Calculate the N50, N90 values for a fasta or 2bit file.
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.
An integer value of N50 or N90 value.
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