Hello every one, Here is a simple question. Say I define a function In[14]:= f[x_] := a*x^2 + b*x + c Then I use Module to frame the solution of f[x] ==0 In[15]:= soln[a_, b_, c_] := Module[{}, xsoln = Solve[f[x] == 0 , x]; x /. xsoln] When I enter numerical values for parameters a, b, and c in the module, f[x] never sees these numerical values, and returns a symbolic solution. In[11]:= soln[1, -3, 2] Out[11]= {(-b - Sqrt[b^2 - 4 a c])/(2 a), (-b + Sqrt[b^2 - 4 a c])/(2 a)} But I want the module to return a numerical solution as: {{x -> 1}, {x -> 2}} My question is: without bringing f[x] explicitly into the Module function, and without redefining f as f[a_,b_,c_][x] := a*x^2+b*x+c, how can I get the module to return a numerical solution? Thanks - Rob Chai

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5/9/2014 6:07:46 AM

I would put f inside the module as well. Here is my version: Clear[soln, a, b, c] soln[a_, b_, c_] := Module[{xsoln, f, x}, f[x_] = a*x^2 + b*x + c; xsoln = Solve[f[x] == 0, x]; x /. xsoln ] Try it out: soln[1,2,3] output: {-1-I Sqrt[2],-1+I Sqrt[2]} On 5/9/2014 2:07 AM, Rob Y. H. Chai wrote: > Hello every one, > > > > Here is a simple question. Say I define a function > > > > In[14]:= f[x_] := a*x^2 + b*x + c > > > > Then I use Module to frame the solution of f[x] ==0 > > > > In[15]:= soln[a_, b_, c_] := Module[{}, xsoln = Solve[f[x] == 0 , x]; x /. > xsoln] > > > > When I enter numerical values for parameters a, b, and c in the module, f[x] > never sees these numerical values, and returns a symbolic solution. > > > > In[11]:= soln[1, -3, 2] > > > > Out[11]= {(-b - Sqrt[b^2 - 4 a c])/(2 a), (-b + Sqrt[b^2 - 4 a c])/(2 a)} > > > > But I want the module to return a numerical solution as: > > {{x -> 1}, {x -> 2}} > > > > My question is: without bringing f[x] explicitly into the Module function, > and without redefining f as f[a_,b_,c_][x] := a*x^2+b*x+c, how can I get the > module to return a numerical solution? > > > > Thanks - Rob Chai > >

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5/12/2014 4:44:02 AM

Is it just me or do most Perl modules (Cpan) exist outside of perl standard distribution? The phrase "try this module" casually uttered here. Am I mistaken, so many beta this and beta that listings. If I put out a module on CPAN is it a guarantee of fittness for any user of it? There is so much crap and garbage out there on CPAN it makes my head spin (Telnet being one). I've given up on anything but in the official distribution. Can anyone tell me why I've done that, or am I just imagining things? robic0 <> wrote: > Is it just me or do most Perl modules (Cpan) ex...

Dear Group members, I ran into a case where Mathematica Solve yields different solutions depending on whether I solve it analytically (and then plug in some numbers) or numerically. I'm solving an algebraic equation, with some square roots. Mathematica does NOT complain about branch cut or anything else when solving the problem analytically. Based on physical reasoning that created the equation in the 1st place the purely numerical solution is the correct one. I attached a 3-line pdf version of the notebook that demonstrates this issue. Thank you for any suggestions! https://docs.goo...

Hello, Can someone help me with an issue about digits and vpa command? The limit of digits in matlab is only 50? For example, I've done the following test: >> digits Digits = 100 >> vpa((1+sqrt(5))/2,100) ans = 1.618033988749894902525738871190696954727172851562500000000000000000000000000000000000000000000000000 (note the 0's) Now, using Mathematica i've able to get it: In[1]:= N[(1+Sqrt[5])/2,100] Out[1]= 1.618033988749894848204586834365638117720309179805762862135448622705260462818902449707207204189391137 Question 1) : How can I get the same answer in Matlab a...

Hello, I've created an archive import class (with the help of importers.py from the python /demo/imputil dir) which imports packages and modules from a dictionary. So far so good. The problem is that every import statement after the code: imputil.ImportManager().install() sys.path.insert(0, DictImporter(archive)) sys.path.insert(0, imputil.BuiltinImporter()) tries to import from the dictionary and doesn't use the modules that were imported before. For example, I would like to use os in a module that's stored in the dictionary. The import os statement tries to import os from ...

Python 2.4.2 (#67, Sep 28 2005, 12:41:11) [MSC v.1310 32 bit (Intel)] on win32 Type "copyright", "credits" or "license()" for more information. **************************************************************** Personal firewall software may warn about the connection IDLE makes to its subprocess using this computer's internal loopback interface. This connection is not visible on any external interface and no data is sent to or received from the Internet. **************************************************************** IDLE 1.1.2 >&g...

I have been trying to run a python program and I get the following error: Traceback (most recent call last): File "<string>", line 39, in ? File "/home/Larry/.blender/scripts/bzflag/__init__.py", line 22, in ? import BZfileRead File "/home/Larry/.blender/scripts/bzflag/BZfileRead.py", line 24, in ? import BZsceneWriter File "/home/Larry/.blender/scripts/bzflag/BZsceneWriter.py", line 25, in ? import BZcommon File "/home/Larry/.blender/scripts/bzflag/BZcommon.py", line 24, in ? import math ImportError: No module ...

Hello, What's the problem with this code? I get the following error message: File "test.py", line 26, in test print tbl[wi][bi] IndexError: index must be either an int or a sequence ---code snippet---- from Numeric import * tbl = zeros((32, 16)) def test(): val = testme() wi = crc >> 4 bi = crc & 0xFL print wi print bi print tbl[wi][bi] def testme(): val = 0xFFFFFFL val >>= 23 return val if __name__ == '__main__': test() Thanks, -SB In function test(), Read wi and bi as: wi = val >> 4 b...

Does somebody know why I get different behaviour for the following commands in a commandline session of mathematica 7 or inside a notebook? It also seems to be different in different Mathematica versions for the notebook format. See http://www.risc.jku.at/people/hemmecke/mathematica/ for the notebook files for Mathematica 5.2, 6.0, 7.0. Can someone explain the General::dupsym: The symbol Array with context A` already exists. message? Why does that message appear at all? If A`Array exists, then Mathematica should just use it, shouldn't it? According to http://reference.wol...

(Xp-Xt)^2+(Yp-Yt)^2+(Zp-Zt)^2=Rt^2 (Xp-Xr)^2+(Yp-Yr)^2+(Zp-Zr)^2=Rr^2 psi*(Xp-Xt)+n?*(Yp-Yt)^2+eta*(Zp-Zt)=0 Die 3 Unbekannten sind Xp,Yp,Zp Alle anderen Parameter sind bekannt. Hat jemand eine Idee wie ich diese Gleichung mit Matlab l?sen kann. Vielen Dank "m? " <maximilian.mueth@eads.com> wrote in message <g4abrc$9pt$1@fred.mathworks.com>... > (Xp-Xt)^2+(Yp-Yt)^2+(Zp-Zt)^2=Rt^2 > (Xp-Xr)^2+(Yp-Yr)^2+(Zp-Zr)^2=Rr^2 > psi*(Xp-Xt)+n?*(Yp-Yt)^2+eta*(Zp-Zt)=0 > > Die 3 Unbekannten sind > > Xp,Yp,Zp > > Alle anderen Parameter sind bekannt. ...

I am considering looking into Perl. I like C because it's for OS design and such. But what kind of math capabilities does perl have ? Especially with modules? I want to expand and factor various identities and equations. Quadratic and otherwise. Linear algebra interests me too. Bill On Sat, 17 May 2014 23:10:48 -0400, Bill Cunningham wrote: > I am considering looking into Perl. I like C because it's for OS design > and such. But what kind of math capabilities does perl have ? Especially > with modules? I want to expand and factor various identities and ...

hello; I am asking for the difference between > Digits:=200; > > eq:=-x^3+6*x^2-6*x-1: > fsolve(eq=0,x)[1]; > > solve(eq=0,x)[1]; > evalf(%); The result of evalf(%) above contains a complex part. No matter how large I make Digits to be. the result of fsolve contains only real part. The question is, would you consider this equation to have complex or real roots? thanks, Nasser In article <rXV3f.2604$tV6.1659@newssvr27.news.prodigy.net>, Nasser Abbasi <nma@12000.org> wrote: |>I am asking for the difference between ...

Dear friends, Mathematica 6 gives the analytical right answer evaluating InverseLaplaceTransform[E^((1 - Sqrt[1 + 4*d*(s + d*r)])/(2*d)), s, t], However Mathematica 7.0.0 does not the analytical solution. Is it a bug? Guillermo Hi, a result with System`LaplaceTransformDump`iPowerExpand[] in it is a bug. Regards Jens Guillermo Sanchez wrote: > Dear friends, > Mathematica 6 gives the analytical right answer evaluating > InverseLaplaceTransform[E^((1 - Sqrt[1 + 4*d*(s + d*r)])/(2*d)), s, > t], > However Mathematica 7.0.0 does not the analytical sol...

----- Original Message ----- > From: "Bill Rowe" <readnews@sbcglobal.net> > [...] > >So to my opinion Mathematica does the following: 1) first convert > >all numbers to numbers of the lowest precision found in the > >expression, 2) follow the usual evaluation chain. Am I correct? > > I don't know if this is entirely true. In my experience, > Mathematica converts numbers in any expression containing both > machine precision numbers and higher precision numbers to > machine precision before completing the evaluation. But I...

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