Hmmm... usually folks ask questions about why their program isn't working. You already seem to understand why it isn't working. I have no idea what "complete linkage clustering" is, but you have already provided the errors above... so fix 'em and you will be on your way. In particular,

• 'weight' is pointing to an empty string... change it to an array as required.
• 'transpose' is pointing to an empty string... change it to 0 or 1.
• 'mask' is pointing to an empty string. Correct that.
• 'data' seems to be ok... it _is_ pointing to an arrayref... check @m and see if it is what the program expects.

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