# All Questions

70 views

### Can I make IsomorphicGraphQ consider other properties besides the EdgeRules?

Consider two graphs, which are isomorphic to each other based on the vertices and edges, ...
71 views

### Tensors constructed using KroneckerDelta's - and/or displaying KroneckerDelta as a matrix

I am doing some work in elasticity and as a result am working with tensors. In particular, I would like to calculate the contraction of a fourth order tensor (the stiffness tensor) with a second order ...
16 views

### How can I distribute redefinitions of system functions to parallel kernels?

I'm having some trouble getting my parallel kernels to get wind of user redefinitions of system packages, and I'm looking for the cleanest way to do this - preferably using DistributeDefinitions. To ...
68 views

### Dynamic Plot of non-linear function within DynamicModule yields dynamically changing constant line instead of expected behavior

I'm having a problem with DynamicModule; the code below produces a plot with a line that changes value, based on the slider positions of the parameters, which is very nearly what I want; I would ...
50 views

### Fastest way to import a large undirected graph from .ncol format

Problem: I have a large undirected graph in the .ncol format, and want to get it in to Mathematica. I understand that Mathematica doesn't natively support the ...
101 views

### Mass distribution in NDSolve

I'm trying to model the solar system with NDSolve, basically a numerical n-body solution. I model the initial positions of bodies from a data set thusly: ...
37 views

### Programing the Euler characteristic

The Euler characteristic theorem is a wonderfull theorem not only from the mathematical point of view but also from the scientific view point. Here is a version that I would prefer to program by ...
40 views

### How to read import VRML (.wrl) into Mathematica

I wonder if there is a way to Import VRML objects, e.g. here. The Export of These formats is provided but I did not found a way to Import it. Can anyone help here? (The Goal is to build a model of ...
60 views

### Underflow occurring in computation

I've got an "Underflow occurred in computation" problem. Here's a simplified version of the code: ...
23 views

### Can mathematica's GraphDistance handle complex weights? Or unknown parameters eg. 'x'?

The EdgeWeight property states that the EdgeWeight can be any expression and the GraphDistance function states that in a weighted graph, it will return the minimum of the sum of the weights. So if I ...
56 views

### Rationalize error

The docs state that "Rationalize[x,dx] yields the rational number with smallest denominator that lies within dx of x." However, testing this out it appears to be false. ...
6 views

Why I can not get a result of 2 while giving input of 2.2 as a float. With logic that 2.2 gets converted to 220, than when it goes through the first for loop I am going to get a remainder of 20(which ...
67 views

...
33 views

### Parametric region instead of 3D plot when using parametric plot [on hold]

I want to draw a parametric region, that is, a 2d-graph using 2 parameters. However, each time I use ParametricPlot with 2 parameters, Mathematica interprets it as 3D plot. Not even the examples ...
40 views

### Solving linear system with non-commuting coeffcients

Is there a way to solve a linear system of equations where the coefficients do not commute? (Warning: my two-days of looking so far suggest this may be an unsolved math problem, but I figured I could ...
106 views

### Inflate and unite a list of 0D to 2D regions

I've got a List of BoundaryMeshRegions, created via ConvexHullMesh: ...
127 views

### What is the symbol FENone for?

I have run into the symbol FENone multiple times. What is this symbol, and what is it designed to indicate? All I could find is that FE indicates the front-end, but it's unfortunately a very ...
192 views

### Curve fitting with this modified integrated log-normal function and extracting fitted?

The data to be fitted is for y vs x. We have y and x points. We do not have data for w. In fact, w variable is being varied during integration from 1e-9 to 100e-9. The fitting parameters are Ms,sigma,...
59 views

27 views

### Pass list title as argument? [duplicate]

I have a function that works with a list and outputs it. Is it possible to also get the name of the list as an argument? Right now my code is ...
86 views

### Making a bouncing ball simulation interactive [closed]

Problem A ball initially at height $h_0$ above a horizontal surface is dropped at time $t = 0$ with zero initial velocity. When it arrives at the surface, the ball bounces in the vertical ...
44 views

### ErrorListPlot - Problem with PlotRange

Consider the following example: ...
27 views

### Reevaluate a cell when using manipulate

I am trying to use a manipulate, but one of the plots inside requires that a lengthy cell (group) is evaluated again. Basically I have a variable 'intensity' which depends on the function I start ...
97 views

### Getting a function/solution for an ODE over 2 dimensions

I am trying to calculate the laminar flow field within a tubular reactor. The relation between axial velocities, viscosity and pressure drop is given by this differential equation with the axial ...
55 views

### Framed Background and ImageMargins

I want to make some description on my plots, but I can't make it good. First I tried this: ...
2k views

### Programming the fiver game

Obviously, even if I ask a lot of question I am, obviously, still a dummy!!!! I want to program the fiver game. It's a very simple game played solitary on a $5 \times 5$ the rule is elementary : if ...
151 views

### Finding eigenvalues for Laplacian operator for 3D shape with Neumann boundary conditions

I've just begun to use the Mathematica so my question may seem to be naive. To get a solution for my problem I looked at the example provided in help. ...
239 views

### How to fit a Distribution to data that already looks like a distribution?

I have a set of data that is already ordered as a distribution. Here is a picture worth 999 words: I tried FindDistributionParameters, and ...
41 views

### Fibonacci Sequence (Home Work) [closed]

3. The Fibonacci sequence F0, F1, F2, F3,... is an infinite sequence defined by the two initial values F0 = 0, F1 = 1 and the rule Fk = Fk - 2 + Fk - 1 for all k ≥ 2. Let M = (1 1 ...
6 views

### Find least number of radial-subgraph of a graph [migrated]

Background: Here is a group G of a people, one maybe another's friend. How to select least number of people to be a leader of a subgroup, so that everyone in the group G has a friend as a leader? ...
263 views

### Fractal basins of attraction in a Magnetic Pendulum

I am trying to write a Mathematica program that realizes a graphical approximation of the basins of attraction in a Magnetic pendulum subject to friction and gravity, in which the three magnets are ...
177 views

### ColorFunction with the function of luminance

I want to have a DensityPlot or ListDensityPlot, whose color function is a rainbow but whose luminance is given by another ...
52 views

### Finish(Asynchronous)Dynamic[]

I have a question deriving from a recent topic Synchronizing Dynamics with EventActions. tl;dr; How to authoritatively explain the influence of ...