# All Questions

89 views

### Significant platform-dependent efficiency when importing data?

I'm curious, as I understand that answer this way: If you are using a Linux derivative or something like cygwin on Windows, then this is an efficient solution for reading only the third field ...
54 views

### How to retroactively merge cell change history according to a merge interval

I recently noted that there is an option in the options inspector to set a merge interval for cell changes. This (I think) prevents a quick series of changes from spamming your notebook history with a ...
196 views

### Conditional statements in intial conditions?

This is potentially a daft question, but I thought I'd ask it; I have some material free to diffuse in a boundary between rn and ro; I've been able to get it working nicely for neumann type boundary ...
226 views

### Runaway MathKernel!

I was running a simulation and everything went south (my fault, stupid coding error). So I quit the kernel. Everything was running very slowly, as if it were doing some kind of large calculation. ...
121 views

### Fast calculation of commute distances on large graphs (i.e. fast computation of the pseudo-inverse of a large Laplacian / Kirchhoff matrix)

I have a large, locally connected and undirected graph $G$ with $\approx 10^4$ vertices and $\approx 10^5$ to $\approx 10^6$ edges. Moreover I can bound the maximum vertex degree as $Q_{max}$. I ...
597 views

### MathKernel.exe capped to use only 13% of CPU?

I am using a Windows machine with 8 cores. No other process than Mathematica 8 is using CPU time right now - still the MathKernel.exe CPU usage does not go beyond 13%. My current computation takes ...
59 views

### How can I install a new stylesheet in CDF Player?

I've created my own stylesheet and I would like to install it in the CDF 9 directory, so when I apply it to a new Mathematica notebook and save it as CDF file, it will show it correctly. I used this ...
183 views

### Is it possible to marginalize one or several parameters obtained from fitting procedure?

Statistical model analysis package has a few fitting functions. Their arguments are data points, fitting model and parameters in the fit. The result is a set of best values for parameters, which ...
175 views

### Nonlinear recurrence relation

I entered the following recurrence relation into RSolve and it just gave the question back to me. $$a_{n+1} = \frac{(1+a_n +(a_{n−1})^3)} 3$$ Is there another way to get a formula for the nth term?
215 views

### differential equations with implicit functions

I have an ordinary differential equation that contains coefficient functions that depend implicitly on the independent variable via an algebraic equation. I am trying to go ahead and use NSolve to ...
172 views

### Negative power instead of fraction

Solve returns a solution in the form {{x->y/a^2 + y^2/a^7}}. Since I want to process the input (with another program) in terms of Laurent polynomials, I would ...
118 views

### Is there documentation on the comparative performance of Mathematica functions?

Recently I have been solving some Project Euler problems. I find there are always several ways to do the same thing. For example, one could join two lists like this: ...
144 views

### Is there a relatively easy way to add the “Cone of Influence” to a waveletscalogram?

I am analyzing time series data using the ContinousWaveletTransform function and plotting the results with WaveletScalogram. I ...
79 views

From time to time I get this error message when I save my .m file in Wolfram Workbench: LinkObject::linkv: Argument Null in Null is not a valid LinkObject I can't really figure out what causes this ...
160 views

### Project Euler (memory and speed issues)

Let n be a positive integer. An integer triple (a, b, c) is called a factorisation triple of n if: 1 ≤ a ≤ b ≤ c a·b·c = n. Define f(n) to be a + b + c for the factorisation triple (a, b, c) of n ...
283 views

### How to make 3D object smooth?

This thread considers mathematical methods here to make the 3D object smooth but this question consider how to achieve the goal of smoothing a 3D object in Mathematica. I want to get smoother ...
203 views

389 views

### Problem displaying eps exported histograms in Word 2010

I am having problems displaying histograms exported as .eps in word 2010. I don't have problems though displaying them in a specialized .eps viewer. (Postsript viewer from Rampant logic) I am writing ...
1k views

### How can I change the default font for all notebooks?

In Mathematica 8 I tried to change the default font for all notebooks in Format > Option Inspector > Global Preferences > Formatting Options > Font Options > large font selection screen > selection ...
141 views

### Changing Curl to use Colatitude

How do you change Curl in Mathematica so that it uses theta as latitude rather than as colatittude? Changing theta to ...
170 views

### Listing over multiple inputs (tensor rank > 1) in a compiled function

I'm trying to optimize the solution given by Michael E2 to my previous problem (Efficiently determining if 3D points are within a surface composed of polygons) which I figured would be relatively ...
101 views

### Strange double evaluation using MorphologicalGraph

(MMA 9.0.0 on Mac OS/X 10.8) Please consider the following snippet (this is as SMALL as I could make it -- my attempts at making a smaller repro-case eliminated the effect that I am investigating) ...
77 views

### From notebook,how can I change variable value with in .m file dynamically?

I wrote a function named Testing. ...
164 views

### Am I entering this 2-variable recurrence correctly?

I'm trying to solve this recurrence with two variables. ...
311 views

### mathematica startup time

I have Mathematica 7 and 8 installed on my laptop. Mathematica 7 starts quite fast, but Mathematica 8 is extremely slow to start. In the Option Inspector I canceled the "welcome screen" option at ...
631 views

### Installing Android ADT and Aptana studio plugins into Workbench

My question is a dual to this one. I use Workbench 2.0, but I am now interested in developing some Android Apps and Html projects. In order to do that, I need to install Android ADT and Aptana ...
142 views

398 views

### Inconsistent boundary and initial conditions: BC ignored altogether

Consider the following diffusion-decay equation with von Neumann b/c in the origin and Dirichlet at the other boundary: ...
139 views

...