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Re: General--Difficulties in Understanding Mathematica Syntax #2 1 52 (8/27/2006 5:51:26 AM) comp.soft-sys.math.mathematica On 8/26/06 at 2:04 AM, siegman@stanford.edu (AES) wrote: >Concepts like Map[ ], Thread[ ], Apply[ ] are thoroughly understood >by adepts, and marginally understood by some of the rest of us. >They're not ... Bill

Re: Change of Basis function 0 66 (8/26/2006 6:48:20 AM) comp.soft-sys.math.mathematica On 8/25/06 at 5:34 AM, dsboily@fastmail.ca (David Boily) wrote: >I would like to know if there is a function capable of giving as >output the representation of a vector in a given basis. For example: >Fu... Bill

Re: How to handle Arrays that has functional parameters: 0 58 (8/25/2006 9:56:35 AM) comp.soft-sys.math.mathematica On 8/23/06 at 7:15 AM, gopinathv@ou.edu (Gopinath Venkatesan) wrote: >If we have to define an array but also work as a function, how do we >define them? >For example, consider the following: > >\!\(\(f... Bill

Re: reading all the files in one directory 0 55 (8/23/2006 11:38:03 AM) comp.soft-sys.math.mathematica On 8/22/06 at 5:20 AM, s.figueiredo@biologie.hu-berlin.de (Ana Sofia Figueiredo) wrote: >Could anyone please tell me how can a read all the files in one >directory? Assuming the working directory is se... Bill

Re: Several functions in a single 2D-plot 0 40 (8/18/2006 8:07:14 AM) comp.soft-sys.math.mathematica On 8/17/06 at 4:18 AM, vginer@gmail.com (Vicent) wrote: >How can I plot several functions within the same 2D graphic? >For example, I want to draw the PDF of 3 continuous statistical >distributions (I me... Bill

Re: FileNames subdirectory count discrepancy 1 73 (8/17/2006 9:03:46 AM) comp.soft-sys.math.mathematica On 8/16/06 at 3:36 AM, chris@chiasson.name (Chris Chiasson) wrote: >from the help: FileNames[forms, dirs, n] includes files that are in >subdirectories up to n levels down. >why does a file that is only ... Bill

Re: No output or In[n] prompt appearing 0 38 (8/16/2006 8:05:38 AM) comp.soft-sys.math.mathematica On 8/14/06 at 6:44 AM, alireza.amirkhizi@gmail.com wrote: >I have this weird problem. When I enter anything as simple as >2+2 >and shift+Enter, there is no error or anything. It seems that the >cell i... Bill

Re: Question about DiracDelta 0 52 (8/14/2006 10:59:33 AM) comp.soft-sys.math.mathematica On 8/13/06 at 5:52 AM, michev@gmail.com (vasil michev) wrote: >Plot[NIntegrate[DiracDelta[3 - Cos[x] - Cos[y] - Cos[z] - e], {x, >-Pi, Pi}, {y, -Pi, Pi}, {z, -Pi, Pi}, MaxPoints -> 1000000]/8/Pi^3, >{e, 0,... Bill

Re: How do I create a parametric expression? 0 53 (8/10/2006 4:05:21 AM) comp.soft-sys.math.mathematica On 8/9/06 at 4:19 AM, axlq@spamcop.net (axlq) wrote: >I'm trying to figure out how to simplify a large expression so that >it's expressed in terms of a sub-expression that's factored into the >larger one. ... Bill

Re: Newbie question about column sums of arrays 0 41 (8/9/2006 8:43:20 AM) comp.soft-sys.math.mathematica On 8/8/06 at 6:29 AM, gwgilc@wm.edu (George W. Gilchrist) wrote: >I have spent several hours trying to find an answer to what must be >an incredibly simple problem: how to sum the columns of an array >cont... Bill

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Why polynomial Can't output as Number? 3 37 (8/25/2006 10:33:40 PM) comp.soft-sys.math.mathematica data={7,2,3,25,1,10}; f=InterpolatingPolynomial[data,x]; f/.x->5; Result as attachment picture. why can't get a simply number? thanks ... sunose (4)

position lists 12 31 (8/16/2006 8:11:42 AM) comp.soft-sys.math.mathematica have In: a = {1, 1, 2, 2, 1, 4} want {{1, 2, 5}, {3, 4}, {0}, {6}}; more effectively than just In: Position[a, #] & /@ Range[4] Out: {{{1}, {2}, {5}}, {{3}, {4}}, {}, {{6}}} Ideas? Known one-... rychphd (77)

Simple Plot3D/Function Syntax issue 7 29 (8/10/2006 4:03:18 AM) comp.soft-sys.math.mathematica When I enter f = e^-(x^2 + y^2) (x^2 + 2y^2) It gives me a syntax::noinfo error but the output looks like the correct textbook style function. Also, when I try to plot it Plot3D[e^-(x^2 + y^2) (x^2 + 2y^... jtolman (11)

MemberQ 9 39 (8/8/2006 10:39:25 AM) comp.soft-sys.math.mathematica Re Mathematica 5.2.0.0. Since 0.7 is in the set {0.0, 0.1, 0.2,..., 0.9, 1.0}, why does MemberQ[Range[0., 1., .1], .7] return False? Thankx. Bruce ... vze269bv (89)

How to get the output of Minimize function in x = a format 6 45 (8/8/2006 10:38:24 AM) comp.soft-sys.math.mathematica Say that,I have the following minimization problem Minimize[x^2 - 3x + 6, x] which gives me the x value that minimizes the expression in the format of {x -> 3\2}. I want to get the result in the ... erkuts (1)

Using Map with function that has options... 7 33 (8/7/2006 5:45:47 AM) comp.soft-sys.math.mathematica I have several expressions I whant to convert to string and then concatenate togheter to create a message to be sent to the standard output and written on a text log file. To avoid manually appliyng ToString... giacomo.ciani (12)

NonLinearRegress Problem 4 36 (8/2/2006 9:27:17 AM) comp.soft-sys.math.mathematica I have the following problem with NonLinearRegress I have defined the following function deb[teta_,n_,t]:= 9 n (t/teta)^3 Nintegrate[(x^4 Exp[x])/(1+Exp[x])^2,{x,0,t/teta}] I can Table this function w... jour (2)

Block v. Module 4 38 (7/27/2006 9:47:40 AM) comp.soft-sys.math.mathematica Re Mathematica 5.2.0.0. The Module and Block below "should" return the same result, but they don't. The Module's result makes no sense, while the Block's result is what I want. What's Module doing? The ... vze269bv (89)

Graphics export quality-methods and defaults 8 40 (7/26/2006 6:39:51 AM) comp.soft-sys.math.mathematica Hi, I'm trying to understand how Mathematica generates graphics within notebooks and how they are exported. I'm running Mathematica 5.2 on OS 10.4.6. I've generated a listplot lplot = ListPlot[....] ... kevinbowman (17)

MapThread and If 8 42 (7/20/2006 10:11:04 AM) comp.soft-sys.math.mathematica Hi, Of course MapThread[If[#1 == #2, 0, tr] &, {{1, 2, 3}, {2, 2, 4}}] I get {tr, 0, tr} and for MapThread[If[#1 == #2, 0, tr] &, {{1, 2, 3}, {2, 2, {3, 4}}}] I get {tr, 0, If[3 == {3, 4... Arkadiusz.Majka (14)