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post_install() {
echo "==> The delta matrix is read from the input-file. "
echo "==> It is recommended to put it and the executable in "
echo "==> a special directory. The input-file and output-file "
echo "==> can be given as arguments to the executable by "
echo "==> typing them after the executable (Bionj input-file "
echo "==> output-file) or by typing them when asked by the "
echo "==> program. The input-file has to be formated according "
echo "==> the PHYLIP standard. The output file is formated "
echo "==> according to the NEWSWICK standard. "
echo "==> "
echo "==> The lower-half of the delta matrix is occupied by "
echo "==> dissimilarities. The upper-half of the matrix is "
echo "==> occupied by variances. The first column "
echo "==> is initialized as 0 during the algorithm some "
echo "==> indices are no more used, and the corresponding "
echo "==> positions in the first column are set to 1. "
echo "==> "
echo "==> This delta matix is made symmetrical using the rule: "
echo "==> Dij = Dji <- (Dij + Dji)/2. The diagonal is set to 0 "
echo "==> during the further steps of the algorithm, it is used "
echo "==> to store the sums Sx. "
echo "==> "
echo "==> A second array, trees, is used to store taxon names. "
echo "==> During the further steps of the algoritm, some "
echo "==> positions in this array are emptied while the others "
echo "==> are used to store subtrees. "
}
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