[R] String Manipulation in R

Hi , Is there any inbuilt functions to check whether a substring is present in a string and give the result as boolean Thanks -- View this message in context: http://r.789695.n4.nabble.com/String-Manipulation-in-R-tp4633104.html Sent from the R help mailing list archive at Nabble.com. __

[R] trouble using optim for maximalisation of 2-parameter function

s: mu=3 and sigma=2.366 [This I calculated by hand to compare with the output] but in stead of output I get an error: Error in fn(par, ...) : argument "theta" is missing, with no default I don't understand why this happened? I hope someone can help me with this for I am still a [R]oo

[R] request for code

Hi, I want to convert my MATLAB programs to R studio programs. Kindly guide on the same. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEA