Calculate the N50, N90 values for a fasta or 2bit file.
Usage
N50(filepath)
N90(filepath)
Arguments
filepath
The path name of a fasta or 2bit file.
Value
An integer value of N50 or N90 value.
Details
This function calculates the N50, N90 values for an assembly.
The N50 value is calculated by first ordering every contig/scaffold by length
from longest to shortest.
Next, starting from the longest contig/scaffold, the lengths of each contig
are summed, until this running sum equals one-half of the total length of
all contigs/scaffolds in the assembly.
Then the length of shortest contig/scaffold in this list is the N50 value.
Similar procedure is used for N90 but including 90% of the assembly.