Several features benefit from being customizable — either because of personal taste or specifics of the environment. The way R implements this flexibility is set optionserror=recover the options function. This both sets and reports options. For example, we can see the names of the options that are set by default:.
Notice set optionserror=recover the last few digits are noise as per Circle 1 of The R Inferno. A sort of related option is scipen — this controls which numbers are printed in scientific notation. The width option says how many characters R should put on a line. If you get responses from R that look set optionserror=recover, it could be that width is larger than it should be.
This was not in the list above because its default value is NULL. That is the wrong value for almost all people almost all of the time. There are at least two better values. The important difference is that with recover you are thrown into the debugger automatically if possible when you encounter an error.
In contrast you need to call debugger yourself if you use dump. Of course in the examples here there is nothing to debug, but if this were a real emergency, then you set optionserror=recover be presented with a stack of frames any of which you could enter set optionserror=recover explore. If you intend to change an option but misspell it, then you have added a new option instead of changing the old one. Page 45 of S Poetry has a function set optionserror=recover warns set optionserror=recover if you are adding any options.
That function would almost work in R except withVisible would be used instead of. You set optionserror=recover not restricted to the existing options. You can use a new set optionserror=recover of your choosing. Options are usually not necessary for things that only impact one function — an argument with a default suffices in that setting.
Suppose we want to use a new option set optionserror=recover leave. A typical idiom is:. Patrick, Would you mind to elaborate on scipen? This is part of my R childhood traumas, especially when printing an lm summary set optionserror=recover a lot of figures in scientific notation.
The idea is that scipen is a penalty regarding how much space is used with and without scientific notation. Here is an example that might set optionserror=recover. Patrick, Thanks for the examples.
Then we have to set optionserror=recover the error so that action […]. Your email address will not be published.
Notify me of follow-up comments by email. Notify me of new posts by email. The options mechanism in R 02 Mar Basics Several features benefit from being customizable — either because of personal taste or specifics of the environment. For example, we can see the names of the options that are set by default: We can change it: This takes the values: The first better value is dump.
The second better value is recover: Programming You are not restricted to the existing options. A typical idiom is: It is used like: Plot ranges of data in R R database interfaces The three-dots construct in R A corner on convenient data analysis Tags: Here is an example that might help: There really is set optionserror=recover — it is just non-trivial to spot. Thnaks a lot for the scipen explanation! An R debugging example set optionserror=recover Burns Statistics says: Blog recap of - Burns Statistics says: Leave a Reply Want to join the discussion?
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