12
votes
2answers
583 views

Why aren't parentheses ( ) an expression in Mathematica?

Why aren't parentheses ( ) an expression in Mathematica? Can I get an expression in a form where parentheses are represented by an expression?
1
vote
1answer
189 views

Factoring large integers with the Pollard p-1 method

I am trying to use the Pollard $p-1$ method to find the factors of a large integer. Here is the problem: An RSA-type cipher is based on the integer $n = 140016480344628383$ and exponent ...
3
votes
3answers
194 views

truncated square wave input

I'm investigating the response of some dynamic system on Mathematica and I want to generate a tailored square input like the one in the following picture: Does anyone know how to generate such input ...
0
votes
3answers
183 views

Revolution of two curves around the y-axis

I've looked through the other posts on rotating a function around the x or y axis and haven't had any luck. my question is this how do i rotate the area between the functions $f(x)=x^2+1$, and ...
0
votes
1answer
98 views

Having trouble interpreting the results DSolve gives for the Laguerre equation

I am trying to solve a second order ODE using Mathematica. Before I get into solving my (more complicated) problem, I am trying to use DSolve on known ODEs to check that the answer that Mathematica ...
0
votes
2answers
53 views

How do I use DictionaryLookup to exclude words with certain phrases?

I'm looking to use DictionaryLookup to search the English dictionary for words that don't contain certain strings. For example, I want to exclude ...
3
votes
1answer
65 views

Interactive graphics without creating a new cell

A simple graphics command creates a red circle and a blue square: Graphics[{Red, Disk[{0, 0}, 0.5], Blue, Rectangle[]}] I can "close this up" by double ...
1
vote
1answer
138 views

Slow program- Mathematica shuts down

I've been trying to draw dynamic pictures of level sets of certain polynomials. The code right now looks like that : ...
0
votes
1answer
53 views
25
votes
1answer
301 views

Does Mathematica store hidden information for matrix objects?

Bug introduced in 10.0 and fixed in 10.2.0 I found a case where calling one built-in function (HermitianMatrixQ) for a given matrix changes the behavior of ...
0
votes
0answers
42 views

ImageSize in Export [duplicate]

According to the documentation, Export["foo.eps", out, ImageSize->500] should produce a graphic that is 500 printer points wide. When I execute that command with ...
0
votes
1answer
88 views

Basic (?) dynamic module questions (If clause and refresh problems)

I'm building a dynamic module, but I'm stuck with a few things i don't know how to deal with. In particular I'm stuck with the "If" sentence and the refresh inside the dynamic module. Here's a ...
3
votes
0answers
89 views

How does Mathematica automatically choose which classifier method to use?

I'm interested in what heuristics are used in Classify's choice of method.
4
votes
1answer
112 views

Factoring out parts of an expression

I'm looking to factor out the parts of a multiplication type of expression. For example for the expression: $$20 e^{-t^2}\frac{t^2}{\sqrt{t^2+a}} erf(b+t)$$ I'd like to get a list in the form of: ...
0
votes
1answer
100 views

Plotting the image of a curve under a complex polynomial using Mathematica

I would be able to plot the image of a curve (say the circle with radius $1$ centered at $1+i$) under a complex polynomial (say $p(z)=z^2$) using Mathematica. I know how to find the level curves of ...
3
votes
1answer
132 views

Fundamental question about capabilities of Mathematica to represent abstract mathematics [closed]

I have an fundamental question about what Mathematica can and cannot do. I have a book which presents a certain physical theory in an axiomatic manner. The axioms make heavy use of mathematics. Some ...
-2
votes
3answers
71 views

Two unrelated questions: 1. Output of Series[] for function, 2. Output conditional answers as if not conditional [closed]

As mentioned in the title, I have two questions. 1. I have code that looks similar to: ...
3
votes
1answer
158 views

How to stop optimization (e.g. NMinimize) after reaching target value

Suppose we have some function f[x,y] that we want to optimize in way that we are only interested in values (x,y) that guarantee ...
2
votes
0answers
238 views

How do I flip x and y value of a list in mathematica? [closed]

I am very new to mathematica. I have been trying to the following without any success. I have a list like this : data = {{1,2},{3,4},{5,6}}. I want a list ...
0
votes
0answers
89 views

How to use a While loop with NDSolve?

So basically I have this coupled ODE system I'm trying to solve numerically: ...
2
votes
1answer
115 views

Plot a function with a discrete part

I would like to plot a function like this one: ...
1
vote
0answers
39 views

NDSolve with external function [closed]

I have a complicated function g[a_,s_,t_] where s_and t_ are constants added by hand for ...
3
votes
1answer
241 views

Setting up parallel remote kernels

I'm having trouble setting-up a parallel remote kernel. I have correctly set-up remote kernels and can use them instead of the local kernels, by executing tunnel.sh ...
0
votes
0answers
119 views

RegionPlot3D of MeshRegion with VertexColor-like behavior

I regularly use the VertexColors option with GraphicsComplex[] to render images of objects with certain attributes at the ...
3
votes
0answers
182 views

Calling CUDA cuFFT

Following ybeltukov's excellent answers (see here and here) about how to access the CUDA library functions and interact with Mathematica through CUDAMemory, I tried to compile the code given in ...
3
votes
3answers
274 views

NIntegrate-ing a compiled function

I'm trying to integrate numerically in 6 dimensions a very long expression and I read about the option to NIntegrate a compiled function which should be faster. ...
2
votes
4answers
113 views

how to cancel arbitrary term in fractional formula

I often encounter this kind of problem that I want the fractional formula to be looked like the way I want it to be. For example, this one $$\frac{R^2 \left(g m_1-g m_2\right)}{J+m_1 R^2+m_2 R^2}$$ ...
3
votes
2answers
98 views

4D array not exporting to .mat file

I am using Mma 9.0 I am trying to export an array with Dimensions {5,100,160,160} to a .mat-file using the Export command, but ...
1
vote
1answer
179 views

Import csv file which contains columns of different lengths --> How can I delete empty fields?

I have the following problem: I want to import a csv file into Mathematica. I file as a lot of rows and columns, but the column lengths differ for certain rows. 2 columns always belong together, ...
0
votes
1answer
74 views

Unevaluated form of an expresion [duplicate]

I have two matrices - s1 and s2. I want their sum to remain unevaluated. For instance, the command ...
17
votes
1answer
583 views

Quit the Kernel and start new session automatically

The question is how to quit the kernel, start a new session automatically, and to be able to run such procedure from e.g. Button. This is especially useful when ...
1
vote
1answer
103 views

Traffic growth forecast: showing the change of linear regression

The following picture shows a changement in the trend of data. (The data used are available here). Is there any tool that can show this change of trend? Until now I managed to show even more ...
5
votes
2answers
156 views

Combinatorics: Placed errors

Consider a vector of length n where each element can take one of the values U, X, ...
2
votes
1answer
121 views

Dealing with functional equations

I have the specific function $G$ of $x$ satisfying the functional equation $G^3x=-1+G(1-x)+G^2x$. By using Mathematica, I would like to simplify the following polynomial of $G$ and $x$. $2 G^2 + 6 ...
4
votes
1answer
344 views

TimeSeriesModelFit incorrect?

I am trying to determine the optimal model for time series data (1592 observations). When I run TimeSeriesModelFit, Mathematica selects $AR(1)$ model, the estimated ...
24
votes
0answers
346 views

Documentation of the frequently-used functions in the context of Internal` and Compile` [duplicate]

In this site, I have gradually found out that there is a collection of functions in all kinds of answers. For instance, Compile`GetElement, ...
0
votes
1answer
95 views

Recursion depth and solving equations using Solve

I am trying to solve an equation: ...
0
votes
1answer
121 views

Trapezoid approximation to definite integral

this question is related to Basic question on defining more rectangles. I now was trying to adapt the code by MarcoB to get the approxiamtion of the integral by trapezoids, and I used the function ...
5
votes
1answer
233 views

Aligning transformed images to form a mosaic

I'm trying to align and stitch together these images to form a mosaic: It's a similar problem as this one: How to keep the non-overlapping parts when aligning images? However, (and I may not ...
0
votes
1answer
89 views

How to summarize the coefficient in Notation?

With the help from Stephen Luttrell in stackexchange, I can give an intuitive expression of quantum walk, as shown in the Mathematica codes below. ...
6
votes
1answer
102 views

Why are SetProperty and PropertyValue not working here?

I have a very simple graph, a loop: ...
1
vote
0answers
62 views

Clicking on a point on a plot [duplicate]

I want to click on a plot and have the pointer snap to the actual curve displayed. I found ways to click any random point on the plot but I want it to only click on actual points on the curve. I want ...
1
vote
2answers
336 views

How to Fit experimental data with 4D ParametricNDSolve?

Let me first explain the background problem. I'm trying to solve a problem with a projectile motion in 4D such that the position vector is: $\boldsymbol{r}(t)=\boldsymbol{r}[x(t),y(t),z(t)]$ I have ...
5
votes
2answers
145 views

How to manipulate graphs without losing properties like EdgeWeight?

Let's say I have a weighted graph, ...
1
vote
1answer
90 views

writing data in defined format into file

I have a code that writes datas into file using PutAppend[]. A simple form of the code is written below, ...
3
votes
0answers
77 views

How can I programmatically ungroup cells [closed]

I have a series of ~500 notebook files (created by a colleague), which somehow have had their cell groups modified from the default (perhaps accidentally by said colleague). In order to extract the ...
25
votes
4answers
409 views

FullSimplify wrongly reduces expression to zero

Bug introduced in 9.0 and persisting through 10.4 I get the following output with a fresh Mathematica (ver 10.0.2.0 on Mac) session ...
1
vote
1answer
211 views

Solution of a system of differential equations with a correction factor varying over time

Dear Mathematica users, I am trying to solve a system of equations of first order and time depedent. The system has 5 equations, one for every variable which varies over time. At the moment I am ...
8
votes
3answers
469 views

How to remove all dead ends from a undirected graph?

so what I want to do is take an undirected graph, and remove all the "dead ends" (that is, vertices that are attached to only one other vertex), but do it in such a way that it does it until reaches ...
2
votes
1answer
69 views

Import EPS and use as symbol

Is it possible to import a vector file & use as a symbol / plotmarker? I tried importing an EPS from Illustrator & assigning a name to it, but it failed. I would really like to be able to use ...

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