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MathGroup Archive 2008

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Set::setraw error

  • To: mathgroup at smc.vnet.net
  • Subject: [mg90326] Set::setraw error
  • From: Steven Siew <stevensiew2 at gmail.com>
  • Date: Sun, 6 Jul 2008 07:17:46 -0400 (EDT)

I have encountered this Set:setraw error for the code below.

I'm stumped. Does anyone have any idea what went wrong?

xgcd[a_,b_]:=Module[{xsign=1,ysign=1,x=1,y=0,r=0,s=1,c,q},
    If[a == 0 && b == 0,Return[{0,0,1}]];
    If[a == 0,Return[{Abs[b],0,b/Abs[b]}] ];
    If[b == 0,Return[{Abs[a],a/Abs[a],0}]];
    If[a<0,a=-a; xsign=-1];
    If[b<0,b=-b; ysign=-1];
    While[b\[NotEqual]0,
      {c,q}={Mod[a,b],Quotient[a,b]};
      {a,b,r,s,x,y}={b,c,x-q*r,y-q*s,r,s}
      ];
    Return[{a,x*xsign,y*ysign}]
    ]

xgcd[2, 3]

\!\(\*
  RowBox[{\(Set::"setraw"\), \(\(:\)\(\ \)\), "\<\"Cannot assign to
raw \
object \\!\\(2\\). \\!\\(\\*ButtonBox[\\\"More\[Ellipsis]\\\", \
ButtonStyle->\\\"RefGuideLinkText\\\", ButtonFrame->None, \
ButtonData:>\\\"Set::setraw\\\"]\\)\"\>"}]\)


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