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Re: Tag List Protected error

  • To: mathgroup at smc.vnet.net
  • Subject: [mg113740] Re: Tag List Protected error
  • From: Raffy <adraffy at gmail.com>
  • Date: Wed, 10 Nov 2010 06:27:39 -0500 (EST)
  • References: <ib5u05$c0j$1@smc.vnet.net> <ib8csq$2fn$1@smc.vnet.net> <ibb27h$56a$1@smc.vnet.net>

On Nov 9, 12:54 am, niobe <ben.carb... at gmail.com> wrote:
> Apologies, that was just a typo when copying to email and my function
> arguments are correct
>
> update[x_, y_] := ReplacePart[
>  x,
>  {y[[1, 1]], y[[2, 1]]} -> x[[y[[1, 1]], y[[2, 1]]]] - y[[2, 2]]
> ]
> .. SetDelayed::write: Tag List in <snip> is Protected.
>
> Has no-one else encountered this issue?

Could you provide a x, y pair that reproduce this error?

I would avoid using ReplacePart.  If I understand your example
correctly...

y is a ragged array: {{row}, {col0, col1}}

And you're performing the following operation: x[[row, col0]] - x[[row, col1]]

update2[x_, {{row_}, {col0_, col1_}}] := Module[{temp = x},
   temp[[row, col0]] -= temp[[row, col1]];
   temp
];


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