Look up the Stan function that corresponds to a R function or name.
Description
This function helps to map between R functions and Stan functions.
Usage
1 
Arguments
FUN 
A character string naming a R function or a R function for
which the (near) equivalent Stan function is sought. If no matching
R function is found, 
ReturnType 
A character string of positive length naming a valid
return type for a Stan function: 
Value
Ordinarily, a data.frame with rows equal to the number of partial matches and four columns:

StanFunction
Character string for the Stan function's name. 
Arguments
Character string indicating the arguments to that Stan function. 
ReturnType
Character string indicating the return type of that Stan function. 
Page
Integer indicating the page of the Stan reference manual where that Stan function is defined.
If there are no matching Stan functions, a character string indicating so is returned.
References
The Stan Development Team Stan Modeling Language User's Guide and Reference Manual. http://mcstan.org/.
The Stan Development Team CmdStan Interface User's Guide. http://mcstan.org.
Examples
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