Hi everyone,
   
  when I run my script, i received this error:
   
  "floating point exception"
   
  I understood that this error is related to calculating standard of deviation:
  "set standard_deviation [expr sqrt($variance)]"
  I traced variance and found that sometimes it's negative, but I can't 
understand why.logically it should be negative never.
   
  Can anybody help me with this problem?
Thanks in advance.
   
  best regards,
  elahe.

       
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