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.

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