# All Questions

950 views

### Convex hull of a 3D object?

I am trying to find a convex hull command for a Graphics3D object. Does it exist in Mathematica? ...
155 views

### Standard message definition construct

Why are the messages almost always defined like this (at least in packages): If[Not@ValueQ[function::usage], function::usage = "Usage message"] and not just like ...
101 views

I am using Mathematica 8. I would like to read some RData files which I have received. I do not currently have an installation of R on the machine with Mathematica.
294 views

### How to pass a list of arguments into HoldAll

I have a list of arguments (which in reality is lengthy): arguments = {a, b, c} arguments2 = {a_, b_, c_} f[Sequence@@arguments2] := a + b + c Note: It seems ...
238 views

### Evaluate Notebook from .Net

How is it possible to send the whole content of an existing notebook to Mathematica for evaluation by using NetLink/C#?
153 views

### Can anyone explain this strange behavior of InputForm?

In Mathematica 9.0.0, when to display the input form of two numbers, I come across maybe a puny problem. In order to focus on the problem, I will put up a simplified version. ...
932 views

### Methods for NonlinearModelFit

I am using NonlinearModelFit for a thesis project. I get quite different results if I change the Method to LevenbergMarquardt or QuasiNewton or ConjugateGradient ...
96 views

### What happened with the file?

What happened with this file? infile = "\\test data.txt"; outstr = OpenWrite[infile]; instr = OpenRead[infile]; Read[instr, Record]; Close[instr]; All ...
355 views

### Efficiently finding the positions of a large list of targets in another, even larger list

I have a big list. It contains nearly 60,000 sub-lists. It's structured like bigList = {{x1,y1,z1},{x2,y2,z2},{x3,y3,z3},.....,{x60000,y60000,z60000}}; I have ...
186 views

### ContourPlot from Vector Data

I have data in the form of x, y, vx, vy where vx and vy are components of the velocity vector at point x,y. I want to plot a contourplot of this. How can I do that since contourplot asks for three ...
540 views

### Clustering a set of points

I have a set of 2D points in the square defined by {-1, -1} and {1, 1}. These points typically form compact groups. I need to ...
327 views

### How to make 3D object smooth?

This thread considers mathematical methods here to make the 3D object smooth but this question consider how to achieve the goal of smoothing a 3D object in Mathematica. I want to get smoother ...
105 views

261 views

### DeleteDuplicates[] does not work as expected on floating point values

Here is my simple example, and in this case function DeleteDuplicates does not work as expected. I want to FindRoot of my ...
143 views

### Unexpected behaviour of SeriesCoefficient?

Following this question/answer I discovered and played with SeriesCoefficient. In particular, I tried ...
223 views

### SaveDefinitions->True changes the displayed image

I have a Manipulate[ ] that displays an image with a superimposed Locator object. It works fine when I have ...
511 views

### Find closed form expression for series expansion coefficients [duplicate]

Is there a built-in function that will find a general expression for the coefficient of the series expansion of a function? Series will only give the explicit ...
196 views

### Digital Elevation Maps (DEM) are Warped yet ReliefPlot renders as a rectangle - how do i join?

I downloaded several USGS Digital Elevation Maps (DEM files) corresponding to 12 adjacent areas. Each file Imports[] into Mathematica and I can render the individual ...
238 views

### Data structure for a list of actions

The idea: I need to generate a sequence of events then run a "propagator" over the list of events where the "propagator" will update the state of the following event. I can then write functions that ...
168 views

### How to use ScientificForm in computation

Lets say I want to add 2 values : ...