Re: Part Function

*To*: mathgroup at smc.vnet.net*Subject*: [mg132256] Re: Part Function*From*: Bob Hanlon <hanlonr357 at gmail.com>*Date*: Fri, 24 Jan 2014 04:20:38 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-outx@smc.vnet.net*Delivered-to*: mathgroup-newsendx@smc.vnet.net*References*: <20140123083445.902A469D4@smc.vnet.net>

Q1[k, 1] doesn't return anything useful since Q1 is not a function and [k,1] is the form of an argument to a function. For a part, you should be using Q1[[k,1]] rather than Q1[k,1]. Q1 = Array[q, {96, 96}]; With[{ k = RandomInteger[{1, 96}], n = RandomInteger[{1, 96}]}, Part[Q1[[k]], n] === Q1[[k]][[n]] === Q1[[k, n]] ] True See documentation for Part. Bob Hanlon On Thu, Jan 23, 2014 at 3:34 AM, Fred Najmy <fnajmy at gmail.com> wrote: > I have a Mathematica script containing the following line: > > v[k_] := SetAccuracy(2*(Part[Q1[[k]],1]),45] > > where Q1 is a 96 x 96 matrix. > > Is Part[Q1[[k]],1] the same as Q1[k,1]? If not, what is it returning? > > Any help appreciated. > >

**References**:**Part Function***From:*Fred Najmy <fnajmy@gmail.com>