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Re: select 1st column element based on criteria in 2nd AND 3rd column

  • To: mathgroup at smc.vnet.net
  • Subject: [mg124507] Re: select 1st column element based on criteria in 2nd AND 3rd column
  • From: Tomas Garza <tgarza10 at msn.com>
  • Date: Sun, 22 Jan 2012 07:21:32 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Your idea is good, but the syntax is not. Try:
In[5]:== Select[pairs, 5 >= #[[2]] >= 3 && 10 >= #[[3]] >= 7 &]Out[5]==
 {{5, 3, 9}}The double ampersand "&&" means "And". A single ampersand "&" means "Function".
-Tomas
> Date: Sat, 21 Jan 2012 05:20:05 -0500
> From: hanciong at gmail.com
> Subject: select 1st column element based on criteria in 2nd AND 3rd column
> To: mathgroup at smc.vnet.net
>
> Hello all, suppose I have a table:
>
> pairs = {{1, 3, 4}, {2, 4, 6}, {3, 6, 7}, {4, 1, 8}, {5, 3, 9}, {6, 2,
>     10}, {7, 5, 11}, {8, 2, 13}, {2, 3, 4}, {5, 6, 7}}
>
> how to select rows for which the 2nd column is between 3 and 5, AND
> the 3rd column is between 7 and 10? So I want to do something similar
> to this:
>
> Select[pairs, 5 >= #[[2]] >= 3 &  AND  10 >= #[[3]] >= 7]
>
> but I just couldn't get it to work. what should I do? Thank you
>


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