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Re: How to make {f,g}[a,b,c] to become {{f[a],g[a]},{f[b],g[b]},{f[c],g[c]}}

  • To: mathgroup at smc.vnet.net
  • Subject: [mg105318] Re: How to make {f,g}[a,b,c] to become {{f[a],g[a]},{f[b],g[b]},{f[c],g[c]}}
  • From: Szabolcs Horvát <szhorvat at gmail.com>
  • Date: Sat, 28 Nov 2009 01:04:29 -0500 (EST)
  • References: <heoe15$4ph$1@smc.vnet.net>

On 2009.11.27. 12:43, Lawrence Teo wrote:
> I have a question. How to make {f,g}[a,b,c] to become {{f[a],g[a]},{f
> [b],g[b]},{f[c],g[c]}}?
>
> I want to do {GPD, Population} for all countries.
>
> Something similar to the following...
> {CountryData[#, "GDP"]&, CountryData[#, "Population"]&} /@
>   CountryData[]
>
> It ends up in the form of {f,g}[a,b,c,d,...]. I need a way to
> 'distribute' the country name into the GDP and Population portion.
>

Instead of trying to transform an awkward result into a convenient one, 
generate the convenient one directly:

{CountryData[#, "GDP"], CountryData[#, "Population"]} & /@
  CountryData[]


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