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Re: How to get elements satisfying specific condition from a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg123400] Re: How to get elements satisfying specific condition from a list
  • From: Adriano Pascoletti <adriano.pascoletti at uniud.it>
  • Date: Mon, 5 Dec 2011 05:17:31 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

In[3]:= Cases[B, {x_Integer, y_Integer} /; x + y > 9, {2}]
Out[3]= {{4, 6}, {5, 5}, {5, 6}, {6, 4}, {6, 5}, {6, 6}}


Adriano Pascoletti

2011/12/4 e-changb <e-changb at hanmail.net>

> Hi, please help me if you can.. Let
>
> B:= Table[{x, y}, {x, 1, 6}, {y, 1, 6}]
>
> It is clear that B has 36 elements.
>
> I want to get the list of elements satisfying
> 'the first component + second component is bigger than 9'
>
> so that the answer is
>
> {{5,5},{5,6},{6,5},{6,6}}.
>
> In fact, I have no idea for following even simpler problem. : Let A be a
> set of all natural numbers less than 10. Find every element whose squre
> root is bigger than 2. (needless to say the answer is {5,6,7,8,9})
>
> Can you help me ?
>
>


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