Extract coefs. and exponents from a list . Package problem

• To: mathgroup at smc.vnet.net
• Subject: [mg30684] Extract coefs. and exponents from a list . Package problem
• From: guillerm at aida.usal.es (Guillermo Sanchez)
• Date: Sat, 8 Sep 2001 02:22:27 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```Dear group
(*I wish extract the coeffs and the exponents from expresion as follow*)

list1=0.1 Exp[-0.3 t]+0.2 Exp[-0.1 t]+0.4 Exp[-0.4 t];

(*This function works*)

ExtractCoef1[list_]:=
Block[{f,g,a,b},f[a__]:={a};
g[b__]:={b};{(#1/.a_*Exp[b_*t]\[Rule]a&)/@
f@@list,(#1/.a_*Exp[b_*t]\[Rule]b&)/@g@@list}]

ExtractCoef1[list1]

(*out[]:{{0.4`,0.1`,0.2`},{-0.4`,-0.3`,-0.1`}}*)(*it works*)

(*But, if I use this function inside a package it doesn`t work*)

BeginPackage["test`test`"];

ExtractCoef::usage="ExtractCoef[test]";

Begin["`Private`"];

ExtractCoef[list_]:=
Block[{f,g,a,b},f[a__]:={a};
g[b__]:={b};{(#1/.a_*Exp[b_*t]\[Rule]a&)/@
f@@list,(#1/.a_*Exp[b_*t]\[Rule]b&)/@g@@list}]
End[];
Protect[ExtractCoef];
EndPackage[];

ExtractCoef[list1](*It doesn´t work*)

(* question 1: I wist fix this problem,any help?,
question 2: Could any body build a expresion easier?*)

```

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