Recent questions tagged R-faq

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I want a way to create a empty data.frame in R, I just want to point out data types for each column and name it without any row created. df...

asked Jan 24, 2022 in Education by JackTerrance

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Q: Run R script from command line

I have file called q.r and it has chmod of 755, how can I run it using a command-line? sayHello...

asked Jan 24, 2022 in Education by JackTerrance

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Q: How do I install an R package from source?

I work on Mac OSX and want to install a RJSONIO package in my R, I am a beginner currently and I have no ... someone explain it to me? Select the correct answer from above options...

asked Jan 24, 2022 in Education by JackTerrance

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Q: How can two strings be concatenated?

How can I merge and combine two values in R? For instance: tmp = cbind("QWE", "RT") tmp # [,1] [,2] # ... ,RT" How can I perform this? Select the correct answer from above options...

asked Jan 24, 2022 in Education by JackTerrance

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Q: Function to clear the console in R and RStudio

I want a function to clear the console in R and RStudio instead of a keyboard function, Can someone tell me any? Select the correct answer from above options...

asked Jan 24, 2022 in Education by JackTerrance

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Q: Elegant way to check for missing packages and install them?

How can I check for missing packages and call for installed.packages() to install them smartly? Select the correct answer from above options...

asked Jan 23, 2022 in Education by JackTerrance

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Q: Sample random rows in dataframe

Can someone tell me a function which can return a specified no. of rows picked randomly without any replacement from a DataFrame in R? Select the correct answer from above options...

asked Jan 23, 2022 in Education by JackTerrance

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Q: How to save a plot as image on the disk?

I am ploating simple linear regression plot in R and I want to save it as JPEG or PNG file, How can I do ... it is, Is it possible? Select the correct answer from above options...

asked Jan 23, 2022 in Education by JackTerrance

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Q: How to write trycatch in R

How to write a trycatch code to sort out an error in web downloading. url...

asked Jan 23, 2022 in Education by JackTerrance

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Q: How can I read command line parameters from an R script?

I want to supply some command-line parameters from a R script I have. And it runs on windows. I just want it ... help me with it? Select the correct answer from above options...

asked Jan 23, 2022 in Education by JackTerrance