       Re: Re: Types in Mathematica, a practical example

• To: mathgroup at smc.vnet.net
• Subject: [mg62863] Re: [mg62817] Re: Types in Mathematica, a practical example
• From: "Ingolf Dahl" <ingolf.dahl at telia.com>
• Date: Tue, 6 Dec 2005 23:11:00 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

```Please, could you explain better?
If I try to copy-and-paste your expressions into Mathematica, I cannot get
it to work. I get the following error message:

Syntax::sntxb:
Expression cannot begin with
"[[Expression:||| Array[x,{2,2}] |||]]". More...

or

Syntax::"tsntxi" : "\"\!\([\(\([\(\(Expression : \(\(|| \(\(| \(\(\"Array[x,
{2, 2}]\" ||\)\) |\)\)\)\)\)\)]\)\)]\)\" is incomplete; more input is
needed.(\"\") (ButtonBox[\"More\[Ellipsis]\", Rule[ButtonStyle,
\"General::tsntxi\"]])"

"Expression" is not very well explained in the help, and how should I
interpret the three vertical bars? The notation does not look like anything
I am used to.

Best regards

Ingolf Dahl
Sweden

-----Original Message-----
From: i-faisal at wolfram.com [mailto:i-faisal at wolfram.com]
To: mathgroup at smc.vnet.net
Subject: [mg62863] [mg62817] Re: Types in Mathematica, a practical example

I like to use Array when I want a variable to be treated as a matrix.

[[Expression:||| Array[x,{2,2}] |||]]

This is probably not what you want since the output is a nested list. This
is not the same as declaring a variable as a matrix. But now, this approach
works:

[[Expression:||| a={{1,2},{3,4}}|||]]

[[Expression:||| Array[x,{2,2}] - a /. x[k__]:>a[[k]] |||]]

Link to the forum page for this post:
http://www.mathematica-users.org/webMathematica/wiki/wiki.jsp?pageName=Speci
al:Forum_ViewTopic&pid=6675#p6675
Posted through http://www.mathematica-users.org [[postId=6675]]

```

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