R can't find function after installing package

Question

I'm trying to use the function isdigit but R can't find it, even after I installed the qmrparser package and submitted the code library(qmrparser).

(I'm brand new to R so please explain like I'm 5!)

I had marked this as a duplicate, then changed my mind. Here's the link http://stackoverflow.com/questions/7027288/error-could-not-find-function-in-r. There's a lot of good information there that might help you. — Rich Scriven, Jan 06 '16 at 20:42
@RichardScriven I marked it as off topic since it's just a typo as it should be isDigit instead. — Dason, Jan 06 '16 at 21:04
Either a typo, or a more conceptual 'case does not matter' misunderstanding. — Dirk Eddelbuettel, Jan 06 '16 at 21:17
Yep - I didn't realize that the D needed to be capitalized. Thanks! — Kristin, Jan 07 '16 at 22:01

Dirk Eddelbuettel · Answer 1 · 2016-01-06T20:54:56.250

Try

 library(qmrparser)

to load / attach the package. Failing that, try

 qmrparser::isdigit()

to call it up explicitly using the :: operator along with the package name.

You can have thousands of packages installed, so installed does not automate loading (though you can arrange for that, but that is a different topic).

Edit: And if the function is not accessible even after loading try the 'triple-:' operator to access non-exported sysmbols:

 qmrparser:::isdigit()

Edit 2: Your premise was wrong as the function is called isDigit with a capital-D. So you have to type

 isDigit()

which will get you the function as it is exported via NAMESPACE.

R can't find function after installing package

1 Answers1