Re: MatrixForm affects values instead of only printing ?????
- To: mathgroup at smc.vnet.net
- Subject: [mg100358] Re: MatrixForm affects values instead of only printing ?????
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Mon, 1 Jun 2009 07:13:14 -0400 (EDT)
- References: <gvtmh7$ggc$1@smc.vnet.net>
Hi,
your test2 is
MatrixForm[{-3,7,5}]
and MatrixForm[] must change the expression because
it wrap arround the expression.
Just read the manual :-)
Regards
Jens
summer wrote:
> Here is the example:
>
> test1={-3, 7, 5}
> test1[[3]]
>
> returns the list and 5 as expected;
>
> test2={-3, 7, 5}//MatrixForm
> test2[[3]]
>
> returns a column vector and error: "part 3 of blah blah doesn't exist". The actual list itself is test2[[1]]. To get the right 3rd element I have to do:
>
> test2[[1,3]]
>
> which returns 5 as expected.
>
>
> The problem is MatrixForm is NOT supposed to change the expression it is applied on according to the manual. Is that a bug or there's logical explanation?
>