-1
votes
0answers
28 views

Need help with GRE study question [on hold]

I encountered a question while preparing for GRE and am stuck. In an examination paper of 5 Questions, 5 percent of the candidates answered all of them and 5 percent none. Of the rest, 25 percent ...
0
votes
1answer
35 views

Equation of a transformed ellipsoid

How do I use RotationTransform to transform the ellipse with respect to the y-axis? The origin of the ellipse has to be at a length of ...
1
vote
2answers
32 views

Matching a case when one element in a pair is Null

I've got a dataset of laitutdes and longitudes. Unfortunately, some of the dataset was from when a time when lat/longs weren't constantly recorded. So I need to remove the invalid data before working ...
0
votes
2answers
33 views

Where to download “ToMatLab” package? [duplicate]

I want to solve some equations in Matlab which i generated with my code in Mathemetica. I want to convert these simple equations to matlab code and try to solve them. I am trying to download ...
0
votes
2answers
25 views

Restrict plot of object to be below a given plane in a ContourPlot3D

In a ContourPlot3D, I only want to part of the plot. Such as the part of a cylinder that lies beneath a plane. ...
2
votes
0answers
26 views

ParametricPlot MeshStyle bug in v10?

The documentation gives the following code and says "Use a red mesh in the x direction and a blue mesh in the y direction:" ...
1
vote
1answer
23 views

Problem with Neumann condition in quarter disc

So I'm following the available examples in version 10 for FEM, The plane stress operator is shown as this ...
0
votes
0answers
29 views

Calculating Value-At-Risk (VaR) in Mathematica. A simple code [on hold]

Calculating Value-At-Risk in Mathematica Obtaining data (Microsoft. Daily returns 2014): msftreturn = FinancialData["MSFT", "Return", "2014"][[All, 2]]; Code: ...
0
votes
1answer
43 views

Functions in functions

I have three functions f(x,y) , g(t) , and h(t) and somehow I have to find (d/dt)f(g(t),h(t)) where t = 0. How would I go about writing this in Mathematica? In this equation g(t) is taking place of x ...
2
votes
2answers
96 views

Solving 4 variable system of equations

Trying to solve a systems of equations. Here's the code: ...
2
votes
1answer
40 views

Problem with Style in a Plot

I would like to simply plot a density function $f_1$ and I would like to put a legend but I cannot do it as I wish. The problem is simple but I spent alot of time and couldnt solve it. I will be happy ...
0
votes
1answer
32 views

Automatically to add some points for a plot

Say I want to plot this Plot[x,Sin[x],{x,0,4 Pi}] And I want it to show 4 nicely spaced points, on the line. Is there an automatic way to do this? I was reading ...
0
votes
1answer
29 views

Struggling with FindFit

I'm trying to fit a sinusoidal wave to some numerical data. I can do it by hand using manipulate, so I know roughly the sort of parameter values that I should get back, but functions such as FindFit ...
-1
votes
0answers
34 views

Taylor Polynomials and Approximations in Mathematica [on hold]

I have to solve number 112 parts a, b, and c and number 113 parts a and b using Mathematica. I am very new to Mathematica so any and all help would be greatly appreciated. Click the link below to view ...
2
votes
0answers
16 views

To UpSet or not to UpSet when using MakeBoxes

What is the difference between the following two: ...
2
votes
1answer
27 views

Truncating power series

I have the following typed up so as to truncate higher powers of $\tau$, ...
0
votes
0answers
17 views

Define a Recurrence Table involving other tables

I'm relatively new to using Mathematica. Previously I used Matlab, but lately I noticed that the numbers i got in both of them do not match (mostly it seems that Matlab lacks precision...). The ...
0
votes
0answers
31 views

Turning a 2D 3 body problem into 3D not so easy?

I have programmed a 3 body problem, that can in theory work for more than 3 bodies. I apologize in advance for the length of the code that I posted, I don't really know how much one would need to ...
5
votes
2answers
72 views

ListPlot inserts extra PlotMarkers and Mesh at crossing points

In the example below, ListPlot with PlotMarkers -> Automatic and a variant using ...
7
votes
0answers
53 views

Is there a way to stop Export if the file size is too big?

I've got code that's exporting a file, but the file might be so big that it will take up too much space on the cluster I'm using and crash other users' processes. Is there anything like ...
2
votes
1answer
42 views

Identically styled cells from ToBoxes and Cell do not align

I'm trying to generate some worksheets using NotebookWrite so that I can control the page breaks, but have got stuck on the alignment as there appears to be a ...
7
votes
1answer
204 views

How do I generate cross sections of a 3D graphic?

I would like to approximate the volume of a bottle by summing up the volume of the individual disks. I have obtained code references from a demonstration. But how do I generate the cross sections? The ...
2
votes
1answer
71 views

Mean curvature of Sphere

I am trying to calculate mean curvature of a parametric surface(like sphere), and I wrote this code based on this discussion. Here is my code: ...
3
votes
2answers
169 views

Plane Geometry Diagrams With Labels

I can make some basic diagrams in Mathematica (stolen from their pages, for example see the below: LaminaData["FilledIsoscelesTriangle", "Diagram"] However, I'm ...
1
vote
1answer
46 views

How to calculate minimum positive solution of a equation?

Equations with triangular function usually have multiple solutions, like Solve[Sin[x] == 1/10, x] returns a solution like ...
1
vote
1answer
62 views

Problem using Compiled Function within NProbability

I've built a very simple function to estimate the probability for a Long Straddle (derivative strategy) to be positive at expiration. ...
0
votes
0answers
38 views

How to make an effective use of Mathematica to evaluate integrals, series, recognize closed forms, and do other manipulations [on hold]

I would like to know if there are resources to learn how to use the functions of Mathematica in the most effective way in order to evaluate difficult integrals and series or find possible closed forms ...
0
votes
1answer
38 views

How can I stop the integration of NDSolve with a condition?

I try to solve a partial differential equation by NDSolve. At some point, I want to stop the integrating by a condition that compares the min value of the function ...
5
votes
2answers
104 views

Apply Trig Identity to Transform Sum of Sinusoids into Phase-Shifted Cosine Function

I'm trying to solve for the output of a simple RC low-pass filter, with Cos[w t] input. The convolution of the input with the RC transfer function gives me the right output, but I'd like to be able to ...
2
votes
0answers
76 views

What is the algorithm behind Mathematicas Reduce in this equation?

Mathematica can use Reduce to arrive at an answer in this equation ...
0
votes
2answers
86 views

Unable to DSolve[{x''[t] + x[t]^3 == 0}, x, t] with IVs

I tried to solve for an non-Hookean spring's motion, but the output from Mathematica is weird. It seems that there is inverse functions involved. ...
6
votes
2answers
67 views

Mathematical operation on two lists by a “key” [duplicate]

I'm a complete newb here. Just looking for direction. I've got two lists like this... ...
0
votes
0answers
16 views

Size and Power of Test: Poisson Distribution [migrated]

In a homework problem, I am given a Poisson distribution with lambda = 1 as null hypothesis, lambda greater than or equal to 2 as an alternate hypothesis, and 3 as a test statistic. I am instructed to ...
2
votes
1answer
60 views

Image background subtraction using parallel computing

I am developing a program for pattern recognition. I want to use the parallel computing to get a real time application. I have two cameras where each one gives n frames/second. I need to process the ...
1
vote
1answer
64 views

Derivative of an expression containing a symbolic sum [duplicate]

Is there a general pattern for working with symbolic sums in Mathematica? For example here's a derivative I want to compute: ...
5
votes
2answers
144 views

Plotting two recursive functions

I'm trying to plot two recursive functions (p and θ) on a map. So far I have: ...
1
vote
1answer
42 views

Rationalize complex numbers

What is the best way to rationalize complex numbers, if not both the real and imaginary part are actually rational? According to the documentation, Rationalize ...
2
votes
1answer
131 views

Plotting on the Raspberry Pi

I just now powered on my new Raspberry Pi for the first time and tried the supplied Mathematica (Wolfram Language). One thing I tried was Plot[x, {x, 0, 1}] ...
4
votes
1answer
47 views

How to use Tandem Queueing Network Process?

Mathematica provides QueueingNetworkProcess and QueueingProcess. However, I can't seem to figure out how to create a tandem ...
0
votes
1answer
43 views

How to tell Eigensystem the type of the elements comprising a matrix I would like to diagonalize

How can I tell Eigensystem that a matrix $M$, which I would like to diagonalize, is a numerical matrix of complex numbers? My idea is that this information could ...
2
votes
0answers
50 views

Unexpected behavior from Indexed

I was going to include Indexed in this answer, thinking that it operated much as a List-only ...
0
votes
0answers
27 views

a complicated Sum [migrated]

I don't know how i can calculate this complicated multivariate sum : $$ S(l,k)=\sum_{|m|=k} s_{l,m}=\sum_{|m|=k} l(l-1)(l-2)\dots(l-m+1) $$ Where $m=(m_1,\dots,m_n)$, $l=(l_1,\dots,l_n)$, and $k$ a ...
-5
votes
0answers
49 views

Solve Linear Programm [on hold]

I got the following LP problem and have to solve it. Obviously, the y in the objective function needs to be replaced by constraint 2. These are the current values for H,L,f. Any ideas, how I can ...
2
votes
2answers
113 views

DSolve returning { } when given my ODE

Why does this code return {}? ...
1
vote
1answer
51 views

Summing subsets of array

I have an array farr, size Nx*Nx. I have a function frk that maps index {n,m} to an integer (approximately ...
0
votes
1answer
35 views

Loops for Unit Root Test

I want to compute some unit root tests on a data generating process. I already split the sample in 100 single samples, but how can I do a unit root test on all of them and store the results in another ...
2
votes
3answers
118 views

Extracting coefficients from a power series

I have a function defined explicitly as a power series: $$\sum_{n=0}^\infty{T_n}\frac{x^n}{n!}=\frac{\frac{x^3}{3!}}{e^x-1-x-\frac{x^2}{2!}}$$ and I would like to extract the coefficients $T_k$ as ...
3
votes
1answer
60 views

Draw function with different colors associated to a parameter

I want to generate a plot similar to this one, which allows for different colors when given different parameters : (This is the Moreau-Yosida regularization of the absolute value) the Moreau-Yosida ...
0
votes
1answer
33 views

Verticepair - route matrix

I have the following problem. I have two lists: list1 defines all possible commodities in a network g. E.g. Form vertex 1 to ...

15 30 50 per page