# All Questions

103 views

### How to efficiently find parts of a string with beginning and ending specified?

I'm trying to find specific URL addresses from a html document. The addresses can be found between the strings "href=\"" and "\" class=\"listing". The problem is not including strings like this: "href=...
133 views

### I am trying to solve a set of coupled differential equations with known boundary conditions using mathematica [duplicate]

Here are my differential equations and boundary condition. ...
131 views

### Approximation of $f(x)$ at large values of $x$?

Suppose you a function $f(x)=1/x+x^2$. At large values of $x$, it is closely approximated by $f(x)=x^2$. Can Mathematica do this for me for a more complicated function? How would I input the ...
67 views

### interpretation of parentheses in ToExpression

The code below generates the plot "z" and gives a name to the "Show" function. ...
281 views

### MathLink dependencies: “LNK2019: unresolved external symbol _MLMain”

I am trying to compile the MathLink examples included with Mathematica. I am careful to ensure that the libraries are present in the Visual Studio folder as indicated by the installation manual. I am ...
437 views

### Easiest way to create a binary variable

Binary variable is often used in applied statistics. However, I had a hard time to figure out how to create it. Somebody might have better idea how to do it. I have two variables say x and y as ...
67 views

### Using Inner to calculate a log likelihood

I am trying to use the function Inner to calculate the sum of log likelihoods of a custom probability distribution 'custom' applied to a vector of data 'vData'. The custom distribution changes ...
25 views

### Sort giving unexpted output! [duplicate]

I want to perform sorting on a list of strings, If i take for example the list s s={"test9","test8","test10"}; If i perform the Sort function i will get: ...
46 views

### Auto generate parameters in Manipulate

I have a manipulation problem that I can't find a solution online. Here is a simple example from my case. ...
120 views

### Importing, sorting and exporting lists

I have several TSV lists (.txt) of something like 2000*2000 numerics (e.g. 1.8645) to import ...
170 views

### Tooltip with position of the list element

I want to use Listplot with Tooltipthat displays Positionof the element I'm hovering over. <...
179 views

### How can access to curated data needed by GeoRegionValuePlot be speeded up?

Seems that GeoRegionValuePlot requests data from the internet multiple times to process its plot. As an example, let's graph smoking per capita worldwide. ...
130 views

### Slow NIntegrate over complicated domains (sometimes)

This is no longer a problem with Mathematica 10.* where I can use regions to do the integrations Overview I have a very large matrix I need to calculate where each element requires the integration ...
138 views

### MeshRegion and BoundaryMeshRegion differences between 10.0.1 and 10.0.2

Original text My need is simple: I have many non-overlapping regions that I will need to use as plotting domains and integration domains. The new region type operations in Mathematica 10 has made my ...
630 views

### Where does this gray solid line come from in plot? [duplicate]

Where does this gray solid line come from? It's not y=0 or x=0. Sometimes it occurs, sometime does not. I can't really produce a smaller example that does the same thing as it is really "random". The ...
95 views

### DSolve gives back input (coupled ODEs)

I'm trying to solve a system of coupled ODEs, however I keep getting back the input whenever I try to solve with DSolve. The variables I'm solving for are complex. Here's what I have : ...
73 views

### Is there an equivalent to MovingMap[] for functions that work on more than one TimeSeries?

I have a family of functions that require two TimeSeries (A and B). As a trivial example, imagine a function called beta[tsA_,tsB_] that determines the slope of the linear regression line for the ...
63 views

### How to get approximate (decimal) output for ArcCosh[e^x] [closed]

The specific input I'm using is ArcCosh[e^1.5400733368255632], how do I get this to give me an output in decimal form?
167 views

### NMinimize in one-dimensional Interval

An Interval should be a one-dimensional region, so a region. I tried to minimize a function over an interval, e.g.: ...
704 views

### Remote Kernel configuration works in v9 but not in v10

I have both v9 and v10 currently installed on my computer (Windows 7). For reasons that are not entirely clear, if I create a new remote kernel in one version, it is accessible to the other; however, ...
73 views

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434 views

### Getting the polynomial from a polinomial root equation

After doing some preceding work I end up with a polynomial equation that should look something like this: Eq = c + b x + a x^2 - d x^2 == k I would like to ...
183 views

### How to get the correct latitude and longitude coordinates using FindGeoLocation on street addresses [closed]

Have a list of street addresses: ...
45 views

### Why does Mathematica provide incosistent convergence conditions?

In[1]:= Clear[a, n] In[2]:= SumConvergence[(n^(n - 2))/((a^n)*(n!)), n] Out[2]= Abs[a] > E In[3]:= SumConvergence[(n^(n - 2))/((E^n)*(n!)), n] Out[3]= True All ...
113 views

### Package and imbricated compiled functions

I would like to build up a Mathematica package Pck which contains compiled functions. However when loading this library I obtain an error. When reduced to a minimal ...
64 views

### How to stop code from evaluating same thing twice?

I have this code for evaluating some fractions: ...
143 views

### Tools for MathLink traffic analysis?

I noticed that the documentation for LinkSnooper says that it is "obsolete". I don't have any experience with this tool, but I thought it looked interesting after seeing results it was able to provide ...
46 views

### Filling a region defined by a reduce command

I'd like to shade the region defined in the xy-plane produced by this code: ...
122 views

### How do I create a logical permutation expression automatically

How can I create a permutation automatically with logical expressions ? For example (2 logical variables): ...
229 views

### InstallR on OS X with external R installation on 10.0.1.0

I had no problem to follow the instructions given at InstallR on OS X with external R installation to get an external R working with Mathematica 10.0.0.0. However when Mathematica was updated to 10.0....
70 views

### ml32i1m.lib and ml64i3m.lib Files

I have to install a package to use together with MatLab (http://www.mathworks.com/matlabcentral/fileexchange/6044-mathematica-symbolic-toolbox-for-matlab-version-2-0]1) that requires locating files ...
168 views

### How to control precision of parameters in NonlinearModelFit?

I am using NonlinearModelFit for fitting a dataset to some complex numerical model function that depends on a few parameters. The final required precision of these parameters is very low, like 3 ...
80 views

### TransitiveClosureGraph doesn't return self-loops for nodes that are in a cycle

This is from boost library documentation: The transitive closure of a graph G = (V,E) is a graph G* = (V,E*) such that E* contains an edge (u,v) if and only if G contains a path (of at least ...
81 views

### Basic stylesheet customization of “Text” cells not working for me

I have learned much from other posts about stylesheet customization. Here is my procedure: Step 1 - Open a new, empty document. Step 2 - Format..Edit Stylesheet. I have added the following ...
557 views

### Define a function with variables linked implicitly

I would like to define a function $f(x,y)$, with the variables x and y linked by an equation implicitly, so $f(x,y)=f(x(y),y)=f(y)$. Eventually I would like to draw a graph with $f(x(y),y)$ being the ...
2k views

### How can I deploy DLL files created by a Fortran function and call them from Mathematica

This is my Fortran function, established by Intel visual Fortran 11.1 ...
48 views

### Cursor function for 3D plots [duplicate]

I will illustrate my question with a picture from a matlab plot. Is it possible to do the same thing with Mathematica plots in 3D as well? The above is from a 3D matlab plot. I can get tooltips ...
69 views

### ANOVA on data with different lengths

I have data in the following form: ...
386 views

### Solve a PDE over a region defined by a Bezier patch

I am using NDSolve to find the solution to a PDE over an arbitrary domain. The domain is specified by a Bezier patch. ...
117 views

### converting DO loop into NestList form

I would like to rewrite this Do loop using NestList. Can you help me? ** DO loop ...
723 views

### How can a big table be treated as a database?

I often work with big tables that I want to treat kind of like a database. Here's an example table. ...
210 views

4k views

### I'd like to display field lines for a point charge in 3 dimensions

I'd like to display field lines for a point charge in 3 dimensions. Not a force field (short arrows) but continuous field lines that start on the charge.
100 views

### Is there a way to split a list (or number) into a specific number of parts?

I know there's a way to split a list into parts of a specific length, and I know there's a way to get all possible partitions of an integer. But I was wondering if there's a way to partition a list ...
417 views

### How to make a cylinder with bottom that shows hidden part of edge as dashed curve [duplicate]

I am learning a bit about TikZ and found a nice feature in its graphics, that I am having hard time duplicating with Graphics3D. It is making a ...
16k views

### Figuring when the minute and hour hand coincide on a clock

I would like to list all possible times in a 12-hour period, where the hour hand overlaps the minute hand completely. This is really a question about three distinct things - to be done in Mathematica ...
373 views

### Calculate area under a polyline

Consider the following code: tmp = {{0, 0}, {1, 1}, {2, 1}, {3, 2}, {1, 0.5}}; ListLinePlot[tmp, Filling -> Axis] Is there any easy way to compute filled area?...