# All Questions

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### Tracking features where ImageFeatureTrack finds none?

How is it possible to track common features in the following sequence of images (e.g. holes or corner points along the top margin), ? I have had no luck with ...
72 views

### How to define UpValues about the derivative of NBSpline when the length of knots is unknown?

Description In the book “Programming in Mathematica” 3rd by Roman.E.Maeder, the author gives a topic about A new Mathematical Function in section 8.4. For instance, for the following formula： ...
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### Exported CDF file does not include GeoGraphics [duplicate]

I'm trying to display a map on manipulate and the case is .nb files shows it but when I export it to .cdf this format not show the GeoGraphics map ...
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### How to extract part of association?

Considering an association: asc = <|"a"->1, "b"->2, "c"-><|"e"->3, "c"->4|>, "d"->5, "e"->6, "f"-><|"g"->7|>|> How ...
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### A book or tutorial/guide for “Systems Interfaces & Deployment”

I'm looking for a complete guide (call it a book, tutorial, guide or whatever) about some programming topics which are not enough covered by Mathematica Documentation Center, in my opinion. Topics ...
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### Convert .csv Dataset and store in Databin [on hold]

Trying out the new Databin product in the Wolfram Cloud. I have a simple ,-delimited .csv file with a header row which I have imported using the follwing: ...
2k views

Can users of Mathematica on Windows 7 or Windows 8/8.1 upgrade their computers to Windows 10 – a process that began today? Does Mathematica work? Are all the settings, licenses, access to files and ...
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### Interpolating function for data with five independent variables [on hold]

I have to optimize the risk reward of a financial structured product depending on several variables: the tenor (between 12 and 36 months), the type (american, european), the Knock In (KI) ...
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### How to disqualify a rule [on hold]

Executing this line Assuming[x < 0, x -> 10] Expected output: False Say x -> 10 is a root of a polynomial ...
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### Another Integration to prove [closed]

We want to prove this integration $\displaystyle\int_{-\infty}^{\infty} \frac{x sin (x)}{1+x^2} = \frac{\pi}{e}$
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### Random variable within Manipulate: how to make it independent on other controls

The code sample: ...
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### What's the last whole number before a googolplex? [migrated]

"What's the last whole number before a googolplex?" My six yr old asked me this, this evening, how does a math challenged dad answer this?! A googolplex is hard enough as it is to imagine or ...
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### How to increase the thickness of the edge in a random image

This is a Voronoi Diagram. I really want to know how to change the thickness of the "wall" of each V-cell, in another words, the thickness of the edge in this diagram.
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### List all “duplicate” elements in Tally

Tally[list,test] can use a custom function test to judge if elements are equal. But the output will only give the first element ...
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### RegionPlot generates unwanted mesh lines [duplicate]

Consider this example: ...
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### How to find roots of a bi-quadratic equation having symbolic coefficients? [closed]

I have the following equation with the symbolic coefficients specified using syms which I have been trying to solve in MATLAB ...
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### Usage of StringTemplate

The documentation for StringTemplate has the following example ...
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### Plot a circle and create a 3-D revolution plot out of it

If I have the equation (x-2)^2 + (y-2)^2 == 1 I can use a ContourPlot, however am having trouble changing the axes origin. I ...
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### ImplicitRegion gives arbitrary boundaries

This question uses Mathematica 10.2.0.0. equation1 is the major unbounded region I would like to generate: ...
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What I did: ...
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### Confusion over blank sequence in pattern matching

My overall goal was to produce a list of heads used in a graphics output. For an example I used: ...
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What I did: ...
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### How to use function, NIntegrate, FindRoot together? [duplicate]

Using a function in NIntegrate works fine... ...
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What I did: ...
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### Prevent 10.2 from creating “Wolfram Mathematica” directory on Linux

Since upgrading to version 10.2.0.0, every time I start the Mathematica front-end it creates a "Wolfram Mathematica" directory under my home directory. (It never seems to put anything in it.) Anybody ...
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What I did: ...
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### Fishing for monomials in a nested or partially factored polynomial stream

I have a problem where I'd like to be able to take a multivariate polynomial whose variables are nonscalar and is not written explicitly as a sum of it's nonzero monomial terms and determine which ...
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### Function to list Collatz sequence doesn`t work [duplicate]

I am new to Mathematica and was trying to make a function that lists the Collatz sequence stating with a given number, but I can´t get it to work. Here is my function: ...
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### Mathematica file transforms to some strange format

I am facing a very annoying problem with mathematica file. Sometimes it is automatically saved in a "pdf like" bizarre format. Each input and output line of the original (.nb) file starts with In[#] ...
107 views

### How can I write a loop to get many values from a solution?

I am looking at the value of x[t] at day t = 200 over several years. I tried to do it using a For-loop but it didn't work. This ...
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### Binomial decomposition of a list? [closed]

Given a list L with n elements, I would like to generate all possible unordered subsets of ...
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### Potential flow over cylinder with FEM: Pressure field is flipped

Much in the fashion of a few problems already answered on Mathematica.SE (1, 2), I am trying to solve the Laplace equation in velocity potential $\phi$ to simulate irrotational, inviscid flow over a ...
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### Speeding up the built-in Rudin-Shapiro and Thue-Morse sequence functions

Version 10.2 introduced two well-studied sequences as functions: the (Golay-)Rudin-Shapiro sequence (RudinShapiro[]) and the (Prouhet-)Thue-Morse sequence (...
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### How to plot a function defined by an expression containing integrals [duplicate]

It seems Mathematica does not like it when it is given a function defined by an integral to plot. How would one plot a function $F(x)=\int_0^x\int_0^xf(t,s)dtds$ on a given interval? Edit In ...
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### Pulling variable out of NonlinearModelFit [on hold]

I have a fit, Dynamic[f1 = NonlinearModelFit[d1, a Exp[-(b (x - c1))^2] + yoff, {a, b}, x]] Where I need to be able to access ...
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### Evaluate result from NDSolve is slow [on hold]

I am calculating some partial differential equations with NDSolve, it does it well. However when I try to Evaluate the ...
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### Find sub-sets of vanishing additions or subtractions from a list?

Let's say I have a list L containing n numerical numbers. Now I want to find all sub-sets of ...
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### NMinimize fails on Mesh?

Context I want to identify the minimum of a solution of a PDE found on a mesh. Problem I do not understand why NMinimize fails on a mesh? As a test case, ...
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### Multivariate Equation solving [closed]

I have the following equation: r^(1 + Rho) - r^Rho (-1 + Mu) - z Rho == 0 I searched the list but I couldn't come up with a solution. Any help is appreciated. ...
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### Store Eigenvalues of a matrix in a list for varying one symbolic variable [closed]

I have a matrix r which has a symbolic variable Rs which varies from 0 to 2. I want to find the eigenvalues using ...
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### Import a column of data, make a matrix from it and export it WITHOUT curly braces

I'm new here and with Mathematica, too. I want Mathematica to import data from a txt file (it has one column of data). These entries are z-values. From this I want to make a matrix - 508 entries make ...
31 views

### Relative factorisation with scalar quantities

I'd like to find a natural way to tell mathematica that a given unknown in a polynomial should be treated as a number, unlike the other variables. Typically I'd like to sum two polynomials in several ...
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### List connectivity of points in discretized mesh

I'm trying to automate the extraction of the points and a compatible connectivity list for meshes created using the DiscretizeRegion or similar method. If I create ...
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### How to obtain the value of a single symbol with mathlink

I am trying to write a (C) routine which reads the value (a list) assigned to a single symbol in mathlink. I tried things like ...
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### How may I avoid ParametricPlot3D clipping? [duplicate]

What I am doing: ParametricPlot3D[{Cos[z/2]^6 * Cos[t],Cos[z/2]^6 * Sin[t], z}, {t,-Pi, Pi},{z,-Pi,Pi}] What I get: What I want: what I get, but without the ...
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### Solve an inequality involving a sum with a parameter

Good day. I am new to Mathematica and I am looking for advice. Is it possible to solve $$\sum_{k=0}^{n} \frac{p^k}{k!}>0$$ for $n$ where $p$ is a parameter? When I do ...
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### Generating Meshes with Conforming Boundaries for FEM

I would like to solve a PDE on an annulus with some boundary condition that relates the inner circle to the outer circle. (For example, periodicity along radial lines). If I use a finite element ...