-2
votes
1answer
50 views

Solving fifth order polynomial equation [on hold]

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 would be appreciated. P.S: I am new to Mathematica and I ...
0
votes
1answer
38 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
24 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 ...
6
votes
2answers
121 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 ...
-3
votes
0answers
74 views

Using a For-loop to do numerical integration [on hold]

I was wondering if anyone can help to find the numerical integrating for the following function with respect to xd along the line x [-2,2] with incriment 1/100. $Failed
1
vote
0answers
22 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 ...
1
vote
1answer
52 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 ...
2
votes
1answer
66 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 ...
2
votes
0answers
18 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 ...
0
votes
0answers
59 views

Double scale for both x and y axis [on hold]

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 ...
2
votes
3answers
66 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 ...
2
votes
1answer
51 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 ...
0
votes
1answer
29 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
54 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 ...
5
votes
0answers
88 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 ...
1
vote
1answer
42 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: ...
0
votes
1answer
52 views
2
votes
1answer
68 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 ...
1
vote
2answers
132 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. ...
2
votes
4answers
167 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
19 views

Proof left-continuous of fucntion [closed]

Hello everybody I have really no idea how to solve this question:
1
vote
1answer
62 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
votes
1answer
45 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
49 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 ...
0
votes
0answers
24 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 ...
0
votes
1answer
59 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
60 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 ...
1
vote
0answers
68 views

Real part of a sum

I would like to take the real part of the following expression: Sum[(a[i] + I b[i]) r^i/(r^2 + z^2)^i, {i, 0, 2 n}] where all of ...
0
votes
0answers
25 views

If statement with multiple expressions to be evaluated [closed]

Below is the code that I would like, but I am unsure of how to get it. I'm trying to run multiple expressions within the if statement and don't know how. ...
6
votes
1answer
74 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 ...
1
vote
0answers
34 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 ...
-1
votes
0answers
21 views

How to export 3D graphics to any 3D model format while preserving texture?

This question was asked previously but never answered. In recent posts people are finally talking about povray again, so I thought I'd repost but generalize the question to any 3D modeling format?
2
votes
2answers
41 views

How to combine Toggler and Button?

The Play function defines a toggle button to start and stop: I'm trying to emulate that, but with a single button. I feel like this is a common enough task that this question should be answered ...
1
vote
1answer
128 views

Getting coordinates of a embedded graph [closed]

I have to show how spring embedding works by displaying step-by-step images of a GridGraph[10x10] being embedded from a initial circular form to the final form, which should look somewhat like this: ...
3
votes
1answer
45 views

How to force Mathematica to interpret a file as HTML?

Some web pages do not explicitly contain the file extension "html" but is formatted that way (like this one). If I saved this page to my computer then Mathematica could parse it correctly. But if I ...
1
vote
2answers
73 views

Controlling colors of points in ListPlot

I have a collection of points I want to plot using ListPlot[]. I would like each individual point to be a certain color depending on a key value that is based on a list separate from the points. As a ...
4
votes
1answer
65 views

Problems with TimelinePlot

I'm trying to play with the example in this recent blog post, but I'm having a few basic issues with TimelinePlot: Labels are getting cut off: How can I get ...
0
votes
0answers
22 views

LieART package Sp branching rules [closed]

I have been trying to find several branching rules using LieART for Mathematica, more specifically from Cn to An. I have not been able to do so, with Mathematica telling me that either An is not a ...
1
vote
1answer
53 views

How to scrape image search engines?

I'd like to download highest resolution images possible from the search results like these: ...
3
votes
0answers
33 views

Is there a way to create named ranges for spreadsheet exports?

I am trying to figure out whether I can tell Mathematica to name ranges for data that I am exporting? I want to use this data in CPLEX, which unfortunately doesn't allow the use of the R1C1 notation, ...
3
votes
0answers
59 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: ...
2
votes
0answers
29 views

How do I numerically integrate over a data set that has uncertainties? [closed]

I have a 1D data set {xi, yi} with no uncertainties in xi and with uncertainties dyi in yi. The resulting discrete function is monotonic and relatively smooth and I would like to integrate the ...
1
vote
2answers
74 views

Manipulate with multiple locators [closed]

How can I work with tables/lists of Locators under manipulate? Note this is very similar to this question: http://mathematica.stackexchange.com/a/51956/2079 The ...
2
votes
1answer
61 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: ...
0
votes
0answers
28 views

How to append when function outputs are two different arrays?

I have written the following lines of code to generate two vectors $y$ and $poa$. I would like to repeatedly run different instances of the procedure, appending all the resulting $y$s to form one long ...
9
votes
2answers
164 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. ...
0
votes
0answers
25 views

Static Forces With Calculations of Diagrams [closed]

How can I calculate the reactions and draw Shear force, axial force and bending momentum diagrams..?
8
votes
4answers
121 views

ImageApply Performance Difference

How come the timing difference between these calls is so big? (0.2 and 39 seconds on my computer) ImageApply[q3, img] ImageApply[q3[#] &, img] Where ...
0
votes
1answer
44 views

Why does a transform from polar coordinates using `TransformedField` not agree with by-hand calculation?

I have the following (simple) system of ODE's that I wish to express in Cartesian coordinates: \begin{align*} r' &= r(1-r)\\ \theta' &= 1 \end{align*} Working it out by hand, by ...

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