1
vote
0answers
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 ...
0
votes
0answers
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 ...
0
votes
0answers
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 ...
4
votes
2answers
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 ...
26
votes
7answers
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. ...
8
votes
6answers
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 ...
2
votes
1answer
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, ...
-1
votes
2answers
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 ...
1
vote
0answers
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 ...
3
votes
1answer
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. ...
8
votes
2answers
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 ...
0
votes
0answers
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
...
28
votes
1answer
162 views
+200
How safe is the use of Block and Internal`InheritedBlock
For many questions on this site answers are given which suggest to use Block and, especially for more advanced topics, ...
1
vote
1answer
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
...
0
votes
2answers
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 ...
1
vote
1answer
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 ...
8
votes
1answer
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 ...
2
votes
1answer
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:
...
2
votes
1answer
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 ...
1
vote
2answers
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 ...
16
votes
2answers
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.
7
votes
0answers
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?
-1
votes
1answer
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 ...
2
votes
1answer
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 ...
29
votes
2answers
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 :
...
0
votes
1answer
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 ...
2
votes
1answer
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:
...
-3
votes
2answers
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 ...
5
votes
0answers
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 ...
5
votes
1answer
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 ...
1
vote
0answers
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:
...
3
votes
3answers
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 ...
193
votes
10answers
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 ...
1
vote
3answers
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 ...
1
vote
0answers
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.
...
0
votes
1answer
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}.
...
2
votes
2answers
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 ...
6
votes
2answers
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 ...
5
votes
2answers
141 views
2
votes
1answer
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.
...
0
votes
0answers
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 ...
3
votes
1answer
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 ...
12
votes
2answers
284 views
Internal “Periodical” functions in version 7
In version 7 there exist these Internal` context functions:
?Internal`*Periodical*
...
0
votes
1answer
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 ...
14
votes
3answers
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 ...
9
votes
1answer
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, ...
0
votes
1answer
81 views
Projection of a set of 4D points to the 3D space
Consider the following set of points in the 4D space:
...
9
votes
2answers
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 ...
3
votes
3answers
65 views
Counting multiplications (complexity function)
I'm trying to count the number of times multiplication appears in an expression (for the purpose of constructing a ComplexityFunction that would help me simplify a terrible algebraic expression for ...
17
votes
1answer
106 views
What does Internal`InheritedBlock do?
What does the function Internal`InheritedBlock do? How is it different from the regular Block?
