# All Questions

11 views

### Fighting the Current

I am working a problem I am working on. A boat start across a river at the point (c,0) and points its bow directly across the river to the point (0,0). The parameter a is the river current velocity, b ...
5 views

### PDE of real-world system, integral boundary condition

I've stripped all the physical-significance for clarity, but I know that u[x,t] will be everywhere positive and continuous. here are the equations in Mathematica code: ...
6 views

### Problems with a constant term in an Integrate command

When asking Mathematica to integrate a function with Integrate, I'm getting drastically different results depending on whether I have a proportionality constant ...
4 views

### How to combine two or more groups while selecting form the unbalanced panel data if the number of obs is less than a scalar in certain groups

I have an unbalanced panel data. I want to calculate group statistics for each group. However, if ith group has less than K obs, then I want to combine ith and (i+1)th groups to calculate group ...
13 views

### Clicking on “Show all results” in a W|A pod hangs Mathematica

I am trying the brand new trial version. I type in =Forest Gump, then the Enter key. The input turns into a box with a plus sign in the upper right corner. When I ...
29 views

### How to import a file for processing but not for displaying?

Here's my problem, I want to take what I have now for code ...
20 views

### Speeding up a differential equation system with Events

I have the following differential equation system with periodic Events : ...
34 views

### Exporting a Mathematica Document as LaTeX [on hold]

I have tried several times to import a Mathematica document into a Wiki using the "Export As Latex" option. It never works. Of course I have the option of copying each stretch of text as text and ...
17 views

### Boundary value problem with FDM in Poisson PDE [on hold]

Thanks for the answers for my previously question. I find a solution for Poisson PDE in polar coordinates but now I have a problem for boundary ...
58 views

### Solve reports it can't handle my equation

I am trying to solve the following equation Solve[x ϵ + (-ϵ) x^-ϵ - c (-ϵ) x^(-ϵ - 1) == 0, x] Yields Solve::nsmet: This system cannot be solved with the ...
20 views

### How to handle solution returned by ParametricNDSolveValue in FindRoot

i was trying to solve a problem relative to root finding in a system of differential equations; here's a simpler case. With two distinct set of parametric differential equations, i'm able to find the ...
173 views

### How to sort digits in a string while keeping other characters untouched?

Now there is a string with digits and letters, for instance, "95uge678r3gi89hgfe30kgh063d51". And the expected output is ...
40 views

### Vector optimization with vector length as a free variable

I'm trying to solve the following problem: For a vector $v$ of length $c$, $\min \frac{\sum v[i]^4}{(\sum v[i]^2)^2}$ subject to $\sum v[i] = N$. I can solve this numerically for a given $c$ using ...
42 views

### Integer partitions and dice result probabilities

This is a Project Euler question, so no spoilers :] I was going to try to solve it by first finding how many ways a certain sum can be acquired from a number of dice using ...
46 views

### Using a progress bar in a functional expression

If we have a procedural construct like a Do loop or Table, it is straightforward to make a progress bar to indicate the percent ...
42 views

### How can I verify double integral solution?

I have a double integral as follows 1-(\int_0^\infty (\frac{Cje\cdot Cte \cdot e^{\frac{-w}{Cte}}}{(Cte+Cje \cdot w)^2} + \frac{e^{\frac{-w}{Cte}}}{(Cte+Cje \cdot w)}) ...
57 views

### What are the possible topics for graduate dissertation using Mathematica? [on hold]

I am a graduate student. I am planning to do one year project work on linear algebra using Mathematica. Until now i have studied transformations,elementary canonical forms ,rational and jordan ...
50 views

### How can I plot a graph of an integral?

I want to plot the following function: $$\int \left(\frac{\Gamma (x+1)}{2}-\frac{\Gamma (x-1)}{2}\right) \, dx$$
33 views

### Solve inequlities for certain variables. Reduce is not helping [on hold]

Working with few inequalities where two unknowns are there I wanted to find the relation between them. Reduce is unable to give me an answer. What could be done ...
44 views

### DSolve for a huge linear inhomogeneous ODE in parallel

I have a linear inhomogeneous ODE with constant coefficients, which I need to solve symbolically. The problem is that the inhomogeneity is sum of more than 100 terms (however, each term itself is ...
64 views

### Is it possible to write popular journal in Mathematica? [on hold]

As you know, Latex is the most popular toolbox in writing the popular journal articles, like PRL or APL. However based on the "style notebook" in Mathematica shows that the layout of Mathematica is ...
27 views

### Get function creating variables inside [on hold]

I want to use Mathematica to create this function in pseudocode: ...
37 views

### Get .NET Link to work on Raspberry Pi

Is it possible to get the .NET Link working on Raspberry Pi? I understand that Linux and MacOS versions of Mathematica come with .NET Link running on Mono and now even possibly under new open-source ...
42 views

### What does F[[1]] mean? [on hold]

I defined a function "F" and checked length, then I wanted to select terms I needed, and failed. One of my friends said I should typed something like that: ...
29 views

### Topics for master's project using Mathematica [on hold]

I wish to do 1 year project in linear algebra using Mathematica. What are linear algebra topics which can be implemented on Mathematica as part of 1 year graduate level dissertation.
61 views

### 4th-order Runge-Kutta method to solve a system of coupled ODEs [duplicate]

I am a beginner at Mathematica programming and with the Runge-Kutta method as well. I'm trying to solve a system of coupled ODEs using a 4th-order Runge-Kutta method for my project work. I have ...
78 views

72 views

### How do I smooth or remove jitter from an exported Graphics3D plot?

I have exported a Graphics3D plot as gif. But the plot shows jitter (You can see the yellow ball shows somewhat slight move around, which is expected to be still). How does this happen and how to get ...