# Subset species based on relative frequency

`sub.sp.matrix.Rd`

Subset species based on relative frequency.

    sub.sp.matrix(spmatrix, freq = 0.5, common = NULL)

## Arguments

spmatrix | a standard community matrix with rows representing sites and columns representing species.
freq | The relative frequency, species with higher relative frequency will be kept in the output.
common | The number of most common species to keep.

## Details

sub.sp.matrix will select the species whose relative frequency above 0.5 (default), or select certain number of species based on relative frequency.

## Value

A subset matrix of species with high relative frequency.

## References

None

## Author

Jinlong Zhang jinlongzhang01@gmail.com

## See also

See Also `subset`

## Examples

    library(vegan)
    data(BCI)
    ## Select the species whose relative frequency
    ## more than 0.5, from BCI data
    sub <- sub.sp.matrix(BCI, freq = 0.5)
    ## Select the top 30 species according to relative frequency
    sub <- sub.sp.matrix(BCI, common = 30)