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)*Reply-to*: <ingolf.dahl at telia.com>*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, \"RefGuideLinkText\"], Rule[ButtonFrame, None], RuleDelayed[ButtonData, \"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]]