R: Reshape data frame to wide format

reshapeWide-deprecated {base} | R Documentation

## Reshape data frame to wide format

### Description

(EXPERIMENTAL). Convert data frame with repeated measurements in long format, 1 row per observation to wide format with repeated observations in multiple variables across rows.

### Usage

    reshapeWide(x, i=reshape.i, j=reshape.j,
                val=reshape.v, jnames=levels(j))

### Arguments

`x` | The data frame to convert
`i` | Factor or numeric. Indicates observations in same row of the wide format
`j` | Factor or numeric. Indicates observations in same column of wide format
`val` | Value to reshape for.
`jnames` | Names of new variables in reshaped frame

### Details

`val`, `i`, and `j` are interpreted relative to `x`. This essentially places the values of `val` in a table defined by `i` and `j`, which are assumed to span the data set (exactly one observation in each cell of their cross-tabulation). Any other variables in the data frame will be assumed to have the same value for all values of `j` (given `i`) and are collapsed into a single value.

### Value

The reshaped data frame.

### WARNING

There is no check that the names given to the new columns are valid identifiers or unique within the data frame. Variables in `x` are not checked to have constant values given `i`.

### Bugs

There ought to be a way to have multiple `val` variables.

### Note

The defaults are set to use the names that result from a call to `reshapeLong`.

### See Also

`reshapeLong`, `unstack`

### Examples

    dd<-as.data.frame(matrix(1:24,4))
    (dd1<-reshapeLong(dd,V3:V5))
    reshapeWide(dd1)
    reshapeWide(dd1,jnames=c("A","B","C"))

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