0
votes
0answers
6 views

Programming a recursive FFT with Mathematica

I'm trying to program a FFT using a recursive function in Mathematica, though my program is not getting me anywhere at the moment. Could you say what's wrong with it and what I can do to make it work? ...
0
votes
0answers
2 views

Plot sets in the complex plane

I just want to know if there's a way to plot sets in the complex plane. For example $$A=\{z\in \mathbb{C},z+e^{z}=0\},\\A=\{z\in \mathbb{C},\Re(z)+e^{z}\geq0\}.$$
16
votes
1answer
436 views

Mma 10: Half the parallel power (Macs)?

Here is a comparison of the parallel kernels launched under Mathematica under v9 and v10, on the same identical current 2014 R2-D2 Mac Pro ... [ Update: Valerio has commented that the same issue ...
7
votes
3answers
374 views

Parametric regions

I'm trying to plot $a x^2 + b x + c$ where $a, b, c$ (and $x$) take on a range of values. I tried ...
8
votes
1answer
106 views

Numerically solving Helmholtz equation in 2D for arbitrary shapes

I would like to solve the Helmholtz equation with dirichlet boundary conditions in 2 dimensions for an arbitrary shape. (for a qualitative comparison of the eigenstates to periodic orbits in the ...
4
votes
1answer
25 views

How can I export my learned ClassiferFunction[] and PredictorFunction[]s?

Mathematica 10 provides beautiful high-level machine learning functionality. Sadly, the learned functions once created are rather opaque objects. I need to use them in other projects, so here is my ...
1
vote
2answers
24 views

Manipulte is evaluated slowly

I have this function: f[k_, θ_, ϕ_] := Cos[k*Cos[θ]*x + k*Sin[θ]*y - ϕ] I want to change the parameters $\theta, \phi,$ and $k$ to see the effects on the ...
3
votes
2answers
18 views

Why does Rotate in PlotMarkers behave strangely?

While answering Change the inner color of markers I came across a behavior that may be a bug. I would like to know if there is another explanation. First a basic example of normal behavior: ...
0
votes
1answer
25 views

Compare elements in a list

Assume that there are three different points in x-y coordinate like below : p1={4, -1}; p2={5, -2}; p3={1, 5}; In order to compare these points two by two in a ...
1
vote
1answer
12 views

How to make PlotMarkers constructed from Graphics track plot style?

In this plot the Disk[] markers are not colored according to the style of the line to which they belong: ...
15
votes
1answer
336 views

What is wrong with triangle PlotMarkers in v.10.0.0?

In Mathematica 10.0.0 we have built-in graphical triangle PlotMarkers. Let us look closer on them: ...
-2
votes
0answers
13 views

Find yards with LWH

I have a box I need to cover all sides with a single layer fiberglass fabric. The dimensions are 34" long; 15" wide; 12" High. How do I determine how many yards I need to buy?
11
votes
3answers
449 views

Change the inner color of markers

I would like to have a marker with white as its inner color, to be able to make this kind of graph: If I use PlotMarkers -> Style["\[FilledSquare]", White], ...
1
vote
0answers
13 views

How to fit data with numerical solution of system of parametric ODE?

I need to find the parameters (k1,k2,k3,k4,k1r,k2r,k3r,k4r) that fit my data (list of [Intensity, time]) using the function ...
1
vote
2answers
25 views

How can I make DensityHistogram obey the lower bound in PlotRange in version 10?

In version 9, DensityHistogram worked with PlotRange as expected: ...
12
votes
1answer
198 views

ToNumberField won't recognize Root as an explicit algebraic number

In Mathematica 9.0.1, it appears that ToNumberField will not always recognize a Root object as an explicit algebraic number. ...
4
votes
2answers
78 views

Why does TraditionalForm[Inactivate[x y]] show x * y ? instead of x y?

Given that both x and y are expressions, in my case x is ...
1
vote
1answer
39 views

Is there a way to check inequalities in Mathematica given restrictions?

Sorry if I'm still a noob, but is there a way to check inequalities in mathematica given some restrictions? For example how could one go about checking whether: Given $a,b,c\in\mathbb{R}$ and ...
1
vote
1answer
58 views

references in a nested matrix

I have a nested matrix n: ...
1
vote
1answer
49 views

ListPlot with conditions

I have a data file containing the position of about $10^5$ stars of a spiral galaxy. Here is the plot and this is the corresponding code ...
4
votes
3answers
145 views

Find intersection points with V10

My question departs from this one: Find intersection of pairs of straight lines but now I want to find the points with the new V10 Region-functions. ...
3
votes
2answers
94 views

Fourier Analysis: How to get rid of a discontinuity

When I compute the phase error of a spatial series data using Fourier analysis in Mathematica there's a discontinuity @ parameter ...
4
votes
1answer
124 views

Apply function to every element of list regardless of depth

I want to apply a function to every element of a list without taking braces into account (depth level), but with the same form of output. Here is an example : ...
2
votes
0answers
49 views

magic rectangle with mma

I was trying to solve this puzzle using mma It looks like the generalization of the magic square. Anyway here my attempt:- There are four columns $(x,y,z,w)$ and nine rowa which are denoted by the ...
4
votes
1answer
144 views

How to generate nonperiodic tilings?

I need to generate nonperiodic tilings which are similar to the attached figure (kite-domino tiling). I was thinking the code is similar to the code for the Penrose tiling. However, that code is too ...
3
votes
1answer
94 views

Why is my compiled code slower?

I am trying to make a Mathematica program run faster. Here is part of the original version. It takes as input the integers X (of order 100), J (of order 10000), and n (of order 100), the real number p ...
0
votes
0answers
43 views

How to modify a Dataset? [duplicate]

How does one go about modifying parts of a Dataset? Could the answer please solve the following as an example. Start with the ...
1
vote
1answer
40 views

3D Contour Plot parts of sphere with gradient less than 0, equal to 0 and more than 0

I want to plot only parts of the sphere of radius 1 where the gradient $\frac{\partial z}{\partial x}$ is < 0, = 0 and > 0. The full sphere is given by: ...
3
votes
2answers
85 views

Probable Bug in HighlightMesh with 2D Convex Hulls created via ConvexHullMesh

One nice way to view the new and exciting Mesh objects introduced in Version 10 is by utilizing the function HighlightMesh, so ...
0
votes
1answer
24 views

Reducing Output length by introducing new variables

I have outputs like "expression/(1+3*c^2) +anotherexpression/(1+3*c^2)" and so on. Is there any way to set 1/(1+3*c^2)=A where A is a new variable so that the output reads like ...
-1
votes
1answer
45 views

How to get solution from DSolve

How to get the solution from DSolve in such way that there is no need to copy the result. When for example solving: ...
0
votes
0answers
32 views

How to solve 7 equations with different vars?

a = 0.35; b = 0.4; Delta = 0.1; Q1 = 0.65; Q2= 0.15; Phi= 0.5; Tau =0.28; Rho= 0.01; Mu= 3.7; R = 0.047; A= 0.4; B= 1.99; Sigma = 1.1; e1 := (1 - a) *p*A*K*L^(-a) = (1 - b) B(1-K)*(1 - ...
1
vote
0answers
33 views

specifying a list (vector) of arbitrary length

When trying to do symbolic calculations in mathematica involving a space of dimension n, which is arbitrary but fixed, I'd often like to work with vectors that have ...
0
votes
0answers
27 views

How can Mathematica solve 7 equations and want to find 7 variables [duplicate]

I have 7 equations as below * e1 := (1 - a) p Subscript[A, 0] Subscript[s, K ] ! *SubsuperscriptBox[(s), (L), (-a)] = (1 - b) Subscript[B, 0] (1 - Subscript[s, K]) (1 - Subscript[s, ...
5
votes
1answer
81 views

How to plot stability region of Fourier analysis

Stability limits for Runge–Kutta methods in the complex ΩΔt-plane are needed to be plotted like this: For example, let P=1+z where ...
1
vote
0answers
20 views

DatabaseLink Example for DB2 and Mathematica

could someone please point me to good example on how to make a JDBC connection to an IBM DB2 database?
0
votes
1answer
60 views

ParallelMap returns incorrect results over Map

I've written a function to pull in the useful column of a large data file: ...
0
votes
2answers
40 views

prime-palindromic number selected from a list

I want to find all prime-palindromic numbers up to 5000. Prime-palindromic numbers are numbers that themselves and their reverse digits are both primes. For example, 31 is a prime-palindromic number ...
4
votes
1answer
42 views

Operator syntax for Merge-like Query

Is it possible to take advantage of Dataset's Query operator syntax to Merge parallel queries thereby avoiding Function's that are otherwise required? Using the planets data: ...
5
votes
0answers
68 views

In version 10 EvaluationCompletionAction “ShowTiming” no longer gives useful output; any solutions?

In version 10 using this Front End option no longer gives useful output: SetOptions[$FrontEnd, EvaluationCompletionAction->"ShowTiming"] In version 7 the time ...
1
vote
2answers
83 views

An argument pattern that my function can treat as Times[constant, variable]

I want to define a function of two variables, func[f_, g_], such that when it sees a general constant multiplying one of the variables, say ...
0
votes
2answers
85 views

How can I graph an equation with five variables?

{c*((a - b*Cot θ)/(Subscript[r, 1])^4) + ((b*Csc θ)/(Subscript[r, 2])^4) This is a form of Poiseuille's Law I need to graph. I want the value of the variables to ...
3
votes
4answers
322 views

Why does Fourier give a shifted frequency?

I have a signal that I want to identify the frequencies in it, I used the Fourier function but I can't get the frequency correctly. Here is a simplified example: ...
0
votes
1answer
37 views

Why does Assuming[…] work in one case but not in another?

Why does this work Assuming[α > 0 && ϵ > 0 && t > 0, FullSimplify @ Integrate[(z^2 Exp[-α t (z^2 + ϵ)])/(z^2 + 1), {z, 0, ∞}]] ...
-1
votes
1answer
40 views

NDSolve solution methods issue

I´m modelling a biological reaction thorugh a set of differential equations. ...
12
votes
1answer
110 views

BitShiftRight produces incorrect results in Version 10

With Mathematica 10 for Mac, BitShiftRight works properly on lists of up to 100000 numbers, but appears to give incorrect results when threaded over lists of 100001 ...
20
votes
5answers
1k views

Will Mathematica install and run on Raspberry Pi computer?

My club is considering buying a Raspberry Pi computer for tinkering. Can Mathematica be installed on and ran from it?
7
votes
4answers
210 views

Plot the plane so different condition has a different color

I have a list of functions defined on the plane, and I want to know which one of those functions is smaller than the other functions at particular points. Currently, what I do is ...
0
votes
1answer
45 views

Choose location of axes using plot3D [on hold]

How can I choose where on the box my axes are plotted using plot3D? When one generates a plot and rotates it manually, the axes automatically change their location on the box. I am specifying the ...

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