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Re: Returning a local array

  • To: mathgroup at smc.vnet.net
  • Subject: [mg84200] Re: Returning a local array
  • From: dh <dh at metrohm.ch>
  • Date: Thu, 13 Dec 2007 06:00:25 -0500 (EST)
  • References: <fjqj9l$6l9$1@smc.vnet.net>


Hi Art,

you could e.g. define index/value pairs by h. Subsequently you could set 

the values of g like:

h={{"a",1},{"b",2}};

(g [#[[1]]]=#[[2]])& /@ h;

this will set g["a"] to 1 e.t.c.

hope this helps, Daniel



Art wrote:

> I would like to return a local array. The below seems like the wrong

> way to do it:

> 

> f[] := Module[{h}, h["a"] = 1; h["b"] = 2; h];

> g = f[];

> 

> I would like g not to be associated with the local variable h, but

> equivalent to defining it as follows:

> 

> g["a"] = 1; g["b"] = 2;

> 

> Is it better to work with rules instead? It can become awkward and I

> would like to avoid it.

> 

> f[] := Module[{h}, h={"a" -> 1, "b" -> 2}; h];

> g = f[];

> "a" /. g

> 

> The specific problem is I am reading the header for a binary file that

> has 20 or so parameters describing the binary file. I thought this

> would be the analog of a structure in other languages and a good way

> to put these parameters in a variable.

> 

> Thanks.

> 




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