0
votes
2answers
80 views

Higher order eigenvalue problem [on hold]

Does anybody know some ideas, references or something like these to solve such third order eigenvalue problem using Mathematica: $\Psi'''(x) + (1 - 4x^2) \Psi'(x) - 6x\Psi(x) = E \Psi(x)$
4
votes
1answer
50 views

Tools for Importing/working with SEED seismographic data in Mathematica?

Do you know if exist a library or a package in order to import and work with SEED Seismographic data in Mathematica?
5
votes
3answers
140 views

Prevent iterator name from being confused with symbol passed into function body

I have a massive amount of code with lots of Table and Sum inside a Module. Each with their ...
4
votes
1answer
66 views

Mathematica 10 crashes when kernel is quit from MenuItem

I'm actively developing a large codebase that I load every time I use Mathematica. I frequently quit my kernel and reload the codebase to incorporate new changes. I've created a custom menu by editing ...
1
vote
1answer
88 views

Under what conditions does Mathematica give a natural antiderivative when integrating?

Natural antiderivative is defined as follows, using Fourier transform: $$f^{(-1)}(x)=\frac{i}{2\pi}\int_{-\infty}^{+\infty} \frac{e^{- i \omega x}}{\omega} \int_{-\infty}^{+\infty}f(t)e^{i\omega t}dt ...
10
votes
4answers
244 views

What is the correct way to use specific rule for specific pattern match when parsing an expression?

update: Thanks for the answers below. But I noticed they do not handle the following special cases: lis=1 and lis=z , ...
0
votes
0answers
55 views

How to find roots of a general 4th order polynomial equation [on hold]

I have a fourth degree equation with 3<b<4 (if that helps): ...
2
votes
0answers
49 views

Error when using EquationTrekker

I just got to know EquationTrakker because I need to do phase graphs for my classes. When I load it ...
0
votes
0answers
33 views

Replacement with list element works, but yields error [closed]

random = {42}; c[1] /. c[i_] -> random[[i]] The above yields 42 as expected, but also gives this error: ...
8
votes
2answers
167 views

Keep Mathematica from simplifying functions with a specified Head

I want to run Simplify and/or Refine on various expressions, but keep it from touching anything that contains a specific ...
4
votes
1answer
81 views

Optimizing a function containing a complex exponential

I've noticed the following significant different in performance for different formulations of the same function: ...
6
votes
3answers
135 views

Isolating string characters

I have the following string: ...
7
votes
0answers
116 views

Can code optimize code?

Are there functions, programs or packages that deal with optimizing mathematica code i.e. re-writing ineffecive or convoluted code. -This question has haunted me since I joined SE. The background for ...
0
votes
1answer
39 views

Ivar error with Fit inside Plot

I'm trying to plot this Plot[Fit[med,{1,x},x],{x,0,10}] Why this doesn't work? I find out that if I do ...
0
votes
0answers
53 views

What methods does Solve use?

Could you tell me which method that Solve applies to solve linear and polynomials equations?
5
votes
1answer
94 views
7
votes
1answer
163 views

How can I only draw outer common tangent to two circles?

I have code worked for drawing common tangent lines to two circles(http://en.wikipedia.org/wiki/Tangent_lines_to_circles), now I want to delete the inner common tangent lines, how? ...
7
votes
1answer
129 views

How to find the positive region of this function?

I'm new-ish to Mathematica and I'm using it to learn the basics of derivative trading (for fun not for trading!). I've defined a simple function to calculate the pay off of a trading on a call. I have ...
0
votes
0answers
22 views

What is the common term of this series? [closed]

Consider the following series of numbers . 3,5,17,257,65537 What is the common term of this series? (n is a positive integer)
4
votes
3answers
124 views

Plot failing over set domain with any functions

I'm here with a rather interesting problem which I have no clue how to fix. I am trying to plot a function: Plot[x && 0 <= x <= (1/8), {x,-9,9}] ...
2
votes
2answers
61 views

ToExpression from commandline [duplicate]

I like to use Mathematica 8.0 from the commandline, then I just have to SSH in, no matter where I am, and go. I also like to do this without forwarding X, because that is slow and lags on my ...
4
votes
2answers
98 views

Is there a built-in function to map a list of heads to a list of data?

Assume that this built-in function is called func. What I want is func[{f,g},{a,b,c}] will return the following result: ...
0
votes
0answers
23 views

Sinchronicity and probability [closed]

"Synchronicity is the experience of two or more events as meaningfully related, where they are unlikely to be causally related. The subject sees it as a meaningful coincidence." Wikipedia First, I am ...
1
vote
0answers
131 views

What are the best tips in Michael Trott's beer/whiskey Wolfram Blog post? [closed]

Michael Trott posted this incredible tour-de-force on the wolfram blog: http://blog.wolfram.com/2014/08/19/which-is-closer-local-beer-or-local-whiskey/ The length of the post is overwhelming, so I'm ...
5
votes
1answer
97 views

How to graph the revolution of solid limited by 2 points in x axis [duplicate]

I'm learning how use this program. And I have problem with how graph the solid of revolution.Here i write one exercise. y=2-1/2x, y=0,x=1,x=2; about the x-axis. This is the graph also the volume ...
3
votes
2answers
76 views

Problem with machine number precision in compiled functions

When I compile a very big function and give it input the function returns error. I realized that this is because the value of the function becomes smaller than the smallest machine number. Is it ...
3
votes
1answer
48 views

Part specification error only in LogPlot

I've a problem. I defined a simple list and a function like below: lst := {5, 10, 20} f[m_] := lst[[Floor[m/10]]]; and drew a plot ...
0
votes
0answers
75 views

Formula for a 15 - Puzzle game (Backwards and forward solution) [closed]

So I currently code a 15-Puzzle Game. Every tile has position starting between 1 and 16. For example has a tile which is at the position where number 3 should be the position 3. Now I need to find ...
2
votes
3answers
88 views

Dependency injection - use a specific implementation of one function within another

Consider... f[x_]:=Body containing h[some args]... g[x_]:=Body containing h[some args]... However I want to define something like... ...
4
votes
2answers
105 views

Find file names in directory

I am trying to find the list of any file in any directory of a given name (by in the directory, I mean directly in the directory, so in a directory which is in the directory would not count). For the ...
0
votes
1answer
68 views

What is this type of chart called? [closed]

What is this type of chart called. I have heard pictorial mentioned but are there other names? Is it defined anywhere? Simply shows proportion and type. Thanks.
8
votes
5answers
313 views

How to generate random points in a region?

The Mathematica 10 documentation was updated for FindInstance adding support for regions. In my use case I'm trying to sample points in a set of disks: ...
1
vote
1answer
87 views

Bad fonts in Mathematica 10

In Mathematica V10, the glyphs for mathematical and/or other special symbols are wrong. I see this in input cells and also in the Basic Math Assistant palette. How do I solve this problem?
3
votes
3answers
108 views

Help with coding triangular nodes/elements

I'm trying to write a program where it will shoot out the triangle node numbers. For example, in the picture, if we choose to divide this triangle by 5 points, then the program will return out the ...
1
vote
1answer
53 views

Importing multiple images for machine learning classification

I want to create a ML classifier using images just like this example. I have two classes of images in two different folders. Is there an easier way to import all images from both folders rather than ...
2
votes
0answers
52 views

How to solve for exponents in an infinite product?

Say I have a power series, $f(x,y) \in 1 + x\mathbb{Z}[[x,y]]$ Then it admits a unique expansion $$f(x,y) = \prod_{i=1}^\infty \prod_{j=0}^\infty (1 - x^i y^j)^{n_{i,j}}$$ for some integers, $i, ...
5
votes
2answers
90 views

Return value of Reap when using tags

I've noticed a behaviour of Reap that I don't quite understand yet. Suppose I want to Sow several values during a computation. ...
1
vote
1answer
87 views

Horizontally compress a picture with varying compression ratio [on hold]

I have a function c[x] whose domain and range are both [0,1]. And I have a picture with width W, height ...
7
votes
0answers
79 views
+50

How to export .mtl files for 3D textured objects

I would really like to deploy my textured 3D graphics in the web with sketchfab in my blog. Unfortunately, Mathematica only exports the shape of the 3d graphics, i.e. the .obj file, but omits the ...
2
votes
0answers
38 views

Two problems with NDSolve when using Method -> Projection

I tried to solve a system first order differential equations together with a constraint equation. I use the Method -> Projection to check if the constraint holds ...
1
vote
0answers
74 views

Window ▶ Show Handwriting Input

How might I force Mathematica to display the Handwriting Input menu? Currently I'm on W7 using a Wacom Tablet and unable to find the Handwriting Input option. It doesn't display under Windows>.
6
votes
3answers
213 views

How to count the integer grid numbers defined by inequalities?

I have the following code to show a red area defined by inequalities: ...
4
votes
3answers
252 views

DSolve not finding solution I expected

Try to solve the following ODE via DSolve $$ \left\{\begin{aligned} y'(x)+2 y(x) e^x-y(x)^2 &= e^{2 x}+e^x \\ y'(0) &=1 \end{aligned}\right. $$ The ...
0
votes
0answers
41 views

Lightweight Grid preferences screen stopped working after v10 install

I am getting the following error when I try to open the Lightweight Grid "Preferences" tab... ...
3
votes
1answer
96 views

May I restrict caching to disk when memory runs low? [duplicate]

An hour ago, I had to hard reset my laptop again because Mathematica froze the system again. When import a large file or make a mistake that produces huge arrays with complicated entries etc., I often ...
15
votes
4answers
291 views

Make MapIndexed listable

My goal is to apply MapIndexed to every element of a nested list without destroying the arithmetic operations within the elements. For example, let's start with ...
1
vote
2answers
54 views

How to use the output we see of expression when this expression is inside Dynamic

Consider this example: Manipulate[status = Dynamic[If[a < b, Yes, No]], {a, 2}, {b, 5}] The output of this calculation is ...
1
vote
2answers
620 views

Computing 10-dimensional volume of a 9-sphere [closed]

I'm trying to compute 10-dimensional volume of a 9-sphere with radius r using Monte Carlo. ...
7
votes
1answer
72 views

On using DiracDelta[t] in OutputResposne in version 10. Different result from version 9

I am baffled by this. I was trying to run same example I had working in version 9.01 and found now I get empty plots. The example is here . Here is a simplified version of the above. The same exact ...
1
vote
1answer
37 views

Connect to Windows kernel from Linux computer

I've seen many questions regarding the connection to a Linux machine from a Windows one, but I need to do the opposite. Situation: I have Mathematica on my Linux laptop (...

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