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# DISCUSSIONS

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### Making a half closed bracket for display?

When I attempt to make a  half closed interval [a,b) in DisplayMath(Not for computation) Mathematica does not recognize that  the bracket is paired with the parenthesis and the sizing gets funny.  Anybody know a way to make it recognize this?

### Reverse engineering of complicated expressions

In Mathematica, everything is said to be an expression. As one becomes more proficient in this language, there is a natural tendency to construct expressions of ever-increasing size and complexity. Beyond that, in seeking to understand the Mathematica constructions of others, one can...

### Tries with frequencies for data mining

Here is post of mine proclaiming a Mathematica package and a guide for its usage to construct, manipulate, and visualize tries (prefix trees) with frequencies. ...

### Test to output only non-repeated elements in a repeating list?

I have a Nested List that returns a list of numbers which sometimes (but not always) begin to repeat.  Here is an example of an instance where the numbers begin repeating :  [mcode]In[3]:= NestList [ love[#, 37, 42] &, 1, 42 ] Out[3]= {1, 37, 16, 18, 10, 1, 37, 16, 18, 10, 1, 37, 16, 18, 10, 1, 37,...

### Simplifying visualization of VectorPlot3D

I'm trying to visualize a vector field, but it's very crowded. VectorPlot3D[{0, 0, Cos[x] Cos[y]}, {x, -\[Pi]/2, \[Pi]/2}, {y, -\[Pi]/2, \[Pi]/2}, {z, 0, 1}][img=width: 495px; height:...

### Particle Filter

Hi, everyone! I was unable to find any particle filtering example implementated in Mathematica. In other software packages it requires hundreds of lines of code, so I was just wondering if there are ways/shortcuts to do it easier here? If there are no examples, then let's implement one...

### Trying to do a weird sort thing in Mathematica, not sure how

So here's something interesting: The numbers which cannot be expressed as the sum of three squares are of this form: (4^x)*(7+8n), for x and n positive integers. I'm trying to have Mathematica generate an ordered list of these numbers up to, say, a thousand (just as an example). I can get it to...

### Guidance for assigning sql variables collected from InputForm control.

Good Day, I have a database that tracks support tickets. I have a SQL query that shows data over a specified date range. I'm hoping to use Mathematica to report on this data during weekly meetings. Below is the query... DECLARE @StartTime DATEDECLARE @EndTime DATESET @StartTime = '2013-12-01'SET...

### defining an implicit function

I'd like to do some GR calculations with the Kruskal-Szekeres coordinates and the Schwartzchild metric (or other metrics). I have the RGTC package, but I don't know how to define the metric with r, which is an implicit function of u and v (r/2M-1) Exp[r/2M]=u^2-v^2. Any way to define implicit...

### ImageProcessing with your Raspberry Pi

This is a very simple example of how you can do basic image processing on a Raspberry Pi. The following takes two pictures using the Raspberry Pi camera, and takes them about 1 second apart: image1 = DeviceRead["RaspiCam"]; Pause[1]; image2 = DeviceRead["RaspiCam"]; Next you can...

### Installing the Wolfram Language and Mathematica on your Raspberry Pi

Mathematica and The Wolfram Language are now available from ours and the Raspberry Pi foundation's software repositories for the default Raspbian Linux distribution for the Pi. If you're running a Raspbian image provided by the Raspberry Pi foundation, you can now install the software with...

### Labling properties in curated data output

Hi, I was experimenting with a search function a few hours ago and after a system crash I lost my train of thought and can't re-solve my problem. I was listing properties of Exoplanets using AstronomicalData, having the properties labled by the name of the planet. It was a very simple...

### Can not find other server in Lightweight Grid Manager

Hi, i have installed and activated the grid server on two machines, but both show only the localhost on the left panel (servers). In the manuals of Wolfram is described, that they would find others by using service discovery. I assume that the service doesn't work properly, because some...

Hi, I'm trying to link some C and Fortran files that I need to use via MathLink. As I try to link the libraries to these file I got errors. Here I write down the command line I use in my makefile and the errors I got [code] MAKEFILE: CXX = c++ MLINKDIR =...

### How do I solve this equation correctly?

Hello I did a force calculation in the attached mathematica code. Everything is working good as far as i see, until my last equation, solving for the forces. I'm under time pressure, and am very happy about any help which can solve this problem. The error I get is the equation "is not a quantified...

### Remote Kernel on Raspberry Pi

I am trying to connect to a remote Pi using the RDK. I guess there has to be a way to get the Mathematica kernel running on the Pi - without invoking the GUI frontend (i am running headless over SSH). But I am unable to figure out how to do that - has anybody already got that going? Any help is...

### ListLinePlot options to show whole plot?

Hi Everyone I got list :[mcode]lupok7={{0.1, 1}, {0.2, 1000}, {1.1, 200}, {1.2, 200}, {1.3, 200}, {1.4, 200}, {1.5, 200}, {1.6, 200}, {1.7, 100}, {1.8, 100}, {1.9, 100}, {2., 100}, {2.1, 100}, {2.2, 100}, {2.85, 280}, {4.3, 1000}, {4.4, 1000}, {4.5, 6350}, {4.9, 500}, {4.91, 64}, {4.95, ...

### Wolfram language understanding

Hi, folks, I'm now a proud owner of a full Mathematica licence and trying to understand the language. Actually I'll understand the following, small program:[mcode]Euler[a0_, b0_, steps0_, x0_, v0_] := Module[{a = a0, b = b0, steps = steps0, xinit = x0, vinit = v0},   dt = (b - a)/steps;   k =...

### where to find

if you want to get the pdf of  "Power Programming  with Mathematica" without going to an ebook download site, it's directly available at http://data.wolframmathematica.ru/working-files/WolframTechnologyCollection/books_mathematica/Power_Programming_with_Mathematica_The_Kernel.pdf not: david was...

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