
                                                    < M A T L A B >
                                        Copyright 1984-2005 The MathWorks, Inc.
                                        Version 7.1.0.183 (R14) Service Pack 3
                                                    August 02, 2005


  To get started, select MATLAB Help or Demos from the Help menu.

>> format long
>> x=fzero(@(x) x*exp(x)-1,1)

x =

   0.56714329040978
>> x*exp(x)-1

ans =

     2.220446049250313e-16
>> eps

ans =

     2.220446049250313e-16

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Meglio di cosi' non si puo' fare, visto che un programma di computer algebra come Maple fornisce 


    |\^/|     Maple 9 (IBM INTEL LINUX)
._|\|   |/|_. Copyright (c) Maplesoft, a division of Waterloo Maple Inc. 2003
 \  MAPLE  /  All rights reserved. Maple is a trademark of
 <____ ____>  Waterloo Maple Inc.
      |       Type ? for help.
> evalf(LambertW(1),100);
0.5671432904097838729999686622103555497538157871865125081351310792230457930\
    866845666932194469617522946

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