# All Questions

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### Numerically solve 2nd order differential equation with singularity

Consider a second order differential equation with a potential that diverges at some generic value in the variable. For example: $$-y^{\prime\prime}(s)+\frac1{\mathrm{cn}{(s\mid k^2)}}y(s)=0$$ where ...
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92 views

### Compiled function crashes kernel when trying to list over different length arguments

I'm trying to speed up a tally/binning operation that I have to run many times. I have many lists of between 1 and 10 numbers from the range [1,5] and I want to ...
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105 views

### Design considerations behind O (a.k.a. BigOh, a.k.a. Landau Order)

This works without any warnings: O[Log[x]]. This raises a warning: O[x^2]. I have a few questions around this: Why is it a ...
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145 views

### Using stateful web services with Mathematica 9

The WebServices package in Mathematica 9 no longer seems to support stateful web sessions. This requires the client (i.e., the WebServices package) to pass back the HTTP Cookies that it receives from ...
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151 views

### Calculating the rank of a huge sparse array

By virtue of the suggestion in my previous question, I constructed the sparse matrix whose size is $518400 \times 86400$, mostly filled with $0$ and $\pm 1$. Now I want to calculate its rank. Since ...
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120 views

### Mathematica 7: “LessEqual::nord:” error when using NMinimize on a real function

I encounter a problem (Mathematica 7) similar to Strategies to avoid LessEqual::nord in NMinimize? but the advised strategies don't work for me. Also, I get different results with different ...
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127 views

### In .NET/Link, how do I not open multiple kernels?

I'm writing an ASP.NET page intended for multiple users. On the backend we have datatypes that are primarily mathematical, and interact with Mathematica for string-to-double evaluations, among ...
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281 views

### Reproducing the Integral Definition of the Modified Bessel function

I need to simplify some integral expressions in terms of special functions, such as the modified Bessel function of the first kind. See for example Eq. (5) on this page. Notice that the real ...
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160 views

### What are the known differences between Save and DumpSave, and how to account for them?

Edit: I changed the title and (slightly) the wording of this question in order to make it more easily answerable. If I evaluate this in Mathematica 9: ...
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303 views

### Incomplete implementation of units?

I've been playing around with the new units capability in MMA9 and I'm becoming a bit frustrated with what I perceive as an incomplete implementation of this capability and I'm wondering if there are ...
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91 views

### Associating symbol pages with symbols (Workbench)

Normally when you have symbol Abc, WorkBench creates a symbol page named Abc. Then when you make a build, type Abc and then press the F1 key, you are sent to the Abc symbol page. Suppose however ...
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213 views

### Faster simplification of linear combinations of some specific functions

After some profiling I've found that my program spends most of its time in the simplification step. The program uses my simplification function many times (over different data). My calculation is not ...
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225 views

### Realtime audio processing using Dynamic

Can I make real time audio processing with Mathematica in the same way I can do with images using Dynamic[CurrentImage[]]. I know that is possible to use ...
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712 views

### Limiting the use of discrete graphics card on Mac

Apple's laptop running Mac OS have a pretty nice feature to make the battery last longer: the dynamically switch between the low-power integrated graphics card and the higher-performance dedicated ...
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146 views

### Page Break Adjustment In Long Documents

Has anyone else had trouble in relocating page breaks in a long document? In a ~45 page long document I wanted to keep certain things on the same page. The system worked on the first three or four ...
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365 views

### Optimizing NIntegrate for higher PrecisionGoal

By default, NIntegrate works with MachinePrecision and its PrecisionGoal is set to ...
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344 views

### Sensitivity Analysis: Global Sensitivity and Screening

I have a model which accepts several input parameters and now I want to study the sensitivity to certain parameters as described in here: Cross Validated Answer and in Wikipedia. There is also a link ...
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401 views

### Using Mathematica as a data visualization front end for .Net applications?

I have a C# application that has 3-dimensional data that I wish to plot. Controls in C# for surface modeling are, in my experience, rather limited. I wish to have my C# application send the 3D point ...
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218 views

### How to produce the ILU0 or ILUT as stand-alone procedures on sparse matrices?

Mathematica uses the ILU0 procedures automatically to precondition large sparse linear systems; e.g. ...
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144 views

### ListInterpolation causing .cdf security problems?

I've made a simple .cdf that makes a function from a list of data I've provided in table form (using ListInterpolation) and ...
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365 views

### Increasing recursion speed in Hull-White trinomial tree calculation

First timer here and have been finding these boards very useful in learning Mathematica. I'm trying to implement a numerical procedure for the Hull-White trinomial tree in Mathematica. Despite using ...
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273 views

### Inverse of a large sparse Hermitian block matrix

I am looking for a method (if it exists) for the inverse of a large sparse Hermitian block matrix. The off diagonal sparse matrices, named δ are 4x4, and they have ...
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69 views

### Strategies to find curves on messy data using FindCurvePath

I have a set of data points that correspond to roots of a transcendental equation with respect to a parameter (the abscissa) which, by the properties of the system, define continuous curves (might be ...
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74 views

### Can Apple's Numbers spreadsheet link to a Mathematica function?

I use Apple's Numbers spreadsheet for a single thing, a double entry accounting model to understand complicated financial transactions. A current model depends on the value of a single initialization ...
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35 views

### How to robustly apply ToBoxes to a Dynamic expression?

Inserting a Dynamic object in a boxform expression messes up syntax colouring. See the following example. where the variable ...
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116 views

### Where to download the MathWorld package?

I was trying to run some notebook I downloaded from MathWorld, but lots of them need << MathWorldCurves I tried to google it , only to find this, but ...
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66 views

### ExperimentalNumericalFunction in NMinimize solution

I try to make a number of optimizations using this code: ...
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72 views

### Highlighting Mathematica code in LaTeX document

I was thinking about the best way to include Mathematica code in a LaTeX document with a nice syntax highlighting. I have tried the packages listings and minted (with pygments), which both claim to ...
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63 views

### Mathematica 9 Autocomplete Pop-up issue

I've just installed Mathematica 9.0.1 Student Edition on my Laptop and my Home PC. On my Laptop, it works just fine. But on my Home PC I get this weird issue of the pop-up command autocomplete window ...
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81 views

### Output most efficient Fortran code by mathematica

I am trying to output most efficient Fortran code by mathematica 9.0 with the method Simon provided: How can I get Mathematica to produce better Fortran code? The expressions is as follows: ...
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97 views

### Estimation of vector autoregressive (VAR) process

To estimate 1-dimensional VAR process (which is AR process) you can easily use functions EstimatedProcess or ...
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76 views

### What is the difference between NotebookEvaluate and FrontEndToken

I am wondering what exactly are the differences in using NotebookEvaluate[filename] vs ...
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33 views

### InverseFunction oddity

InverseFunction[ConditionalExpression[#, 0 <= # <= 1] &] InverseFunction[ConditionalExpression[#, -1 <= # <= 1] &] The first line produces ...
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215 views

### How to extract structured array data from DefineDLLFunction in Mathematica

I want to use my Bluechip PCI-ADC acquisition card in Mathematica via his dynamic link library “Bcdll32.dll”; (used to access functions on my PCI data acquisition cards). My problem is the function ...
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119 views

Converting between revolutions per minute (RPM) and revolutions per second (RPS) is not straightforward for me in Mathematica. I know that $1\; \text{RPM} = \frac{2\; \times\; \Pi\; ... 0answers 131 views ### Issue with FindCurvePath I have a problem with the function FindCurvePath. In some cases it crashes the Mathematica 9 Kernel. Here an example, where it crashes the kernel: ... 0answers 95 views ### How to keep$FrontEnd options from resetting?

I'm trying to get Mathematica to look in a different, version-tracked folder for the 'TextResources' files that it uses to build the Front End. I've prepended my version-tracked folder path to the ...
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93 views

### Manipulating the pitch of a sound

After reading Manipulating a continuous stream of sounds I have to ask about controlling the frequency of a Sin sound in a continuous manner, with a ...
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84 views

### how to efficiently jump between sections in a notebook?

I have functions defined in some section of the notebook and some cells where I use these functions maaaaany pages below in the same notebook. If I want to go and change the definition of the function ...
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158 views

### Strange Integrate behavior (a bug!)

The following two calculations should give the same result. After all, integration is a linear operation. I have pasted the code below in case you want to play with it. ...
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71 views

### Using quantifiers with free indices as declarative conditions in equation solving

This is a toy example: Is there a way to rewrite ...
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93 views

### Texture[] not working properly with Image AlphaChannel

I recently encountered a problem when combining multiple texture layers in an graphics object when the texture comes from an image with alpha channel. Apparently the alpha channel of the image passed ...
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81 views

### Is there something like MaxProcessorUsed?

For standard procedures it is easy to test if the implementation is better or worse than other by using Timing etc. It does not help us with creating ...
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147 views

### How can I find the source of a memory leak?

I found a really weird issue using NDSolveProcessEquations inside module. We start by setting HistoryLength to 0. After this we define a function which takes in an integer and creates a Table of ...
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159 views

### NDSolve and memory usage

After some googling, i've found similar problems around, but didn't find a 100% satisfactory answer, so let me ask here: I'd like to solve a 1+1 problem using the method of lines. In spherical ...
0answers
72 views

### What do the elements of the Parallel Kernel Status screen mean?

I just managed to get my multiple kernels up and humming on a new multi-core machine, which I am quite happy about. I am slightly at a loss, though, about the meaning of the different parts of the ...
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62 views

### How can I run MUnit tests outside of Workbench under Linux?

I would like to run MUnit tests from the command line. On Mac OS, I can do this: ...
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88 views

### Moles/Liters doesn't get simplified to Molar even though Molar*Liters gets simplified to Moles

Why can't Mathematica 9 simplify mol/L to M, when it can simplify M*L to mol? ...
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68 views

### Does one need to be careful about loading multiple (many) contexts or packages in the same session?

I have a number of large pieces of precomputed data which I am considering putting into individual packages in order to load them (via DeclarePackage) and unload ...
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98 views

### What range of ports do remote kernels use?

I'm trying to run a remote kernel, but my local system administrator is wary of opening up ports for incoming connections. Is there are particular range of ports that Mathematica uses to ...

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