I don't find the help page for the `replace`

function from the `base`

package to be very *helpful*. Worst part, it has no examples which could help understand how it works.

Could you please explain how to use it? An example or two would be great.

This question is related to
`r`

If you look at the function (by typing it's name at the console) you will see that it is just a simple functionalized version of the `[<-`

function which is described at `?"["`

. `[`

is a rather basic function to R so you would be well-advised to look at that page for further details. Especially important is learning that the index argument (the second argument in `replace`

can be logical, numeric or character classed values. Recycling will occur when there are differing lengths of the second and third arguments:

You should "read" the function call as" "within the first argument, use the second argument as an index for placing the values of the third argument into the first":

```
> replace( 1:20, 10:15, 1:2)
[1] 1 2 3 4 5 6 7 8 9 1 2 1 2 1 2 16 17 18 19 20
```

Character indexing for a named vector:

```
> replace(c(a=1, b=2, c=3, d=4), "b", 10)
a b c d
1 10 3 4
```

Logical indexing:

```
> replace(x <- c(a=1, b=2, c=3, d=4), x>2, 10)
a b c d
1 2 10 10
```

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- [Move to "replace" function examples]