# All Questions

4 views

### Longest string of special characters

I was answering a question the other day and my answer had several special characters in a row -- it was something like FindRoot[#, {2}] & /@ {f1, f2, f3} which ...
34 views

### Recursive Integration

I'd like to evaluate the following recursive integration using Mathematica $$\ M(T) = \int_0^T\int_0^\infty e^{-\delta s}g(x,s)dxds\ +\int_0^T e^{-\delta s}f(s)M(T-s)ds\,$$ where $g(x,s)$ and ...
77 views

### Forecasting future Stock Prices II

I intend to do the following: I want to forecast future stock price under the following assumptions: The stock price is governed by the stochastic differential equation: dS = μSdt + σSdWt whereas ...
85 views

### How to declare a 3D vector variable?

How can I do vector calculations without telling Mathematica the vector entries? I have very many arbitrary linear combinations in $\mathbb{R}^3$ which I want to perform some general calculations on ...
965 views

### Having used Mathematica as a “gateway” language, where to from here?

I have been using Mathematica for about a year. It is the first language that I have attempted to learn. I'm still very much a newbie, but there are moments I feel more like I am waving than drowning. ...
201 views

### Embed Code Into Image

I often export images(plots, matrix, arrays, etc..) from mathematica which I end up putting in word documents or uploading to the web. The problem is that I often lose the original code and I am left ...
32 views

### Optimizing List Multiplications

I've got a list manipulation optimization problem. Consider a two-dimensional nxm list list1, and a three-dimensional nxmxm list, ...
59 views

### A simple ListPlot with different colours and a Tooltip

I know that the threads ListPlot with each point a different color and a legend bar and Extracting the coordinate of a particular point of interest from a ListPlot are somehow the answers to my ...
63 views

### Improving the plotting time of a very complicated expression

The quatity $R$ is defined by a complicated expression in terms of $a_1,a_2,\ldots,a_n$. Now each $a_i$ is a function of $x$, $a_i(x)$. I would like to know what is the most efficient way to ...
69 views

### AstronomicalData and Planetary Heliocentric (x,y,z) Velocity Components

I'm trying to find data on the heliocentric velocities of planets in our solar system and was directed to Mathematica's AstronomicalData in a previous topic. ...
102 views

### Distribute and analyze large datasets

I need to analyze very large datasets, and they obviously don't fit in a computer memory. I need to produce some statistics on these datasets, and this brings me here: How can I make some statistical ...
16 views

### Inverse of a polynomial in a truncated polynomial ring

Let $N$ be a prime, and $q$ be a positive integer. Given a polynomial $f(x)$ in $R = \mathbb Z[x]/(x^N-1)$, I want to find another polynomial $f_q(x)$ in $R_q = \mathbb Z_q[x]/(x^N-1)$, such that ...
162 views
+200

### How safe is the use of Block and InternalInheritedBlock

For many questions on this site answers are given which suggest to use Block and, especially for more advanced topics, ...
98 views

### Set all instances of Exp[-x_] to zero?

To simplify a huge expression efficiently, which involves a variable in a bunch of exponential functions going to infinity, I have tried to substitute ...
66 views

### How to use SaveDefinitions when using Rasterized Frames for a ListAnimate?

In another post (Is it possible to prerender animation in Wolfram Mathematica?) I got a good way to prerender frames in order to get a smooth animation using ListAnimate. I need to save the Animation ...
104 views

### NDSolve diffusion equation over/underdetermined

I have a feeling the solution to my problem is very simple… but my knowledge of differential equations is pretty weak. I am trying to solve a scalar diffusion equation (used in NMR spectroscopy, but ...
171 views

### How to run an external program in parallel with a Mathematica package?

Under Mathematica 8 (Linux x84_64) I was able to run an external program in parallel from a Mathematica package. However this procedure breaks down under Mathematica 9. Within my Mathematica package ...
30 views

### Why do I have to perform a second ReplaceAll in this InterpolatingFunction?

I have an InterpolatingFunction that I'd like to plot, and I wonder why I have to perform a ReplaceAll on the following function: ...
149 views

### Emulate Powerpoint behavior: Show additional cell content with each click

Is it possible to emulate powerpoint animation behavior during a presentation with Mathematica? Considering a notebook with cell of numbered items or even several cells, is it possible to display a ...
120 views
+50

### Underflow occurred in compilation

This code shown below works well for n<=10, if n>11, Mathematica gives the message CompiledFunction::cfne: Numerical error encountered; proceeding with uncompiled evaluation. >>. So ...
972 views

### How to calculate volume of convex hull and volume of a 3D object

I have a random 3D data points. How to calculate volume of the convex hull and volume of the object.
75 views

### How to calculate the volume of a convex hull?

Given a spatial curve represented by a parametric equation, is it possible in Mathematica 9 to calculate symbolically (or at least numerically) the volume of its convex hull?
44 views

### How to extract data of large function

Here I have one problem with command for I guess, but I am not sure. If I have function f[x] but not enough ram memory to save it in closed form, how to make code to compute it for chosen values. It ...
76 views

### How does Mathematica calculate the nth prime?

When I enter Prime[2000000000000], the two-trillionth prime, Mathematica gives 61427839512211 for the answer after several ...
3k views

### What is so special about Prime?

When we try to evaluate Prime on big numbers (e.g. 10^13) we encounter the following issue : ...
73 views

### How can i get the solution of complicated equation?

This is the equation about zeta. NSolve[equation] could not solve this equation. (I think it is too complex to solve by NSolve.) I want to know how can i solve this equation such a complicated ...
40 views

### how to set initial conditions when solving recursive equation with tables

I am solving a recursive expression with ParallelTable. Here is a MWE showing how I do it, and how I set the initial condition: ...
134 views

### Forecast Future Stock Prices - Brownian Motion - Again

excuse me, I think I have here a technical problem with Mathematica yesterday I posted the question with the title: Forecast Future Stock Prices - Brownian Motion I am still not very experienced but ...
73 views

### Every second evaluation in notebook front end is slow

I'm having a rather baffling problem that Wolfram was unable to help me diagnose, and I'm hoping one of you geniuses in residence here can figure it out. (I don't get access to the Technical Support ...
57 views

### Default FontFamily for PlotLabel

This is probably a rather basic question and I presume I am simply unable to make proper use of the Options[] function: I am trying to figure out what the default ...
36 views

### Using anonymous functions instead of module or block. Bad idea? [duplicate]

Here is an example function which returns True if a point p is on an (open) line segment (A, B) assuming that Orientation[A, p, B] returns 0 if the three points are collinear: ...
95 views

### Inverting a Spline-Function (Bezier or BSpline)

I would like to use a Spline-Function to describe a transformation from one range of reals to another, that is I would like to have a function which maps a value $y$ on $x$ and for simplicity let us ...
22k views

### Where can I find examples of good Mathematica programming practice?

I consider myself a pretty good Mathematica programmer, but I'm always looking out for ways to either improve my way of doing things in Mathematica, or to see if there's something nifty that I haven't ...
84 views

### Making a calculation with high precision

I would like to make the following calculation: 1/Sqrt[1 - (150^2 10^(-4))/(9 10^16.)] - 1 Mathematica 8 returns 0. The result is obviously not 0, but my ...
34 views

### How to open hyperlink (from web-embedded CDF) in new tab

my problem is that I can't handle this. Assumptions: CDF is web-embedded. (created by me) Hyperlink should open only after mouse clicking, no combinations with keyborad's keys are allowed. ...
27 views

### Constraining solution's sign with NSolve

I am solving some equations in 4 variables, however, there are many solutions which are basically the same but changing relative signs of each other ... i.e. {x->-1,y->1} and {x->1,y->-1}. ...
117 views

### Mapping multiple functions

This question was part of a course on Mathematica written in 1998. Each of the functions f1, f2, and f3 defined below has a root near x=2. Map an anonymous function involving FindRoot[] onto ...
81 views

### Setting OperatorSubstitution to False has issues with PDF and EPS exports. Are these bugs?

In Plot, I would like to use my own font, eg Inconsolata, for operators such as ×, so I set OperatorSubstitution to ...
141 views

### Can I use GoogleMap or other GPS data in creation of the Graphs?

I have following graph. ...
56 views

### “Save Graphic As…” does not include plot legends

I am creating some plots with Show but unfortunately the PlotLegends seems to be out of the bounding box when saving the graph. ...
69 views

### Finding all simple paths between two vertices in a graph

There are built-in methods to find a shortest path between two vertices in a graph, and the question on finding all shortest paths between two vertices has gathered quite a bit of attention. A path ...
71 views

### How can I set multiple values to local variables in a Module?

Multiple assignment is supported by Set. How can do something similar in Module expressions? If I could do it, whould there be ...
284 views

### Internal “Periodical” functions in version 7

In version 7 there exist these Internal context functions: ?Internal*Periodical* ...
77 views

### Error messages when using NInverseFourierTransform

I have two functions that I need to inverse Fourier transform and I was trying to get Mathematica to help me. I tried simply using theInverseFourierTransform ...
422 views

### Create an adaptive amount of local variables for error propagation

I intend to write a function which calculates the result and the error for any formula with any amount of variables using the Gauß Error Propagation. The error $dR$ for a function $R(a,b,c)\,$ and ...
119 views

### Notebook vs. DocumentNotebook; display a Notebook inline, like a DocumentNotebook

If you evaluate a DocumentNotebook[] expression in the front-end, it nicely displays inline, inside of an output cell in the current notebook: For my purposes, ...
81 views

### Projection of a set of 4D points to the 3D space

Consider the following set of points in the 4D space: ...
174 views

### Bags and non-standard evaluation

What can internally be happening here? Is the evaluator just messing with us and going non-standard because it's a Bag? Or am I just not seeing how something like ...