# Tagged Questions

Questions on finding existing Mathematica implementations or expertise to address a clearly stated problem.

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### How to set up a simple Monte Carlo Simulation

there is a 1% chance that there will be a scattering event, if there is a scattering event the direction of scattering will be determined by a random sample of the custom[a_] function and if there is ...
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### Changing from Cartesian to polar coordinates in partial differential equation [duplicate]

I have a partial differential equation: $$\left(x^2+y^2\right)\frac{{{\partial ^2}u(x,y)}}{{\partial {x^2}}} + x^2\frac{{{\partial ^2}u(x,y)}}{{\partial {y^2}}}=0$$ How to change from Cartesian to ...
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### Problems when solving a nonlinear PDE system with NDSolve

The nonlinear PDE system is actually extracted from a research paper published in 2000 Here is the paper link The authors solved the system by using an ordinary differential equation integrator in ...
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### How to write this Matlab code in Mathematica

I have a small hiccup here. I am trying to write my Matlab code for a dynamical system in Mathematica. I have managed to get most of it except one part. The Mathematica code for the system is <...
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### Hopf Bifurcation for a non-linear dynamical system [closed]

I am very new to mathematica and also to Hopf bifurcation or any bifurcation for that matter. But I am trying to obtain a Hopf bifurcation for a dynamical system. Now, so far, I cannot find any Q&...
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### How to create tickets on a Jira server using Mathematica?

Has anyone ever tried to use Atlassian's rest api from Mathematica? I'd love an example of a post request to create a ticket with specific properties. With cURL, it's easy: ...
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### Coppersmith's algorithm like Pari's zncoppersmith?

Is there some Mathematica package (or built-in that I missed) available, more or less equivalent to Pari's zncoppersmith function? Paraphrasing that source: given ...
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### how to use a tree as a key to construct a table of key values

I have an interesting problem that I was able to summarize in the form of trees, sets, and key value pairs. I have the following sets of keys and values \begin{aligned} k_0 &= [A]...
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### How do I make Mathematica show me the solutions that it has found while it is searching for them

How do I make Mathematica show me the solutions that it has found while it is searching for them, specifically in this: ...
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### Linearized Einstein Equations with Mathematica

I need to compute the linearised Einstein Equations around a fixed metric $g_{\mu \nu}$ which is not the flat metric. Someone knows any Mathematica package or a review that can help me?
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### Linearised Einstein equations

I need to compute the linearised Einstein Equations around a fixed metric $$g_{Î¼Î½}=\text{Minkowski metric} + h_{Î¼Î½}$$ which is not the flat metric. Does anyone know a Mathematica package or a ...
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### Draw lines between all neighbours

I have seen this question, but what I want is a bit different. I have a set of data (blue points) and I would like to end up with something like this: , i.e. joining each site with all its (nearest)...
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### How can this type of optical illusion be created in Mathematica?

I see these around the web and would like to make them in Mathematica. Combining them in an array is actually quite mesmerizing!
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### Equilibrium solution to system of 4 ODEs with 6 parameters [closed]

I have the following system of 4 ODEs of 4 state variables $(M_{U},M_{R},F_{N},F_{M})$ and 6 parameters $(\alpha,b,\gamma,\mu_{M},\delta,\mu_{F})$ that I am trying to find the equilibrium solution for:...
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### 3D-Plot of a list of complex numbers and a list of real numbers

I'm a newcomer to Mathematica, and I'm having trouble with the following question. Say we have a list of complex numbers list1 and a list of real numbers ...