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MathGroup Archive 1998

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Re: List handling

  • To: mathgroup at smc.vnet.net
  • Subject: [mg15287] Re: [mg15261] List handling
  • From: BobHanlon at aol.com
  • Date: Thu, 31 Dec 1998 04:39:40 -0500
  • Sender: owner-wri-mathgroup at wolfram.com

In a message dated 12/30/98 3:30:01 AM, jzickermann at mail.EUnet.pt
writes:

>listA= 
>
>{1977.06,1977.06,1977.06,1977.06,1977.06,2047.77,2047.77,2047.77,2047.77,218
>1.55,2181.55,2181.55,2244.73,2244.73,2244.73,2305.5,2305.5,2305.5,2305.5,236
>3.92,2363.92,2363.92,2363.92,2363.92,2363.92,2363.92,2363.92,2363.92,2363.92
>,2363.92}
>
>ListB= 
>
>{0.684807,0.683029,0.665242,0.665242,0.664123,0.683029,0.665242,0.665242,0.6
>64123,0.640339,0.640339,0.620329,0.640339,0.640339,0.620329,0.661684,0.64033
>9,0.640339,0.620329,0.640339,0.622044,0.640339,0.621506,0.660996,0.640339,0.
>641006,0.640339,0.620935,0.640339,0.640339}
>
>ListC=
>
>{1971.45,1973.53,1994.29,1994.29,1995.6,2044.23,2065.,2065.,2066.3,2227.86,2
>227.86,2251.22,2291.04,2291.04,2314.4,2326.89,2351.81,2351.81,2375.17,2410.2
>2,2431.58,2410.22,2432.21,2386.11,2410.22,2409.44,2410.22,2432.88,2410.22,24
>10.22}
>
>Position[ListB,_?(#>0.68&)]
>
>{{1},{2},{6}}
>
>Having obtained the positions of certain selected elements from ListB,
>I
>want to substitute the corresponding elements in ListA by the
>corresponding elements in ListC. In other words, I want to end up with;
>
>listA= 
>
>{1971.45,1973.53,1977.06,1977.06,1977.06,2044.23,2047.77,2047.77,2047.77,218
>1.55,2181.55,2181.55,2244.73,2244.73,2244.73,2305.5,2305.5,2305.5,2305.5,236
>3.92,2363.92,2363.92,2363.92,2363.92,2363.92,2363.92,2363.92,2363.92,2363.92
>,2363.92}
>

ListA = If[#[[2]] > 0.68, #[[3]], #[[1]]]& /@ Transpose[{ListA, ListB,
ListC}]


Bob Hanlon


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