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I want to rotate a series points around a spatial line


Dear friends;

How are you!
I want to rotate a series points around a line, for
example,ptset={{0,0},{5,5},{2,5},{7,9}};
the line goes through {1,1,1} and {4,5,7}, I want to
rotate the ptset around the line for t angle, 
what should I do?

Thank you very much!

Liwen
e-mail: gzgear at yahoo.com

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