Unfortunately, not all packages are available across platforms. This goes back to step 5. If possible, try to find a way to handle a different OS by switching to an appropriate flavor of a package or switch off the dependency in certain cases. Useful considerations to be sure, but more an answer for "Why do I get an error when installing a package". DWin: Maybe, but not really. I may have been unclear.
These issues come up when a job grinds to a halt on a grid because a package wasn't installed. Maintaining software consistency on a grid isn't hard, but does require a good process for installation, maintenance, and debugging. These are just some of the items that come up from each phase, at least as they relate to the screaching sound that comes when a function isn't available.
Any suggestions to what I could do if I get the error while using a package I didn't write? The package itself seems to want to use an internal method that isn't defined because presumably the author didn't do the above.
This happened to me because I forgot to add export to the the Roxygen2 front matter before my function definition. I had the error Error: could not find function some. I found adding exportPattern ". You better use roxygen2, that one recognizes edits you make to the namespace files and keeps them intact. I'd also advise strongly against using exportPattern ". Use the tag export instead in your individual files, so you only export the functions that need exporting.
Roxygen2 will automatically update the namespace to export all functions that need exporting. You may be able to fix this error by name spacing :: the function call comparison. The error says "comparision" instead of"comparison".
I reckon the namespace wasn't the problem :- — Joris Meys. Good spot Joris Meys — Tony Cronin. Akshay Vijay Jain. Could you please elaborate on what the nature was of the error. This might help, but only in very specific cases.
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Leave new. Regards, Joachim. Hey Nara, As promised, I have produced a series of tutorials on the dplyr package. Muchas gracias por todo el material que publican. Un gran trabajo. Muchas gracias Oreste! Nice to hear your positive feedback! Hi Ali, Thank you for the suggestion! Hey Cessar, Thanks a lot for the nice feedback! Hi Cristo, Thank you for your comment and your thoughts. Hola Denny, Thanks a lot for these additional thoughts.
I definitely agree with what you said. Also, thank you very much for the kind words! Greetz Simon. Hey Simon, Thanks a lot for the kind words and the feedback! Hey Joachim, Very useful content.
Hey Vijeyachander, Thank you very much for the kind words! Hi Juho, Thanks a lot for the feedback! Regards Joachim. Hey Angus, Indeed, the class function should be on this list.
This is handy sometimes, but should be avoided in usual case, especially when you matrix is big. Otherwise the best way is debugging and using " jump into ":. View mean Make sure to use uppercase [V]. The read-only code will open in the editor. You can also try to use print. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How can I view the source code for a function? Ask Question. Asked 8 years, 1 month ago.
Active 3 months ago. Viewed k times. In still other cases, there's a bit of R code, but most of work seems to be done somewhere else. Internal function call.
Primitive ". Primitive function name. Primitive" How do I find out what the. Improve this question. MichaelChirico 32k 13 13 gold badges 99 99 silver badges bronze badges. Joshua Ulrich Joshua Ulrich k 29 29 gold badges silver badges bronze badges.
See also stackoverflow. Add a comment. Active Oldest Votes. The S3 method dispatch system For S3 classes, you can use the methods function to list the methods for a particular generic function or class.
It is possible to combine the download and expansion step into a single call note that only one package at a time can be downloaded and unpacked in this way : untar download.
Compiled code in a base package Certain packages are considered "base" packages. Improve this answer. If you use RStudio , it will attempt to pull the source for the function your text cursor is over if you press the F2 key. Ari B. Friedman Sorry for this late question. Will RStudio also pull the C source code for the function or just for the functions written in R? Thanks — Sunny. Samir I believe it's just the R source. Alas getMethod is deprecated and not longer available. The help file for findMethods which replaced it does not show how to get the source code for S4 methods.
Show 4 more comments. View is great for browsing multi-columnar data , but usually terrible for code of anything other than toy length. Admittedly, getAnywhere is another wacky R choice of name for something which should have been called findOnSearchPath or similar. I'll upvote this answer because it got me close to what I wanted. Syntax Rules for Functions General. A function name needs to be assigned to call the function see below. Function names can be almost anything. However, the usage of names of existing functions should be avoided.
It is often useful to provide default values for arguments e. This way they don't need to be provided in a function call. The argument ' The individual commands are separated by semicolons or new lines preferred.
Functions are called by their name followed by parentheses containing possible argument names. Empty parenthesis after the function name will result in an error message when a function requires certain arguments to be provided by the user. The function name alone will print the definition of a function. Variables created inside a function exist only for the life time of a function. Thus, they are not accessible outside of the function. If a global variable is used in a function, then the global variable will be masked only within the function.
The evaluation flow of a function may be terminated at any stage with the return function. This is often used in combination with conditional evaluations. To stop the action of a function and print an error message, one can use the stop function. To print a warning message in unexpected situations without aborting the evaluation flow of a function, one can use the function warning " Regular Expressions R's regular expression utilities work similar as in other languages.
To learn how to use them in R, one can consult the main help page on this topic with? The following gives a few basic examples. The grep function can be used for finding patterns in strings, here letter A in vector month.
Calling External Software with System Command. Miscellaneous Utilities. Table of Content. R or just. R [outfile]. Here is a short R script that generates the required files and directories automatically and submits the jobs to the nodes: submit2cluster. This package provides one of the most advanced resources for submitting jobs to queuing systems from within R. A related package is BiocParallel from Bioconductor which extends many functionalities of BatchJobs to genome data analysis.
R" Loads configuration file. R containing just this line: cluster. Output files from R will be stored under directory "results", while the standard objects from BatchJobs will be stored in the directory "BatchJobTest-files".
RData loadResult reg, 1. Table of Contents The setClass function defines classes. Its most important arguments are. Table of Contents Its arguments are:. Usage should be limited to internal functions!
GlobalEnv"] Slots: Name: a b c d Class: character character numeric numeric Extends: "myclass1", "myclass2". Table of Contents H Functions to introspect classes. Table of Contents B. R", "script2. Note: this is an optional but very convenient function to get started with a new package.
The basic structure of the package directory is described here.
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