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Re: Very simple question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg132539] Re: Very simple question
  • From: "Nasser M. Abbasi" <nma at 12000.org>
  • Date: Wed, 9 Apr 2014 04:46:49 -0400 (EDT)
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  • Reply-to: nma at 12000.org

On 4/9/2014 3:14 AM, Ste[hen Gray wrote:
> 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}}]
>

First problem: the input is "ptl". Then inside the module
you use "pt1".

One uses the lower case letter L, and the second uses the number 1.

The second problem: There is no such thing as "pt2" and "pt3"
anywhere. Where did these come from?

> fy[pt1_] := Module[{zz, x1, y1, x2, y2, x3, y3},
>     zz = pt1;

This one uses "pt1" as input and uses "pt1" inside the module.
So this one is correct.

--Nasser




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