r - Error reading csv files from an URL in Markdown -


i trying download data bank of england website charts. use read.csv in script below , works fine when run in r console.

    require(xts) require(performanceanalytics) url <-  "http://www.bankofengland.co.uk/boeapps/iadb/fromshowcolumns.asp?csv.x=yes&datefrom=01/jan/1975&dateto=now &seriescodes=xudlusg,xudlerg&csvf=tn&usingcodes=y&vpd=y&vfd=n"  datamat <- read.csv(url) datamat <- na.omit(datamat) rownames(datamat) <- as.date(datamat$date,format = "%d %b %y") datamat <- datamat[,2:3]  datamat <- na.omit(as.xts(datamat)) chart.timeseries(datamat,main="") 

however when trying generate report using markdown following error:

error in file(file, "rt") : cannot open connection calls: ... withvisible -> eval -> eval -> read.csv -> read.table -> file execution halted

the code use same above aside markdown

```{r  getboedata }  require(xts) require(performanceanalytics) url <-  "http://www.bankofengland.co.uk/boeapps/iadb/fromshowcolumns.asp?csv.x=yes&datefrom=01/jan/1975&dateto=now &seriescodes=xudlusg,xudlerg&csvf=tn&usingcodes=y&vpd=y&vfd=n"  datamat <- read.csv(url) datamat <- na.omit(datamat) rownames(datamat) <- as.date(datamat$date,format = "%d %b %y") datamat <- datamat[,2:3]  datamat <- na.omit(as.xts(datamat)) chart.timeseries(datamat,main="")   ``` 


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