В Thu, 22 Aug 2024 13:07:37 -0600 Keith Christian <keith1christ...@gmail.com> пишет:
> I'm interested in R construct(s) to be entered at the command > line that would output slope, y-intercept, and r-squared values read > from a csv or other filename entered at the command line, and the same > for standard deviation calculations, namely the standard deviation, > variance, and z-scores for every data point in the file. If you'd like to script R at the command line, consider the commandArgs() function (try entering ?commandArgs at the R prompt). This way you can pass a file path to an R process without unsafely interpolating it into the R expression itself. These arguments can be given to R --args or to Rscript (without the --args). Also consider the 'littler' scripting-oriented R front-end <https://CRAN.R-project.org/package=littler>, which puts the command line arguments into the 'argv' variable and has a very convenient -d option which loads CSV data from the standard input into a variable named 'X'. > Are line numbers, commas, etc. needed or no? Depends on how you read it. By default, the function read.table() will expect your data to be separated by a mixture of tabs and spaces and will recognise a header if the first line contains one less column than the rest of the file. Enter ?read.table at the R prompt to see the available options (which include read.csv). Good introductions to R include, well, "An Introduction to R" [1] (also available by typing RShowDoc('R-intro') into the R prompt) and "Visual Statistics" by Dr. A. Shipunov [2]. Start with functions read.table(), lm(), scale(), sd(), summary(). Use str() to look at the structure of a variable: summary(lm(...)) will return a named list from which you can extract the values you are interested in (see ?summary.lm). When in doubt, call help(name_of_the_function). -- Best regards, Ivan [1] https://cran.r-project.org/doc/manuals/R-intro.html [2] http://web.archive.org/web/20230106210646/http://ashipunov.info/shipunov/school/biol_240/en/visual_statistics.pdf ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide https://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
