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The value index in cluster matrices stringifies numbers using sprintf. When the locale uses a comma as the radix char this has knock on effects with the cluster analysis, as values like "0.23" are represented as "0,23", which perl later interprets as "0".
The end result is a cluster analysis with branch reversals (negative branch lengths) when there should be none.
Also throw a fatal exception when we encounter a non-numeric index val.
This second part needs further thought for backwards compatibility.
Updates #742
The value index in cluster matrices stringifies numbers using sprintf. When the locale uses a comma as the radix char this has knock on effects with the cluster analysis, as values like "0.23" are represented as "0,23", which perl later interprets as "0".
The end result is a cluster analysis with branch reversals (negative branch lengths) when there should be none.
Related to #81, #623 and #682
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