fINDexers | R Documentation |

Find row or column by name or index

Column by name or index

Row by name or number

Matrix cell index by name or number

Return all indices of a (range of) values

Is element of... with multiple input types

c %ci% d r %ri% d rc %mi% d nv %ai% d x %e% y

`c` |
Column name or index |

`d` |
A named vector, list, matrix, or data frame |

`r` |
Row name or index |

`rc` |
A 2-element numeric or character vector representing |

`nv` |
A numeric value, or vector of values of which you want to know the indices in |

`x` |
A vector, data frame or list containing numbers and/or characters that could be elements of y |

`y` |
An object that could contain values in x |

If `r/c/rc`

is numeric, the name corresponding to the row/column index of `d`

, if `r/c/rc`

is a character vector, the row/column index corresponding to the row/column name. If `dimnames(d) == NULL`

, but `names(d) != NULL`

then `%ci%`

and `%ri%`

will look up `r/c`

in `names(d)`

Logical vector indicating which x are an element of y

Fred Hasselman

# data frame d <- data.frame(x=1:5,y=6,row.names=paste0("ri",5:1)) "y" %ci% d # y is the 2nd column of d 2 %ci% d # the name of the second column of d is "y" 2 %ri% d "ri5" %ri% d # change column name colnames(d)["y" %ci% d] <- "Yhat" # mi works on data frames, matrices, tiblles, etc. c(5,2) %mi% d list(r="ri1",c=2) %mi% d # matrix row and column indices m <- matrix(1:10,ncol=2, dimnames = list(paste0("ri",0:4),c("xx","yy"))) 1 %ci% m 5 %ci% m # no column 5 1 %ri% m 5 %ri% m c(5,1)%mi%m c(1,5)%mi%m # For list and vector objects ri and ci return the same values l <- list(a=1:100,b=LETTERS) 2 %ci% l "a" %ci% l 2 %ri% l "a" %ri% l # named vector v <- c("first" = 1, "2nd" = 1000) "2nd" %ci% v 1 %ci% v "2nd" %ri% v 1 %ri% v # get all indices of the number 1 in v 1 %ai% v # get all indices of the number 3 and 6 in d c(3,6) %ai% d # get all indices of values: Z < -1.96 and Z > 1.96 Z <- rnorm(100) Z[Z%)(%c(-1.96,1.96)] %ai% Z

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