksList[i,1] , ".NS") 
  ),
  from = fromDate, 
  to = toDate,
  periodicity = freqStr ,
  return.class = 'zoo',
  env = NULL)
  }, 
  error = function(e) message('Cannot download the data')
)