Error in tryCatch doesn't work

[hohenc]

Hey guys,

I want to get data by using my GetRemoteData-Function. Sometimes data isn't available, an Error occurs and R stops running my code. In that case I want to use a tryCatch to go on. My code lookes like this:

  tryCatch({
        
        data <- GetRemoteData(source = "Montel", requestType = "trade", fromDate = today, toDate = "",v.ids = c("EEX DEB WKND0"), nRetry = 0)
        
      }, 
      
      error = function(data) {
        
        matrix <- matrix(1:9, nrow = 3, ncol = 3)
       

      })

It works fine when the data is available. But when it's not, no matrix was created or rather the matrix doesn't exist outside the tryCatch. Why?

Greets Christina

[nirgrahamuk]

tell the error function what to return :

tryCatch({
  
  data <- GetRemoteData(source = "Montel", 
                        requestType = "trade", 
                        fromDate = today, 
                        toDate = "",
                        v.ids = c("EEX DEB WKND0"), 
                        nRetry = 0)
}, 
error = function(data) {
  matrix <- matrix(1:9, nrow = 3, ncol = 3)
  matrix 
})

If a function is to return a value, that value should be the last thing before exiting the function, your error function assigned a matrix to a variable 'matrix' but then didnt return it. Naming it, doesnt seem worthwhile so better code might be

tryCatch({
  
  data <- GetRemoteData(source = "Montel",
                        requestType = "trade", 
                        fromDate = today,
                        toDate = "",
                        v.ids = c("EEX DEB WKND0"), 
                        nRetry = 0)
}, 
error = function(data) {
  matrix(1:9, nrow = 3, ncol = 3)
})

[hohenc]

Oh, thank you! Now it works!!!!