# All Questions

24 views

### How to make legends in Graphics?

To make an equilateral hexagon, here is my code in mathematica: ...
22 views

### Writing cells from other notebooks into current notebook?

I have a large number of Mathematica notebooks which contain study notes for different topics (as opposed to actual Mathematica Code). I'm trying to develop some code to randomly pull parts of the ...
18 views

### NotebookWrite in EvaluationBox forces Input CellStyle

There is a promissing new function EvaluationBox[] and a nice last example in documentation section for it: ...
16 views

### How would I set the equation number for an EquationNumbered cell?

Regardless of how many EquationNumbered cells are above or below, every new EquationNumbered cell that I add in my notebook shows (1) as the equation number. Is there a way to correct the equation ...
38 views

### How can I simplify a triple integral with exponentials?

I want to simplify the following triple integral with exponential terms. \int_0^\infty\int_0^\infty \int_0^\infty \frac{1}{R\,G} e^{-p(1+R\,a)-q\, b \frac{1+R\, a}{1+G\, x}}\, ...
23 views

### speeding up creation of SparseArray

I have to create the following sparse arrays, which are reshaped in a two dimensional matrix, so that i can use the build in Dot[] function to do a kind of ...
142 views

### Opposite of StringSplit

What is an appropriate command that does the opposite of the following. StringSplit["a b c d e f g"," "]
91 views

### Mathematica 10.1 availability [on hold]

According to this post and this page of the Wolfram Documentation Center a new Mathematica version is on the way, if not already available to some user. It'll be v. 10.1 and, as such, a rather major ...
21 views

### DateObject from AbsoluteTime broken

In the middle of a session (10.0.2 / Win64 / 2.7Gb working set - peak was over 7Gb) the form/definition for DateObject from an integer has disappeared. ...
123 views

### Lagrange Multiplier

We are asked to maximize and minimize $f(x,y)=4xy$, given the constraint $4x^2+y^2=8$, using the Lagrange Multiplier method. First, I enter the functions f and g. ...
29 views

### How can I get “custom” controls to appear and behave like “default” controls in my Manipulate?

For various reasons I need to define some controls in my Manipulate with complex behaviors that are not (or at least I don't think can be) accomplished using the ...
18 views

### Boundary Value Problem Errror

I have a first order differential equation such as d/dt (u[x,t]) = - u[x,t]*u[x,t] and the boundary conditions are ...
12 views

### Speeding Up the Numerical Integration of a Product of Numerical Integrands with NIntegrate

I need to solve a set of coupled integral equations within a self-consistent cycle. The final result will be functions, say $A(x)$ and $B(x)$, which are related to each other by some integrals which ...
37 views

### How to enlarge the plot without the legend (or label)? [duplicate]

I have 3 plot with legend on top. However when I array them in one row, plot is small. Then I tried to enlarge the output graphics, every graphic cannot enlarge except the gap. How to solve this? This ...
52 views

### Integrated Solution Graphics

I want to draw this nonlinear differantial equation' graphic with other solving equation (in same graphic). ...
21 views

### Solving a PDE with a spatially piecewise-constant material parameter

I would like to solve equation for the 2D distribution of an electrical potential in the conductive medium: div(sigma*grad(f))==0 where f=f(x,y) is the electric ...
51 views

### Is there a way to create a two column page layout in a notebook? [duplicate]

I am working on a white-paper that requires a two column format. Is there an existing Stylesheet that can be used or a way to create a Stylesheet that supports this Mathematica?
81 views

### Well-defined symbolic integral leading to ConditionalExpression

I would like to determine a closed-form expression for the following symbolic integral  \int_{-1/2}^{1/2} \!\!\!\! \mathrm{d} x \int_{-1/2}^{1/2} \!\!\!\! \mathrm{d} y \, \frac{1 + b x + c y}{1 + e ...
66 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 ...
53 views

### DensityPlot and KroneckerDelta

I have the following DensityPlot: DensityPlot[Sin[x] Sin[y], {x, -Pi/4, Pi/4}, {y, -Pi/4, Pi/4}, ColorFunction -> "SunsetColors", PlotLegends -> Automatic] ...
49 views

### Comparing memory consumption of two pieces of code

I have implemented something I want to do in two different ways, because I'm not sure which of the two approaches give best speed/memory efficiency. Comparing the speed of the two approaches is ...
54 views

### Filtering the output from Table and export it into excel

I have the following functions ...
35 views

### Call functions from a notebook inside C#

Is there a way to use functions from a notebook in C# with NETLink ? I found only this: Evaluate Notebook from .Net, but it is not of much help. Any suggestions ?
23 views

### How can i specify a NotebookSelection by a given CellObject?

My Questing is very simple. If I have a CellObject e.g. CellObject[Text], I can move the selection to this ...
36 views

### Problem in deriving general equation [on hold]

I have a problem to derive a general equation in Mathematica. The code below supposedly computes the intersection area What modifications should I make to the code to derive the area in terms of ...
44 views

### DatePlus and DayPlus perform much worse than my user-defined-function

I was debugging a function speed, and discovered that the time bottleneck was in DatePlus. I tried to change to DayPlus and get ...
31 views

### Ordered associations

Mathematica 10 has introduced Associations, elsewhere known as hash tables or dictionaries. Is there Ordered equivalent like in Python, Java, .NET? The data structure should remember the order in ...
213 views

### How do I write a condition for Position that uses both the current and previous element?

For example, given {57, 3, 40, 94, 9, 84, 81, 93, 76, 5, 7, 76, 38, 9, 23, 95, 49, 0, 30, 3} I'd like to get all the indices at which the elements cross from ...
25 views

### ListLinePlot will not print all the coordinates. How can I overcome this? [on hold]

I have the following list: ...
30 views

### Defining the domain of positive real numbers

I am trying to solve an equation by assuming that all the variables are real and strictly positive. I can use the keyword Reals for the argument ...
317 views

### Turning a set of random walk data 45 degrees

I have a set of data that is just a "random" (generated by me, not by computer) sequence of length 2000 of 1's and (-1)'s. I used it to plot a 1-D random walk where +1 is step up, (-1) is step down, ...
36 views

### Plot 3D with conditions and variables dependent on each other

I m trying to do something like this: ...
35 views

### FindRoot, Loops and multivariate nonlinear system

I posted a question yesterday asking how I could get all the solutions to my system of 4 nonlinear equations with 4 unknowns. I gave up on this since it seems ...
47 views

### If the earth's rotational speed increased by 2% each day starting today…what would be the difference in age 20 years from now? [on hold]

If the new adjusted revolution of the earth still equaled one day and 365 days still equaled one year, how old would someone be 20 years from now (20 years based on the current rotation of the earth) ...
20 views

### How to debug an existing notebook in Workbench

I have an existing notebook that I want to debug in workbench. This notebook is a self contained program that does not use any .m files. From what I can tell from the Workbench documentation you ...
22 views

### How to identify primary keys in an existing database table

I would like to identify the primary keys in a DB table using DatabaseLink commands trying to exclude SQLExecute. It seems like SQLTableInformation or SQLColumnInformation may not show that ...
51 views

### Memory Problem with Modules and NDSolve

I'm using NDSolve inside a module, and I appear to have a memory leak. The relevant code is: ...
25 views

### about Updating Wagon's FindAllCrossings2D[] function [on hold]

I am working with the shortest version of FindCrossings2D, which was provided by Vitaliy Kaurov. Here is Vitaliy's function: ...
51 views

### Finding R^2 and R^3 of relations [on hold]

Let R be the relation on the set { 1 , 2 , 3 , 4 , 5 } containing the ordered pairs (1 , 1) , (1 , 2) , (1 , 3) , (2 , 3) , (2 , 4) , (3 , 1) , (3 , 4) , (3 , 5) , (4 , 2) , (4 , 5) , (5 , 1) , (5 , ...
30 views

### Parallel evaluation hangs before doing anything

[I use Mathematica 9.0.1.0 on OS X Yosemite 10.10.2.] I am experiencing difficulty with parallel evaluation that I am finding extremely perplexing to troubleshoot. I define the following function in ...
114 views

### Get Axes Range of Plot?

Say I have some plot plot = Plot[Sin[x], {x,0,10}] (*as an example*) Is there a way I can get the x and y axes min/max values from the "plot" variable? If I ...
88 views

### Simplified expression is different than original

I have a question regarding the Simplify command in mathematica. I am working with a 4 x 4 table called Eqs, filled with symbolic expressions. I then do ...
89 views

### Mathematica on Raspberry Pi

Can I develop BSD/MIT open-source library for Mathematica using free non-commercial version on Raspberry Pi? To state it differently: does the non-commercial limitation of Mathematica on RPi limit ...
44 views

### How to change line lengths in LineLegend

How can I shorten the lengths of the LineLegend[] lines in the following plot? Is there a way to control line spacing as well? ...
21 views

### FindMaximum slow for fixed parameters

I hope my problem can be solved by just showing you this tiny part of my code which does not run on its own. I have an optimization problem and want these functions to work on various data sets. ...
16 views

### SetterBar Display using MatrixForm

I have vAwGOptns = { {{0}, {0}}, {{1}, {0}}, {{0}, {1}}, {{1}, {1}} }; and would like to select ...
27 views

### How to investigate the seasonality of the data

After asking how to get rid of the seasonality of this set of data, I'd like to close the circle with a last question: How to detect seasonality in data using Mathematica? A generic answer (not ...
47 views

### Better layout for large a directed graph?

This shows a directed graph for an iterated n-bit pseudo-random function parameterized by s. ...