3
votes
0answers
72 views

Powers of dimensionless quantities: is this a bug?

Today I came across the following behavior: Quantity[x, "Minutes"/"Minutes"]^-1 (* Quantity[1/x, (1/#1 &)[("Minutes")/("Minutes")]] *) It seems that ...
7
votes
0answers
96 views

Color Snapping When Using VertexColors with a Tube with BSplineCurve as an Argument

I think I've identified a bug in how VertexColors are treated when rendering a Tube object where the underlying data is a ...
2
votes
1answer
71 views

Generic templating system

I'm trying to implement a templating system in Mathematica, a bit like the List<List<T>> you would find in C#. Here's how it looks so far: ...
2
votes
0answers
78 views

Axes in a vector plot

Consider: ...
0
votes
4answers
129 views

Family of Lines

I need to draw a family of lines connecting (a,0) and (0,b), where a+b=2, and determine an equation for the envelope of this family of lines. I need to do this in mathematica and don't know where to ...
1
vote
2answers
71 views

Label of Ticks are overlaying

I have a little problem that's driving me crazy. The problem will be clear from the graphic: the text of the tick labels. on the Y-Axis are crossing/overlaying. I tried everything but I found nothing ...
0
votes
1answer
47 views

Using Check[] on multiple statements

I am using a loop to run run multiple fits. If a fit fails, I don't want it to either appear in my data or to affect later fits so I am using the Check[] function to catch if any errors occurred (I'm ...
6
votes
2answers
277 views

Extruding a wierd 2D shape to make a prismatic 3D shape

I have the outline of a 2D shape defined by a periodic radius R[θ]. I would like to extrude this linearly to a prismatic 3D object that has my cross-sectional ...
0
votes
1answer
80 views

How to draw a 3D Plot with non-numerical axes?

I've got a CSV file that looks like this: c1,c2,m1,m2,m3 'a','b',1,0.5,4 ... 'x','y',10,100,4.21 Where c1 & ...
3
votes
3answers
280 views

How to plot functions in multiple coordinate systems

I´m curious if is it possible to plot in: A. two different Cartesian coordinate system who share the same plane but have different origins and rotation. The visualization should preferably resemble ...
3
votes
2answers
352 views

How to force Return[] to return from an arbitrary point (like in C++)?

I need to test some complicated conditions to calculate a Return value. But MMa doesn't let you Return[] from anywhere the way C++ does. The structure of my Module is similar to this: ...
0
votes
1answer
262 views

Implementing the Golden Section Rule

I am attempting to write a code which brackets the minimum of a unimodal function, using the Golden Section Method Below. I am have serious issues debugging my program though, any help will be ...
1
vote
0answers
52 views

How can I rename the local kernel without causing issues?

I would like to name my kernels. However when I remove "Local" Mathematica becomes unstable, sometimes crashes sometimes doesn't initialize correctly. Is there something special about the name ...
1
vote
3answers
134 views

Expressing a series formula

I want to generate a series of the following kind in Mathematica: $\quad \quad a(n+1) = a(n) + ({\rm prime}(n+1) - 1)/2 \quad \mbox{for odd primes},$ so that the resultant series is ...
-1
votes
1answer
137 views

Trying to write my own Greedy/ Nearest Neighbor Algorithm

So I'm trying to write my own function and compare it to the results I have from using FindShortestTour. Does anyone know how to find the distance from each city to each of the others without ...
2
votes
1answer
49 views

Strange evaluating indication of output cells

Something like this happened when I was working with two Manipulate cells. I saved the notebook, duplicated it and only keep these two cells, and opened the ...
22
votes
1answer
410 views

Generating animations of clouds with Mathematica

I'd like to generate some visually-pleasing animations of clouds, fog or smoke with Mathematica. My idea of "visually-pleasing" is along the lines of one of the images on the Wikipedia article for ...
4
votes
0answers
57 views

Mathematica doesn't italicise a function's argument in the function's body if it appears in the denominator and the denominator is edited. A bug?

Bug introduced in 10.0.0 and persisting through 10.1.0 or later I'm using Mathematica 10.0.2 for Mac. On a fresh kernel, I type this: a is not italicised ...
3
votes
2answers
221 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
150 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 ...
-2
votes
1answer
105 views

Solving fifth order polynomial equation [closed]

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 ...
3
votes
1answer
250 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 = 0.4 p(1 - p/30), 0 <= t < 5 and 0.4 p (1 - p/30) - 0.25 p, t > 5
0
votes
0answers
47 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
193 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 ...
1
vote
0answers
67 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
155 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
83 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
51 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 ...
2
votes
3answers
150 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
91 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
45 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
93 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 ...
10
votes
1answer
278 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 ...
4
votes
2answers
133 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: ...
1
vote
1answer
343 views
11
votes
2answers
288 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
203 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
223 views

How to make multiple if statements?

I know Mathematica's if format is If[test, then result, else alternative] For example, this ...
1
vote
1answer
76 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
96 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 ...
3
votes
0answers
179 views

How can I scrape the social network for a subset of users in Twitter?

Clearly one cannot scrawl the entire network... but I'd like to extract a statistically representative sample from the network. More specifically, I'd like to access the graph induced by scraping the ...
1
vote
0answers
74 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
117 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
120 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
96 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 ...
8
votes
1answer
166 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
131 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 ...
2
votes
2answers
84 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
227 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: ...

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