Index - R
| Random | Random | 
| random | Random | 
| RandomGen | Random | 
| randomIO | Random | 
| randomR | Random | 
| randomRIO | Random | 
| randomRs | Random | 
| randoms | Random | 
| range | Ix, Array | 
| rangeSize | Ix, Array | 
| Ratio | Ratio | 
| Rational | Prelude, Ratio | 
| Read | Prelude | 
| read | Prelude | 
| readable | Directory | 
| readDec | Numeric | 
| readFile | Prelude, IO | 
| readFloat | Numeric | 
| readHex | Numeric | 
| readInt | Numeric | 
| readIO | Prelude, IO | 
| readList | Prelude | 
| readLitChar | Char | 
| readLn | Prelude, IO | 
| ReadMode | IO | 
| readOct | Numeric | 
| readParen | Prelude | 
| ReadS | Prelude | 
| reads | Prelude | 
| readSigned | Numeric | 
| readsPrec | Prelude | 
| ReadWriteMode | IO | 
| Real | Prelude | 
| RealFloat | Prelude | 
| RealFrac | Prelude | 
| realloc | MarshalAlloc | 
| reallocArray | MarshalArray | 
| reallocArray0 | MarshalArray | 
| reallocBytes | MarshalAlloc | 
| realPart | Complex | 
| realToFrac | Prelude | 
| recip | Prelude | 
| RelativeSeek | IO | 
| rem | Prelude | 
| removeDirectory | Directory | 
| removeFile | Directory | 
| renameDirectory | Directory | 
| renameFile | Directory | 
| repeat | Prelude, List | 
| replicate | Prelude, List | 
| resetErrno | CError, CForeign | 
| return | Prelude, Monad | 
| reverse | Prelude, List | 
| Right | Prelude | 
| rotate | Bits | 
| rotateL | Bits | 
| rotateR | Bits | 
| round | Prelude |