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Home/ Questions/The easy way to handle error - trying to use cran without setting a mirror
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Rose Jourdain
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Rose Jourdain
Asked: May 18, 20222022-05-18T10:20:40+00:00 2022-05-18T10:20:40+00:00In: r

The easy way to handle error – trying to use cran without setting a mirror

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..3..

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Here is the program I run:

install.packages("weatherData")
 library(weatherData)
 istanbul <- getWeatherForDate("Istanbul",
  start_date = Sys.Date() - 41, 
  end_date = Sys.Date())

After I run, it returns an error:

Quitting from lines 3-31 (ist_weather.spin.Rmd) 
 Error in contrib.url(repos, type) : 
  trying to use CRAN without setting a mirror
 Calls: <Anonymous> ... eval -> eval -> install.packages -> grep -> contrib.url
 Execution halted

Does anyone have any suggestions for the problem below: trying to use cran without setting a mirror in the r. How to correct it?

use cran without setting a mirror
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    hdtutoria Expert
    2022-06-06T02:42:21+00:00Added an answer on June 6, 2022 at 2:42 am

    The cause: The cause of this error perhaps due to forget about setting up CRAN for each R session.

    The solution: To solve this error, you might use a mirror as a install.packages argument:

    install.packages("weatherData",repos = "http://cran.us.r-project.org")

    Beside, default CRAN mirror can be set up in your .Rprofile.

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  2. Ethan Peltier
    2022-05-25T20:13:17+00:00Added an answer on May 25, 2022 at 8:13 pm

    Set the CRAN repository within your R. Launch R or RStudio. Run the following codes in R terminal.

    r = getOption("repos")
    r["CRAN"] = "http://cran.us.r-project.org"
    options(repos = r)
    install.packages("weatherData")

    The above code defines CRAN repository for R. In the next package installation, there is no need to redefine it again.

    Another alternative is to run install.packages("weatherData", repos="http://cran.us.r-project.org"). The second solution does not work and the repository must be set. You will need to pass this parameter with every package installation.

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