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Very simple question

• To: mathgroup at smc.vnet.net
• Subject: [mg132535] Very simple question
• From: "Ste[hen Gray" <stevebg at roadrunner.com>
• Date: Wed, 9 Apr 2014 04:14:26 -0400 (EDT)
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I've been away from Mathematica for about 7 years.
Can anyone tell me why function fx gives an error message but fy does 
not? They look functionally the same to me.
Please send me an email about this.

fx[ptl_] := Module[{x1, y1, x2, y2, x3, y3},
   Print[pt1];
   x1 = pt1[[1, 1]]; y1 = pt1[[1, 2]];
   x2 = pt2[[2, 1]]; y2 = pt2[[2, 2]];
   x3 = pt3[[3, 1]]; y3 = pt3[[3, 2]];
   Print[x1, y1, x2, y2, x3, y3];
   ]
fx[{{1, 2}, {3, 5}, {4, 7}}]

fy[pt1_] := Module[{zz, x1, y1, x2, y2, x3, y3},
   zz = pt1;
   Print[zz];
   x1 = zz[[1, 1]]; y1 = zz[[1, 2]];
   x2 = zz[[2, 1]]; y2 = zz[[2, 2]];
   x3 = zz[[3, 1]]; y3 = zz[[3, 2]];
   Print[x1, y1, x2, y2, x3, y3]
   ]
fy[{{1, 2}, {3, 5}, {4, 7}}]

Thank you.
Steve Gray
stevebg at roadrunner.com

• Follow-Ups:
  • Re: Very simple question
    • From: "Dave Snead" <dsnead6@charter.net>
  • Re: Very simple question
    • From: Bob Hanlon <hanlonr357@gmail.com>
  • Re: Very simple question
    • From: W Craig Carter <ccarter@MIT.EDU>