replace
Replace Values in a Vector
replace replaces the values in x
with indices given in list by those given in values.
If necessary, the values in values are recycled.
- Keywords
- manip
Usage
replace(x, list, values)Arguments
- x
vector
- list
an index vector
- values
replacement values
Value
A vector with the values replaced.
Note
x is unchanged: remember to assign the result.
References
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
Community examples
`replace` replaces values in an existing vector ```{r} replace( letters, c(1, 5, 9, 15, 21), c("A", "E", "I", "O", "U") ) ``` You need to assign the result to a new variable – the original variable isn't overwritten ```{r} letters # same as it originally was ``` You can use other methods of indexing (negative integers, logical values and names) for the `list` argument. Replacement values are recycled. ```{r} replace(month.abb, -c(2, 4, 6, 9, 11), "31 days") ``` `replace` also works on lists ```{r} (l <- list( a = rbinom(20, 10, 0.5), b = "this element needs replacing" )) replace(l, "b", "that's better") ``` It even works on data frames. One use is to add columns (though `with` and `within` and `dplyr::mutate` are better at this). ```{r} trees replace(trees, 4, seq_len(nrow(trees))) ```