R help - Oct 2017 - Skip error in downloading file in loop

I am trying to download data from NASA web-service.

I am using the following code;

for( i in 1:8) {
  target1 <- paste0("
https://hydro1.gesdisc.eosdis.nasa.gov/daac-bin/access/timeseries.cgi?variable=NLDAS:NLDAS_FORA0125_H.002:TMP2m&location=GEOM:POINT(
",
                    cities[i, "lon_nldas"],
                    ",%20", cities[i,"lat_nldas"],

")&startDate=1980-01-01T00&endDate=2016-12-31T23&type=asc2")
  target2 <- paste0("/Users/dasgupta/Dropbox (FEEM)/Flu Paper/climate
data/temperature/nldas/",    # change for whatever destination directory
you may prefer.
                    cities[i,"city"], "_",
                    cities[i,"state"], ".csv")
  download.file(url=target1, destfile=target2,  method = "libcurl")
}

Any time the coordinates provided is out data coverage, the loop fails and
stops. Is there any way to force R to skip the error and continue with the
rest of the download?

My data looks like this:

dput(droplevels(head(cities, 8)))
structure(list(city = structure(1:8, .Label = c("Boston",
"Bridgeport",
"Cambridge", "Fall River", "Hartford",
"Lowell", "Lynn", "New Bedford"
), class = "factor"), state = structure(c(2L, 1L, 2L, 2L, 1L,
2L, 2L, 2L), .Label = c(" CT ", " MA "), class =
"factor"), lon_nldas c(-71.05673836,
-73.19126922, -71.1060061, -71.14364822, -72.67401574, -71.31283992,
-70.82521832, -70.80586599), lat_nldas = c(42.35866236, 41.18188268,
42.36679363, 41.69735342, 41.76349276, 42.64588413, 42.46370197,
41.63767375)), .Names = c("city", "state",
"lon_nldas", "lat_nldas"
), row.names = c(NA, 8L), class = "data.frame")

Any help will be appreciated. Thank you very much!

Sincerely,

Milu

	[[alternative HTML version deleted]]

One of the recommendations in the Posting Guide is to read the archives before
posting... even following along with recent posts would have pointed out the
existence of the tryCatch function.

?tryCatch
-- 
Sent from my phone. Please excuse my brevity.

On October 21, 2017 8:01:02 AM PDT, Miluji Sb <milujisb at gmail.com>
wrote:
>I am trying to download data from NASA web-service.
>
>I am using the following code;
>
>for( i in 1:8) {
>  target1 <- paste0("
>https://hydro1.gesdisc.eosdis.nasa.gov/daac-bin/access/timeseries.cgi?variable=NLDAS:NLDAS_FORA0125_H.002:TMP2m&location=GEOM:POINT(
>",
>                    cities[i, "lon_nldas"],
>                    ",%20", cities[i,"lat_nldas"],
>
>")&startDate=1980-01-01T00&endDate=2016-12-31T23&type=asc2")
>  target2 <- paste0("/Users/dasgupta/Dropbox (FEEM)/Flu
Paper/climate
>data/temperature/nldas/",    # change for whatever destination
>directory
>you may prefer.
>                    cities[i,"city"], "_",
>                    cities[i,"state"], ".csv")
>  download.file(url=target1, destfile=target2,  method =
"libcurl")
>}
>
>Any time the coordinates provided is out data coverage, the loop fails
>and
>stops. Is there any way to force R to skip the error and continue with
>the
>rest of the download?
>
>My data looks like this:
>
>dput(droplevels(head(cities, 8)))
>structure(list(city = structure(1:8, .Label = c("Boston",
"Bridgeport",
>"Cambridge", "Fall River", "Hartford",
"Lowell", "Lynn", "New Bedford"
>), class = "factor"), state = structure(c(2L, 1L, 2L, 2L, 1L,
>2L, 2L, 2L), .Label = c(" CT ", " MA "), class =
"factor"), lon_nldas >c(-71.05673836,
>-73.19126922, -71.1060061, -71.14364822, -72.67401574, -71.31283992,
>-70.82521832, -70.80586599), lat_nldas = c(42.35866236, 41.18188268,
>42.36679363, 41.69735342, 41.76349276, 42.64588413, 42.46370197,
>41.63767375)), .Names = c("city", "state",
"lon_nldas", "lat_nldas"
>), row.names = c(NA, 8L), class = "data.frame")
>
>Any help will be appreciated. Thank you very much!
>
>Sincerely,
>
>Milu
>
>	[[alternative HTML version deleted]]
>
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