Replace <NA> Values with Nearest Above Values

The function replaces <NA> values with the nearest values above them in the same column.

Usage

fill.na(x)

Arguments

x

a vector, a matrix or a data frame.

Details

This function is useful when converting a 'notebook style' data into an 'stcs' object. The 'notebook style' data means that observations are registered in a non-redundant way, e.g. when typing in a spreadsheet.

Value

A matrix or a data frame.

References

S\'olymos P. (2008) mefa: an R package for handling and reporting count data. Community Ecology 9, 125--127.

S\'olymos P. (2009) Processing ecological data in R with the mefa package. Journal of Statistical Software 29(8), 1--28. doi:10.18637/jss.v029.i08

http://mefa.r-forge.r-project.org/

Author

P\'eter S\'olymos, solymos@ualberta.ca

Note

This function is not vectorized, so can be a bit slow for large data sets.

See also

stcs

Examples

x <- data.frame(
    samp = c("s1",NA,"s2",NA,"s3","s4"),
    taxa = c("t1",NA,"s1","s2","s3",NA),
    count = c(1, 2, 10, 3, 4, 1),
    segm = c("male","female","male","female","male","male"))
x
#>   samp taxa count   segm
#> 1   s1   t1     1   male
#> 2 <NA> <NA>     2 female
#> 3   s2   s1    10   male
#> 4 <NA>   s2     3 female
#> 5   s3   s3     4   male
#> 6   s4 <NA>     1   male
fill.na(x)
#>   samp taxa count   segm
#> 1   s1   t1     1   male
#> 2   s1   t1     2 female
#> 3   s2   s1    10   male
#> 4   s2   s2     3 female
#> 5   s3   s3     4   male
#> 6   s4   s3     1   male
fill.na(c(1:4, NA))
#> [1] 1 2 3 4 4