All Questions

1answer
59 views

Change Alphabetical Order of TraditionalForm

I'd like to give my students a little visualization of the fact: $$x^n-a^n=(x-a)(x^{n-1}+x^{n-2}a+\cdots+x a^{n-2}+a^{n-1})$$ So, I've tried: ...
2answers
40 views

Two questions (Modifying Ticks and VectorGraphics)

Say x0[u_, v_, a_, b_, c_] := a* Cos[u]*Sin[v] y0[u_, v_, a_, b_, c_] := b* Sin[u]*Sin[v] z0[u_, v_, a_, b_, c_] := c*Cos[v] I take a parametric plot by ...
1answer
42 views

How to convert nested lists into “standard” lists? [closed]

What is the easiest way to convert a nested list in a "standard" list? For istance how can I fastly convert {{16.5807}, {17.1458}, {16.1343}} into ...
0answers
30 views

Reduce size of exported contourplot [duplicate]

Following the answer given here, I am plotting contour lines in black/white: ...
3answers
139 views

Chopping matrix elements, real or imaginary

An undesired shape of a matrix has the following form: which is created by ...
1answer
131 views

“Interface” for exam

Is it possible to create a (graphical) interface with Mathematica so that instead of having a Mathematica document where I change definitions and so on, I can just input values and it will use my code ...
0answers
35 views

How to transfer the list of parameters values into With [duplicate]

In the following case: With[{x=1,y=2},Print[x+y]] the values of x and y are declared in ...
3answers
99 views

SameTest using in summation over a list

I have a list ...
0answers
79 views

How to evaluate this integral

I am trying to evaluate the following integral in Mathematica: ...
1answer
208 views

geodesics' on torus

Is it possible to draw geodesics between the points in a path on a torus - toroidal surface? geodesics: generalization of the notion of a "straight line" to "curved spaces" ...
1answer
78 views

Mathematica's Solve[] and LinearSolve[] doesn't work to solve a system of equations IF parameters are not replaced

(I'm working on Mathematica 10.3) I have a system of 81 algebraic linear equations with 81 variables (variables are a1 to a81). ...
1answer
208 views

Trouble with shooting method for a 4th-order differential equation

I'm trying to solve the following forth-order ODE with the shooting method: \frac{1}{5}(y-2xy^\prime)=\frac{1}{x}\left\{\frac{xy^\prime}{y}+xy^3 \left[\frac{(xy^\prime)^\prime}{x} \right]^\prime \...
2answers
150 views

How to select 3-tuples of positions from a list with variable time-steps?

Below is a natural log list of ordered time data with variable time-steps. I would like a functional approach that selects 3-tuples of positions sublists based on the first selected elements that ...
0answers
69 views

ParallelTable pending the MathKernel after execution

I have done a ParallelTable computation in script mode. After execution, the output is fine and I've got all the data I needed. but the kernel seems pending, ...
2answers
195 views

Plot Command With Clean Grid Lines

I am trying to emulate this plot using Mathematica. Using the following command, I cannot get the grid points correct. ...
1answer
203 views

How to enforce a symmetric solution with FEM?

I'm solving the laplace equation in a domain with holes, and I need to compute the integral of the gradient on the boundary of these holes. For that I define a mesh and solve the laplace equation ...
0answers
34 views

How to calculate a required definition only once for each iteration of NonlinearModelFit

This is my first post here. I've been using Mathematica for about 4 years now to analyze data, but am still very new and have no background in formal programming. This is the first question I couldn't ...
1answer
227 views

Speed up construction of a dense matrix

I wish to find the numerical eigenvalues of a relatively small (100 dimensional) Hermitian matrix. While the eigenvalue calculation itself is fast, the construction of the matrix is taking longer than ...
0answers
134 views

Call Magma in Mathematica

I've written some code in Mathematica, related to some group theory questions I have. Subsequently, I found that part of the code could be significantly sped up if I could just call a routine in ...
0answers
39 views

Issues with overloading Order [duplicate]

I am pretty new to Mathematica(about 90 minutes) and I have encountered a problem. I have searched the web pretty comprehensively and came up with nothing. For a computing problem that I am solving, ...
4answers
750 views

Faces and NetFaces relation in polyhedron

I'm trying to generate some plots of polyhedra with coloured faces. To determine the colours, I require the adjacency information of the faces. For the 3D plot this works really well. Say I want to ...
1answer
327 views

Asynchronous Programming

Consider that you would like to listen for Raw WiFi Packets coming into your NIC. Since Mathematica doesn't have built-in functions for such low level programming (as far as I know), one alternative ...
1answer
57 views

Same integral gives different results with assumption

b = 1 k = 12560 r = 500 res = Integrate[Exp[I*k*x*Sin[o]]/(r + x*Sin[o]), {x, -b/2, b/2}] resab = Abs[res]^2 Plot[resab, {o, -Pi/20, Pi/20}, PlotRange -> Full] ...
1answer
51 views

How to indent/align Header 4

What's the deal with Header 4 (⌘ + 4 on OS X)? Are there options to align under or to the right of Header 3? Also remove the overbar? Couldn't find anything in Options Inspector.
1answer
87 views

Plotting with units — getting the right axes labels

I have a simple example: Plot[UnitConvert[Quantity[x, "DegreesCelsius"], "DegreesFahrenheit"], {x, -25, 300}, AxesLabel -> Automatic] The x-axis has the ...
2answers
45 views

Ticks and range in PairedBarChart

I am trying to change the ticks and range in a PairedBarChartbecause one of the ranges is much smaller than the other. How can I do this? ...
4answers
268 views

How to make FlattenAt work with Span?

This works: MapAt[h, {a, {b, c}, {d, e}, {f}}, 2 ;; 3] (* {a, h[{b, c}], h[{d, e}], {f}} *) but this doesn't: ...
3answers
54 views

Specify number of elements instead of step in Table [duplicate]

I think I have seen what I was looking for a ong time ago but I can't see nothing such in documentation. Quite often, I would like to create a Table with given ...
2answers
135 views

Discritizing an analytical 3D-function

I have the following Problem: I need a discretized amount of points in a 3D-volume. These points satisfy a condition to built-up a 3D-geometry. In my example below I selected a helical geometry. The ...
1answer
184 views

$x^6-2\varphi^5x^5+2\varphi x+\varphi^6=0$ solving in radicals

How to solve the equation $x^6-2\varphi^5x^5+2\varphi x+\varphi^6=0$ in radicals using Mathematica? where $\varphi$ is the golden ratio. Solution is Ramanujan's Class Invariant $G_{125}$, Class ...
0answers
34 views

Replace variable with other variable containing a constant in differential expression [duplicate]

I have the following differential expression: ...
2answers
80 views

Problems with formatting PlotLegends text [closed]

To avoid issues, I post here the photo to explain you better what my problem is. So what I would like to have, is a "correct" writings of the legend text for the Blue function. I would like it to ...
2answers
57 views

Shortcut Ctrl+Shift+8

What does the shortcut Ctrl+Shift+8 does in Mathematica (version 10)? On Windows 8.1 it displays a little square: I can write in it, but I don't understand what it does.
1answer
35 views

Expanding/printing function with constrained arguments [duplicate]

Let's say you have a function $f(t) = t, \text{ for } t > 0,$ declared in Mathematica as f[t_?(# > 0 &)] := t; How do you print that function? I ...
1answer
182 views

What kind of Arnoldi method is used in Mathematica?

Can someone give me a bit more information about what mathematical method Mathematica is using, (preconditioner, filtering-restarting, deflation) in the Lanczos implementation when I input something ...
1answer
107 views

Same name for functions in package and Global context

I am using a package that was written for Mathematica 3 while I am now working on Mathematica 8. I have issues with 2 functions in particular, Order and GraphComplement. They are a part of this ...
1answer
100 views

How to write this code as a pure function? [duplicate]

The code has three places with same variable ls. So I think it would be possible to write it as a pure function. ...
2answers
569 views

Is it possible to Parallelize Select?

Given a large list of elements, is it possible to improve Select by parallelizing? An example: from a 10,000,000-element list of integers between 1 and 10, select ...
2answers
78 views

Append fixed value to random selection of list

(This question might be an application of this other question, but there might be another solution specific to this application that I'm not aware of.) I am currently in a situation in which (in a <...
0answers
53 views

Custom keyboard shortcut. Previous answer is not working in Mathematica 10

I want to remap the alias delimiter from Esc to Ctrl+f (or Ctrl+Shift+f or some other key combo). I have not been able to get the previous solution to the question to work ( Rebinding keys to define ...
0answers
95 views

Is it possible to prohibit unnecessary CopyTensor in Compile? Just like .noalias() in Eigen library?

Turn on Needs["CompiledFunctionTools"] First example ...
1answer
128 views

Why does Table behave differently in Mathematica compared to WolframCloud?

In Stephen Wolfram's elementary introduction to the wolfram language it says you can use the table function like this: Table[5, 10], to create a table of the ...
1answer
68 views

What does the syntax <<X>> mean? [duplicate]

What does the syntax; << X >> mean? Where X is a number? Cheers
8answers
842 views

Best way to emulate MATLAB's bsxfun using Map and similar functions

Given a matrix, we want to subtract the mean of each column, from all entries in that column. So given this matrix: ...
0answers
38 views

Inspecting the evaluation stack on computation abort [duplicate]

It happens often that a computation starts consuming more memory or time when it encounters an expression with elements in the input that are in some unexpected form. Is there some way to abort ...
1answer
39 views

Using copy as I get an error [duplicate]

When I try to copy a plot file as a LaTex file I get the following error, TeXForm of GraphicsBox[<<1>>,AspectRatio->NCache[1/GoldenRatio,0.6180339887498948],Axes->{True,True},AxesLabel->{...
3answers
125 views

Symbolic differentiation [closed]

I have two symbolic differential equations and I want to used them in another equation as follows: ...
6answers
144 views

Color points in list plot based on whether they satisfy an equation

I wanted to create a set of points (a,b) such that a, b are both integers between -6 and 6. Then I want to color all points (a,b) that satisfy $|a-b|\ge2$ red, and all the remaining points blue. I ...
1answer
75 views

how to import plain text file, with mixed formats with strings that contain commas [closed]

I have been struggling with this basic task, and I am surprised it is this hard to do in Mathematica. I get lost in the maze of Import and options and sub-options and after trying many things, still ...
4answers
159 views

Add to matrix missing elements (for list of time series)

This question is an extension of the 43122. I’ve looked through many interesting post (like this) but (as always) missed the direct matching. So the setting is simple: ...

15 30 50 per page