Calculate 1**2 + 2**2 + 3**2 + ...

• Calculate 1**2 + 2**2 + 3**2 + ...

  This is sample output - yours may be different.

  
  

  2
  seq -f"%g^2" -s "+" 10 | bc
  sraeder · 2011-02-12 23:35:57 1
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• Calculate 1**2 + 2**2 + 3**2 + ...

  Simplified the series to a polynomial and send it to bc

  This is sample output - yours may be different.

  
  

  0
  N=10; echo "($N*($N+1)*(2*$N+1))/6" | bc
  PhillipNordwall · 2011-02-15 20:02:57 0
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I like your use of the seq separator, but this time it doesn't quite work. You can replace rev, cut, rev with sed: seq -s^2+ 11 | sed 's/$/^2/' | bc or go back to sed and paste seq 11 | sed 's/$/^2/' | paste -sd+ | bc These also mean that "seq N" gives the sum to N^2.

flatcap · 792 weeks and 4 days ago

With some math python -c 'n=10;print n*(n+1)*(2*n+1)/6'

sarcilav · 792 weeks and 4 days ago

The same idea, but with echo and bc echo 'n=10;n*(n+1)*(2*n+1)/6'|bc

sarcilav · 792 weeks and 4 days ago

Thanks flatcap! I shoud have think o adding a trailing ^2 :S.

rubenmoran · 792 weeks and 4 days ago

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