hanlonr357's articles:

Items(23) /3 Next >> Last >|

Re: NDSolve with NIntegrate where Integral is a function of x 0 23 (7/20/2012 7:59:14 AM) comp.soft-sys.math.mathematica You did not specify g[x,t] so I could not verify that this will work. You also need to pay closer attention to syntax. h[x_?NumericQ] := Integrate[g[x, t], {t, 0, Infinity}] NDSolve[{y'[x] == f[x]*h[x]... Bob

Re: what would cause a symbol not to clear using Clear[name] or Remove[name]? 0 23 (7/9/2012 2:47:29 AM) comp.soft-sys.math.mathematica Here is an example of one way that can occur. y starts off clear ??y Global`y $Post is set to define y after any evaluation ($Post=(y=10;#)&); Now, even clearing y will set it Clear[y] ?... Bob

Re: Modifying an entry in array specified by a list of arbitrary length #3 0 30 (7/5/2012 10:17:56 AM) comp.soft-sys.math.mathematica x = Array[a, {4, 3, 5}]; i = {1, 2, 3}; Element to be modified x[[Sequence @@ i]] a[1, 2, 3] Change element x[[Sequence @@ i]] += 1 1 + a[1, 2, 3] Verifying that array was modified x[... Bob

Re: how to export to Excel in Mathematica from a Parametricplot command 0 35 (7/4/2012 7:30:30 AM) comp.soft-sys.math.mathematica sol = NDSolve[{ y'[t] == y[t] (x[t] - 1), x'[t] == x[t] (2 - y[t]), x[0] == 1, y[0] == 2.7}, {x, y}, {t, 0, 10}]; plt = ParametricPlot[{x[t], y[t]} /. sol, {t, 0, 10}] points = Cases[pl... Bob

Re: how to make a list of rules with 2 other lists composed by different kinds of elements #2 0 16 (7/2/2012 9:24:13 AM) comp.soft-sys.math.mathematica Use Thread list1 = {1, 2, 3}; list2 = {"file1", "file2", "file3"}; list3 = Thread[list1 -> list2] {1 -> "file1", 2 -> "file2", 3 -> "file3"} Head /@ list3 {Rule, Rule, Rule} Head /@ list3[[... Bob

Re: An easier functional way to divide each Column of matrix by a row vector, element-wise? #2 0 28 (6/29/2012 8:52:39 AM) comp.soft-sys.math.mathematica #/v & /@ mat Bob Hanlon On Thu, Jun 28, 2012 at 4:02 AM, Nasser M. Abbasi wrote: > hello; > > I found a better solution. > > (after a strong coffee and staring on it for sometime) > > method(5... Bob

Re: Any efficient way to make complete homogeneous symmetric functions in Mathematica? 0 26 (6/11/2012 4:02:30 AM) comp.soft-sys.math.mathematica homogeneousSymmetricPolynomial[k_Integer, var_List] := Module[{n = Length[var], t}, SeriesCoefficient[Times @@ (1/(1 - var*t)), {t, 0, k}]] /; 0 wrote: > We do have elementary symmetric function... Bob

Re: InverseZTransform numerical issue on some expression, version 8.0.4 0 21 (6/8/2012 7:39:25 AM) comp.soft-sys.math.mathematica $Version 8.0 for Mac OS X x86 (64-bit) (October 5, 2011) On my Mac, I had to truncate even more to get a result sol1=InverseZTransform[ 1/(0.95122942-1.95122942 z+z^2),z,n]// Simplify \[Piecewise]... Bob

Re: from a 2d-figure to an interactive 3d model? is it possible with mathematica? #4 0 29 (4/28/2012 9:32:17 AM) comp.soft-sys.math.mathematica Start simple and add one thing at a time evaluating the results at each step. Refer to the online documentation often until you are much more experienced--I still use the documentation often. Bob Hanlon ... Bob

Re: from a 2d-figure to an interactive 3d model? is it possible with mathematica? #2 2 28 (4/26/2012 9:33:50 AM) comp.soft-sys.math.mathematica Use Manipulate. Here is a partial example : Manipulate[ Module[ {tan, ll, lr, ur, r, pt, t}, tan = Tan[30 Degree]; ll = {-w/2, -d/2}; lr = {w/2, -d/2}; ur = {w/2, d/2}; r = Sqrt[(20 + d/2... Bob

hanlonr357's replies:

Items(14) /2 Next >> Last >|

Relational operators on intervals: bug? 14 15 (11/11/2012 8:59:15 PM) comp.soft-sys.math.mathematica Hi there, I would like to know if someone understands the behavior of relational operators on intervals reported below. I, personally, consider items 1 and 2 below bugs, and 3, a conceptual flaw. 1. Compari... bertiiiiiiiiiiiiiiiiiiiiiiiiii (2)

Help with "recession bar" graph 7 27 (1/30/2004 9:37:20 AM) comp.soft-sys.math.mathematica Hi, I was wondering if someone might assist me in the construction of a "recession bar" graph. This type of graph is often used in economics to depict interesting sub-periods on a time series graph. .Fo... mark387 (35)

Terrible unit trouble in Mathematic 9 7 19 (12/18/2012 7:35:32 AM) comp.soft-sys.math.mathematica I continue to receive "Unable to interpret unit specification m/s" (for example, but almost anything I attempt returns this message) with input: UnitConvert[55 mi/h,"m/s"] or UnitConvert[55 mi/h,m/s] or any ot... tio540s1 (4)

Integrate bug in v 9.0.0 3 8 (2/2/2013 6:15:44 AM) comp.soft-sys.math.mathematica In version 9.0.0 the following integral is reported as divergent: In[71]:= Integrate[x^2/(x^2 - x0^2), {x, x1, x2}, Assumptions -> x0 > x2 > x1 >= 0] During evaluation of In[71]:= Integrate::idiv: Integ... lehin.p (226)

A question about numerically solving differential equations 7 6 (3/26/2013 8:05:23 AM) comp.soft-sys.math.mathematica Hi, I am using Mathematica to numercially solve the following equations: 2 D[f0[r], r]/r + D[f0[r], r, r] == -2 A f1[r]/r^4 + 2 A D[f1[r], r]/r^3 -2 f1[r]/r^2 + 2 D[f1[r], r]/r + D[f1[r], r, r] == 2 A D... zhaoyue.hep (1)

Setting parameters via Manipulate? 5 42 (10/6/2011 8:27:47 AM) comp.soft-sys.math.mathematica Dear Community, I am facing a rather hard to learn problem in Mathematica: setting multiple parameters simultaneously. The basic problem is as follows: I have a set of parameters that define a physical ... lt648 (8)

Euclidean distance of all pairwise combinations (redundants) 6 30 (11/14/2012 6:33:41 AM) comp.soft-sys.math.mathematica I have been having a tough time trying to figure out how to include all red undant pairwise combinations in my results for the euclidean distance between a set of points. I have a set of points with xy coordina... jessepisel (3)

Re: Mathematica and Lisp #5 13 8 (3/2/2013 8:44:12 AM) comp.soft-sys.math.mathematica On 2/27/13 at 11:43 PM, fateman@cs.berkeley.edu (Richard Fateman) wrote: >On 2/27/2013 12:04 AM, Bill Rowe wrote: >>Easier to learn? >I'm not even arguing that. I'm saying that EF as it exists is har... readnews134 (1192)

Manually tell Mathematica how to evaluate integrals 5 16 (11/25/2012 10:07:55 AM) comp.soft-sys.math.mathematica Hi all, I have a question about Mathematica's abilities to solve integrals. There seem to be cases where an antiderivative is explicitly known yet Mathematica fails to compute the integral. One example of th... e.schlemm1 (9)

sum of coins article in mathematica journal 3 18 (10/13/2012 5:06:20 AM) comp.soft-sys.math.mathematica a long time ago I read a short text in mathematica journal. A neat little program that calculated the numer of coins needed to reach a certain sum. you put in the coin values e.g. 25 cent 50 cent etc and got t... peweijnitz (1)