Re: vlookup like function sugestion
- To: mathgroup at smc.vnet.net
- Subject: [mg128808] Re: vlookup like function sugestion
- From: 11lara11 at gmail.com
- Date: Wed, 28 Nov 2012 03:14:14 -0500 (EST)
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On Monday, April 2, 2012 10:25:08 AM UTC+2, Rodrigo Murta wrote:
> When you are used to work with Excel, one big challenge in start
>
> working with Mathematica is to find one way to merge table like
>
> Vlookup does.
>
> I know by my own experience that it's very difficult to handle this in
>
> Mathematica, and I belive that a lot of Excel user get a little bit
>
> frustrated in see that one simple operation like that is so difficult.
>
> I would like to suggest to Mathematica team that the future version
>
> could have some builting in function to handle this situation.
>
> Meanwhile I use the below function that I would like to share with the
>
> community:
>
>
>
> vlookup[data1_, data2_, pk1_: 1, col1_: {2}, pk2_: 1] :=
>
> Module[{look},
>
> look[val_, table_, pk2l_] := Select[table, #[[pk2l]] == val &];
>
> Join[#,
>
> Check[look[#[[pk1]], data2, pk2][[1, col1]],
>
> ConstantArray[Null, Length@col1]] // Quiet] & /@ data1]
>
>
>
> Use example:
>
>
>
> mydata={{"brazil",605,54161,a},{"india",550.92,49505,b},{"china",
>
> 550.92,49505,c},{"russia",752.61,54324,d}};
>
> lookup={{54161,3.2,"rodrigo"},{5434,16.3,"murta"},{49505,12.3,
>
> "daniel"}};
>
>
>
> vlookup[mydata, lookup, 3, {2, 3}]
>
>
>
> {{"brazil", 605, 54161, a, 3.2, "rodrigo"}, {"india", 550.92, 49505,
>
> b, 12.3, "daniel"}, {"china", 550.92, 49505, c, 12.3,
>
> "daniel"}, {"russia", 752.61, 54324, d, Null, Null}}
>
>
>
> vlookup[mydata, lookup, 3]
>
>
>
> {{"brazil", 605, 54161, a, 3.2}, {"india", 550.92, 49505, b,
>
> 12.3}, {"china", 550.92, 49505, c, 12.3}, {"russia", 752.61, 54324,
>
> d, Null}}
>
>
>
>
>
> Best Regards
>
> Murta
>
> PS: there is an topic about this in 2008
>
> http://groups.google.com/group/comp.soft-sys.math.mathematica/browse_thread/thread/8116b7eb264bb20a/e3299e06272ab379?hl=en&lnk=gst&q=vlookup#e3299e06272ab379
Thank you so much. This is exactly what I was looking for.