0
votes
0answers
10 views

Integrate using \[Esc] int \[Esc]

I like writing integrals symbolically instead of using Integrate[]. I suddenly seem to not be able to do this and am confused. I type \[Esc] int \[Esc] then ...
1
vote
1answer
18 views

Read a compressed ascii data file?

I would like to write a filter for Import to handle data files that are generated by LabView in the LVM format. This should be straightforward, since the format is ...
0
votes
1answer
32 views

Block works when directly used but not when used in a function

I want to calculate a derivative such as: $\delta f=\sum_{i=A,B} \sum_{k=1,2,3} \frac{\partial f}{\partial a_k^i}$. Since $ a_k^i$ are assigned values other places in the code, I have used ...
1
vote
0answers
9 views

Exchange variable value between Mathematica and Autohotkey script

I have a script written with AutoHotkey and would like to send some data to and from Mathematica. For now I am using the CopyToClipboard[] function in Mathematica ...
0
votes
0answers
7 views

Why wrapping this ContourPlot inside a Manipulate changes its output into something unrecognizable?

I am a bit puzzled: I wrap the same exact ContoutPlot inside a Manipulate, and it looks all wrong (I don't know what it's drawing but it does not look like the zeros of my polynomial). What am I doing ...
-1
votes
0answers
9 views

Solving third order polynomial equation

I am trying to solve this equation: 1/ s^3 + 3s^2 + 4s + 1 But I am not able to solve it. A little help is appreciated. P.S: I am new to mathematica so I am facing difficulty in syntax. If you ...
4
votes
3answers
46 views

Adding annotations to plot with vertical leader line to the curve

I am working with some GPS data for a bike trip I am going on. All the routes are given so it's easy to simply follow the line on your GPS. I am looking for a way to visually summarize information ...
0
votes
0answers
31 views

No connection to WoframAlpha with v10.1

I have a problem with my connection to WolframAlpha with the new version 10.1. And I can't figure out what causes it, because it works with version 10.0. Also, I have a connection to the data ...
0
votes
0answers
10 views

How I can make the StreamPlot of this differential equation?

I need the StreamPlot of this differential equation but I don't know how. dp/dt=0.4p(1 - p/30), 0 <= t < 5 and 0.4p(1 - p/30) - 0.25p, t > 5
0
votes
0answers
39 views

Double scale for both x and y axis

I need my graphics to display double scales for both the x and the y axis. I have been trying to use the method explained by Mr. Wizard here: Two x-axis with different units connected by function ...
-1
votes
0answers
27 views

Using a For-loop to do numerical integration

I was wondering if anyone can help me with numerical integrating my function Hy[xd] over the interval from -2 to 2. In the For-loop ...
2
votes
3answers
36 views

find position of nearest nonzero element in an array (functionally)

Given an array sel and an index position i0, how can I find the position of the nearest (left or right) nonzero element? I'm ...
0
votes
0answers
10 views

FourierSinCoefficients extremely slow

I'm just playing with Fourier decomposition of periodic functions. We had a similar example with standing waves and cosines in class, so I tried to expand a triangle wave in sines. This is what I came ...
7
votes
2answers
113 views

How to have one or multiple Boxed graphics, mixed with non Boxed, in the same Graphics3D

In the following example, I would like to Boxed only the RegionPlot3D, and not the Sphere. ...
2
votes
4answers
131 views

How to make multiple if statements?

I know Mathematica's if format is If[test, then result, else alternative] For example, this ...
2
votes
0answers
53 views

Memory leak when looping over FindInstance in version 10.0.0

When I run the following (simplified) code with FindInstance, my MemoryInUse is constantly increasing: ...
6
votes
0answers
46 views

Plot axes are not exported to SVG properly in Mathematica 10.1

In the past, I was able to export Mathematica plots as SVG files with relative ease. However, when I tried to do this recently, I found that the text in the plot axes was rendered completely ...
4
votes
0answers
49 views

Contour Integration along a contour containing two branch points

I need to compute following contour integrations: $$f(u)=\oint_\alpha dz \sqrt{z^3+z+u} \qquad ; \qquad g(u)=\oint_\beta dz \sqrt{z^3+z+u}$$ In which $\alpha$ and $\beta$ are two contours in ...
2
votes
0answers
24 views

What is the difference between GenerateDocument and TemplateApply[NotebookTemplate[

Abstract GenerateDocument[ _NotebookObject ] seems to do the same what TemplateApply[ NotebookTemplate @ _NotebookObject ] ...
1
vote
2answers
108 views

How can I create function which contains an ODE system and its numeric solution?

I have created a function like the following, which contains an ODE system. And I want to know the effect of different parameters. ...
5
votes
2answers
88 views

Kernel quits without error in NDSolveValue

I am using the latest 10.1. The following single line command makes the kernel quit without error message (just a beep): ...
1
vote
0answers
5 views

ParallelSubmit and WaitNext: check if a job is done before calling WaitNext

Say I process something with ParallelSubmit: LaunchKernels[] job = ParallelSubmit[1 + 2] Parallel`Developer`QueueRun[] Then, I will use ...
1
vote
2answers
87 views

Collect distributed sums

I have another task that somehow should be trivial. Suppose I have the following expression $$ \sum_{i=1}^n \frac{2}{9} x_i + 2 \sum_{i=1}^n \frac{1}{9} x_i, $$ or in Mathematica-FullForm ...
0
votes
1answer
19 views

aborting at a message, but still save data

This may be an easy question, but I can't find it anywhere. I have a code which solves linear equations in a do loop (possibly compiled) using LinearSolve. To save the results I use Reap and Sow. It ...
0
votes
0answers
73 views

Solving coupled differential equations with an eigenvalue

I have 2 coupled differential equations with an eigenvalue Ei and want to solve them ...
1
vote
0answers
17 views

Combined ListPlot3D using arrays of different length

I have three parts of a ListPlot3D that I would like to combine. The problem is, the middle part has more points in one dimension than the other two, which means I can't combine them easily to plot ...
3
votes
2answers
434 views

BC for transport equation using NDSolve

First I can solve a transport equation with a source (Is it still called transport equation?) using DSolve. The form of the source serves only as an example. It can ...
0
votes
2answers
143 views

FindShortestTour to solve Traveling Salesman Problem

I'm trying to write my own code to find the shortest route but I'm lost on how or where to start. Does anyone have any idea how the FindShortestTour function works? What type of algorithm or structure ...
9
votes
1answer
291 views

solve ODE with divergencies

The solutions of the second order differential equation $$\frac{1}{\eta}\frac{d}{d\eta}\left(\eta \frac{df}{d\eta}\right)+\left(1-\frac{s^2}{\eta^2}\right)f-f^3=0$$ is shown in Fig. 5.2 below, for ...
4
votes
1answer
65 views

Faster trimming of leading/trailing zeroes in rectangular array

Given a (large) rectangular array, e.g. (small for example case): ...
0
votes
1answer
48 views

DiscretePlot - adjusting the scale on Y axis to log with prescribed spacing

I have this picture of a residual Plot I am trying to reproduce (Y axis scale should be the same as in my plot): The code I ...
0
votes
1answer
31 views

Imaginary terms in the derivative of Jacobi theta function (2) on the real line

I am trying to calculate/plot the derivative of the second Jacobi theta function $d\theta_2(0, e^{-\pi t} )/dt$. Calculating or plotting the function itself works fine: ...
2
votes
1answer
60 views

How to implement symbolic Ramanujan's summation in Mathematica?

How to implement Ramanujan's summation in symbolic form in Mathematica? For instance, I want as input the function $f(x)=x$, as output $-1/12$, as input $f(x)=1/x$, as output $\gamma$ (Euler's ...
3
votes
3answers
96 views

adjust the alignment of different legends

I used Show to combine a ListPlot and Plot, and each plot has its own legend. The code is as ...
15
votes
6answers
1k views

Will Version 9 functions all work in Version 10?

Having developed a substantial code base in Mathematica 9, leads me to ask these important questions prior to downloading and installing Mathematica 10. Will any Mathematica functions from the ...
1
vote
1answer
51 views

How would I go about simulating conditional random birth 100 times?

So I have the following scenario: Assume you have this organism that reproduces by itself. An organism either reproduces 0, 1, 2, or 3 organisms at a time. Assume they're asexual and reproduce only ...
1
vote
0answers
87 views

Using Periodogram 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 ask how to investigate the seasonality in data using Mathematica. Which tool would you use to study seasonality? I.e. ...
0
votes
1answer
47 views

problems with wstp32 (WSTP / mathlink)

I've been recompiling old mathlink programs in Visual Studio 2013. No major problems so far until I got to a program that is seemingly similar to the others but that fails dramatically in the linking ...
2
votes
3answers
50 views

Referring to the components of a vector within a sum

I feel like I'm missing something obvious here, but.... I'm playing around, trying to do the standard deviation for my stats homework (don't worry, I already worked out the answer by hand), and I ...
-2
votes
0answers
19 views

Proof left-continuous of fucntion [on hold]

Hello everybody I have really no idea how to solve this question:
-1
votes
1answer
32 views

Manipulate excel file and plot

I have a number of .csv files that have the following format: I want to do the following: ignore the last two rows sort all the remaining rows w.r.t the 2nd ...
1
vote
0answers
29 views

I can create an H2 database with the H2 Console, but I can't find the database with MMA

I can create an H2(Server) database using the tool that H2 provides, but although i can create a memory based H2 database with the Database Explorer, when I try to create a connection to the ...
0
votes
1answer
48 views

Transcendental Equation

After playing around with The Planck radiation law for the spectral energy density, (differentiation and setting equal to 0 to find the maximum wavelength"x") I'm stuck on how to deal with what I'm ...
0
votes
0answers
23 views

SocialMediaData related functions don't save authentication data

Is there any way to stop SocialMediaData and ServiceExecute from making me re-authenticate every time? For example, say I have ...
1
vote
0answers
37 views

How can I crawl the facebook social network?

Before the Wolfram+Facebook API is shut down I'd like to scrape the largest possible friend network I can, starting with a certain "UserId" and doing a breadth first search (going outward to as many ...
2
votes
1answer
60 views

Faster variant of Reduce for finding zeros of holomorphic functions in a region

I'm currently using Reduce to find zeros of a function in a region on a complex plane: ...
6
votes
2answers
148 views

Plotting separatrices for nonlinear system

Consider the system: \begin{align*} x'&=(1-x-y)x\\ y'&=(4-7x-3y)y \end{align*} The system has a saddle point at (1/4,3/4). How can I plot the separatrices on the phase portrait having domain ...

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