# All Questions

15 views

### Can you unpack a list of values into variables in a With expression?

For instance, if I am trying to draw a graph with 5 vertices labeled a through e, and I want to draw edges connecting a and b, a and c, a and d, a and e, b and c, b and d, and c and e, I would run the ...
16 views

### Replacing elements in lists of a nested list

I have the following nested list ...
17 views

### Create movies from data files

I've done some simulations of a trajectory of a particle and I have that trajectory saved in ".dat" files. Now I want to make an animation/movie and save it as GIF to include it on a presentation. I ...
36 views

### Solving Partial Differential Equations using NDSolve

I'm trying to solve the following partial differential equation: With the boundary conditions: I could use another way to resolve this, like the finite volume method, but after I solve the ...
30 views

53 views

### Solve returns empty list

I want to solve these equations but Mathematica gives no answer. ...
28 views

### VectorPlot3D in cylindrical coordinates

I am using VectorPlot3D to plot fluid flows (in the form of a velocity field), however, I go through quite an involved process to convert flows in Cylindrical ...
27 views

### How to Extract Continuous .png Graph by Constant Piecewise Velocity? [on hold]

Time-Potential Data where the where the absolute values of axis do not matter but the points have possibly an equidistant piecewise velocity when comparing to the thread because regular jumps in the ...
292 views

### how to get $n$ equidistributed points on the unit sphere

We can get $n$ equidistributed points in the unit circle using CirclePoints. But how do you get $n$ equidistributed points on the unit sphere(surface of a ball)? ...
45 views

### How can I draw ternary plot by these data?

I have these data and want to draw similar fifures in mathematica. any one can help me? ...
66 views

### Expanding a matrix in a set of matrices

Consider a vector $a=\{a1,a2,a3\}$. I computed $e^{i a\cdot \sigma}\qquad \sigma: {\rm Pauli\ matrices}$ and then applied the command ExpToTrig. Now I want to expand the above result in terms of ...
163 views

### Samuel inverse graphing calculator

Samuel Inverse Graphing Calculator (http://www.xamuel.com/inverse-graphing-calculator.php) is a amazing tool. Whichever be your language, you can transform a sentence in an equation. I hav try with Yo....
52 views

### Solving 2D Laplace equation for irregular boundaries

I want to solve Laplace equation in 2D with $x$ and $y$ coordinates with the boundary conditions $V(0,y)=-180$; $V(x,0)=50x-180$; $V(x,6)=50x-180$; $V(453.595-\sqrt{450.05^2 - (y - 3)^2},y)=0$ The ...
456 views

### How to create this spikey in Mathematica?

I came across this post while messying around the StackExchange mobile. I think this thing can be easily done by Mathematica as well but I'm not an expert in geometric field. Can anyone give some ...
137 views

### How to do this 3D grid drawing?

The idea is to make axes 3d, with a more subdued in black mesh, and shafts with their respective numbers with a maximum of 10 in each (black to print after the size of half a sheet craft, vine also ...
163 views

### Efficient way to compute a complement while respecting multiplicities

Suppose I have list2 which is a subset of list1. I want to get a res by deleting an element ...
57 views

I would like to pad a nested list like M = {{{a, b}, {c, d}}, {{e, f}, {g, h}}} with some constant "vector", e.g. {0, 0}. ...
77 views

### Double Sorting a Matrix

Say I have two matrices {{0, 1, 2, 2}, {2, 1, 0, 2}} and {{2, 1, 0, 2}, {2, 1, 2, 0}} I then sort by the first row ...
39 views

### How to plot data with different colors (or symbols) depending on a condition [duplicate]

Let's consider a simple example. I want to plot a function on [0;2], depending on a condition: if x<1, I want to plot ...
66 views

### Drawing a circle with radius = 40 miles around Bunnell, Florida

The following works: ...
48 views

### Putting plots and graphs on a word document [duplicate]

Is there a way to copy and paste or save an image of a graph into a word document?
31 views

### Mathematica treating a system of 1st order nonlinear ODEs as a system of DAEs

I'm trying to use NDSolve to solve a system of 1st order nonlinear ODEs. The system of equations is way too long to post here, but it is in the canonical form: $x_i'(t)=f_i(t,x)$. My problem is that ...
178 views

### Mathematica implementation of Zeilberger's algorithm (previously done in Maple)

I have this Mathematica code: ...
56 views

### How to make the variables in $init.m$ not impact the autocompletion

The autocompletion is very convient in Mathematica,but it will make one annoying sometimes when you have a ton variables.I give a scene I encounter.I usually make ...
98 views

### how to update elements in a matrix with position identified in a list

I am new to mathematica. Could you pls help me on how to write this: I have a $5\times 10$ matrix, for example, ap = ConstantArray[0.001, {5, 10}] I have the ...
54 views

### How to make the \$ModuleNumber dynamic in a string

This code can run normally ...
58 views

### Importing Data to interpolation

I have an external file in extension XLS with looks as follows: This file can be obtained by the link below: Velocidade Angular With certainty this file is generating a list inappropriate for the ...
35 views

### How to parallelize a sequential program?

I asked this question and I got good answers, but now when I try to make the computing in parallel with this command ...
47 views

### Differential algebra package in Mathematica

Is there any equivalent of Maple's differential algebra package in Mathematica? In particular, the Rosenfeld-Groebner algorithm has been implemented?
24 views

### Differentiation and series expansion of dot product - inconsistent results

If I differentiate a dot product, I get the result I expect D[a.b[x], x] (* a.b'[x] *) However, a series expansion of the same expression gives a very different ...
122 views

### How do we draw some auxiliary lines for typical values of the function in a 2D Plot?

I want to draw some auxiliary lines for typical values of the function in my graph like these blue dashed lines: Also, I want to put the values of the lines by the lines like above one. Do you know ...
15 views

### polarized hodge structure [on hold]

With the notations in the picture blew, we define the classifying space D for the polarized hodge structures is the set of all collections of subspaces of H, how to deduce the conjugation relation?
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A fairly simple experiment, I am trasponsing an identitiy (3x3) matrix, and I got a weird result. I tried also CUDADot and works as expected. The code I used: ...
90 views

### Automatically add debug contents to a program

Sometimes I'll use Print[1] or Print[n] to debug in a long loop, but it's really a boring job to add these sentence by sentence ...
63 views

### How can I find the Quandl codes for metals?

Probably not the right site to ask this, but how can I find out the Quandl codes for different commodities? For example, gold against USD? Tried "CURRFX/XAUUSD", ...
86 views

I cannot find the original post now, but I'm quite sure that there's an amazing post teaching us how to do Thread on ragged lists. but my problem is how to inverse ...