6
votes
2answers
392 views

Don't understand why Mathematica is complaining about my Graph expression; how can I fix it?

The Tube in Arrow problem is fixed in version 10. Note that in version 10 Graph3D must be ...
2
votes
1answer
229 views

Fluid mechanics problem concerning flow over a wedge

Below is the code I am using to generate a velocity profile and temperature profile for flow over a wedge. ...
1
vote
1answer
61 views

How to select a set of cells to cut and paste into another notebook [closed]

I'd like to cut and paste from one Demonstration notebook to another. These notebooks have a few sections where the content is separated into disjoint cells (examples: Details, Related Links, Search ...
0
votes
1answer
136 views

Scaling the time axis of an interpolated function (as in a solution from NDSolve)

I'm wondering how I can change the units of the x (time) axis when plotting a solution from NDSolve. I have obtained three solutions to a system of differential equations, all of which exist over the ...
0
votes
2answers
70 views

How to obtain all the partitions in a set $A$ such that the union of these partitions equals $A$?

I'm trying to make a visual proof on the irrationality of $\sqrt{2}$. At the moment, I've created a figure to show that $b^2$ elements always constitute a square: And I want to show that it's not ...
0
votes
1answer
114 views

Bar Chart: How to adjust the font size for the bar labels as the chart size is manipulated

I have data that represents the binding energy of oxygen on different surfaces. Each bar is a different transition metal, and the length of the bar is the binding energy of oxygen. How do I make the ...
1
vote
2answers
97 views

Computing symbolic norm of a vector

Consider the code: n1 := Cos[α] Sin[β] n2 := Sin[α] Sin[β] n3 := Cos[β] n := {n1, n2, n3} Norm[n] Why the result is ...
0
votes
1answer
114 views

Advice on Gather

Is there a better way to write this gather? I have a list of particles, "particlelist", and a list of particle coordinates, "coordlist" and I want to put all the particles into a 3-dimensional ng x ...
2
votes
1answer
95 views

CDF embedded in web page and Windows desktop magnification

I am running Windows 8.1 on a ThinkPad T540P with a 3K screen, which is equivalent to Apple Retina screens. I have configured Windows to increase the magnification of the desktop to make fonts ...
0
votes
1answer
493 views

Union::normal: Nonatomic expression expected when using Uncompress

I saved a expresion to a file like this Export["file.dat",Compress@myExpression]; Then (i don't know why) when I import the file i get the compressed expresion ...
7
votes
3answers
660 views

How to fix this memory leak

I am using halirutan's code in this thread to unflatten a list. It works very well but the problem is that the Module's local function f is not deleted when the ...
4
votes
1answer
124 views

How to set the position of the palette when use CreatePalette[]

When using CreatePalette[], the palette created always shows up on the upper left corner. Is there a way to make it show up at the center of the screen, just like ...
0
votes
3answers
61 views

Printing the base 'b' value of an integer as a string (without the subscript base indication)

Is there a simple one-liner to convert a given base 10 integer to a string representation of this integer in some desired base 'b'? Is there a way to do this avoiding the subscript indicating the ...
0
votes
0answers
367 views

Caching RecursionLimit::reclim error

I am learning how to catch exceptions, RecursionLimit::reclim in particular. To see how it works, I came up with the following example: ...
4
votes
1answer
256 views

Creating a dynamic plot directly from the recurrence relation

I have the following recurrence relation that has no general solution: $$x(t+1) = \frac{x^2 + x(1-x)(1-sh)}{x^2 + 2x(1-x)(1-sh) + (1-x)^2(1-s)}$$ In Mathematica language it gives: ...
3
votes
1answer
207 views

Importing a Base64 encoded string

everyone, I'm handling some paragraphs enconded with Base64 from CSV file format. The problem is that Mathematica can't decode it. It seems Mathematica Encode/Decode their own Base64. I'm thinking ...
4
votes
3answers
601 views

Using If statements internal to Table [duplicate]

Is there a way to use If statements with Table? To give a kind of ridiculous example that captures to spirit of what I'm trying ...
1
vote
2answers
501 views

Research positions of lists of varying size

I'm new to the site and I am French, so I ask your indulgence for my future mistakes in English. I would like to optimise the following code : ...
0
votes
1answer
82 views

Why do Permute and PermutationReplace not invert one another? [closed]

Why do Permute and PermutationReplace not invert one another, as stated in the documentation? If we have an identity ...
5
votes
4answers
548 views

Distance between two line segments in 3-space

I need to compute the distance between two line segments in a project. After googling, I found this algorithm and used it to implement a Mathematica version: ...
-8
votes
1answer
492 views

Plot The Cornu Parametric Spiral

How to plot the Cornu parametric Spiral in 3D With Mathematica. The 2D is quite easy. Thx. For more details you need to be familiar with the Cornu statement. $$\begin{cases} ...
1
vote
1answer
271 views

How to reverse the direction of the y axes on Graphics

Question related to this one, except I need the same for the Graphics. Lets say I have the following drawings: ...
0
votes
1answer
58 views

Why won't Manipulate work with symbols generated by Symbol?

Suppose I am provided with two data lists. (Assume for the moment that they are lists of integers.) I would like a function that generates bar charts that I can manipulate. Here is what I have: ...
2
votes
0answers
68 views

Why does setting $Assumptions make my Fourier transforms slow?

Consider these Fourier transforms ...
0
votes
0answers
101 views

How do I find where the maximum is?

I have a function given by: ...
3
votes
3answers
213 views

Finding a better way to define a matrix

I first defined a 171x171 matrix containing only zeros and then replaced 18 specific rows with nonzero entries. The other $153$ rows will be average of $2$ of the existing $18$ rows. Rows $2$ ...
1
vote
2answers
310 views

Given an equation with one parameter, how do I use NSolve to solve it for many values of the parameter?

I was wondering if there was a way to use the Mathematica NSolve command to solve an equation that has a parameter with various values. An example of which is: ...
2
votes
1answer
138 views

Replacing powers of $n$-th partial sums in the output of a function with $S[i]$ for $i = 1,\ldots,n$

I've written some simple code that, for various $N \geq 1$ and $k = 1,\ldots,N+1$ computes the $n$-th derivative of $\log S_N$ where $S_N(z) = \sum_{k=0}^N \frac{1}{k!}z^k$ as follows: ...
1
vote
1answer
78 views

Efficient calculation of diagonal matrix elements

I have a matrix $V$ of size $M$ in which each row $i$ is a vector $v_i$. Now I have another matrix $H$ and I would like to calculate as efficiently as possible the list of values $v_i^\dagger\cdot ...
2
votes
1answer
130 views

Defining conditional Notation rules

I am trying to define a notation rule so that for selected symbols subsripts will be equivalent to function parameters. My understanding of the docs suggests the following ...
0
votes
1answer
96 views

Network graph with lights not working

So I have ...
7
votes
1answer
397 views

Fitting a numerical integral via NonLinearModelFit to magnetic data

I'm new to Mathematica and I'm currently trying to fit $$m_T (H,T) = N_T \int\limits_0^{\infty} \frac{x k_\text{B} T}{\mu_0 H} \mathcal{L}(x) \text{pdf}(D_\text{mag}) \text{d}D_\text{mag}$$ with ...
2
votes
1answer
154 views

How to handle a sparse array of lists

I have data in the form of a sparse array of lists. For example: ...
0
votes
1answer
37 views

Storing solution to x and y [duplicate]

If I do sol=Solve[{2x+2==y,3x+9==y},{x,y}] then Mathematica will tell me {{x -> -7, y -> -12}} But I would like to ...
1
vote
0answers
76 views

Finding undetermined coefficients with boundary conditions

I have 2 equations which are; To[x_] := c1 E^(-a1 x)/2 + c2 E^(a1 x)/2 + a2 Tu[x_] := c3 E^(-a3 x)/2 + c4 E^(a3 x)/2 Tu equals almost zero ...
2
votes
1answer
48 views

Problem with parentheses and ScriptBaselineShifts

Style[ DisplayForm@RowBox[{"(", SubsuperscriptBox[2, 6, 7], ")"}], 18, Bold, ScriptSizeMultipliers -> 1, ScriptBaselineShifts -> {1, 3}] or for ...
4
votes
1answer
224 views

Katz Centrality [closed]

I want to calculate the Katz Centrality of large graphs. The Mathematica command to do that is KatzCentrality[g, $\alpha$] and it is also fast. However I realized that there is a mismatch between ...
2
votes
2answers
221 views

How to solve this numerically?

May I ask what is the best way to evaluate ...
1
vote
1answer
107 views

How to operate with function body without evaluation

I have several functions (let a[x] and b[x]), defined as expressions with integrals and differentiations. I want to perform some ...
1
vote
0answers
51 views

How to find out how Mathematica performed an integration? [duplicate]

In terms of integration, I usually utilize Mathematica 9 to compute scattering amplitudes in quantum field theory. Recently, I employed it to compute a particularly difficult integral, and it ...
0
votes
1answer
560 views

Use de Casteljau algorithm to create Bezier Curve in Mathematica [closed]

Is anyone can tell me how to create Bezier Curve with given Bezier polygon and parameter t by using de Casteljau algorithm (not the Bezier function in Mathematica)in Mathematica code? Thanks a lot!
0
votes
1answer
120 views

Multiple Simulations of a Markov Chain

I am trying to create a simple series of Bernoulli bits whose probabilities follow a two-state Markov chain. ...
0
votes
1answer
76 views

Make several separate Manipulate controls on a single line?

How do I make several different Manipulate controls appear on a single line? I currently have both a Slider and an ...
1
vote
0answers
51 views

Inverse Z Transform returning complicated expression

I want to study how the Z transform changes with the sampling rate T, in a closed loop system. The command I'm using to do this is: ...
5
votes
3answers
760 views

Fast code to generate large random graph with fixed degree sequence

I'm trying to create a function so to generate large random graph with a fixed degree sequence $\{v_1,v_2,\dots,v_N\}$, where $N$ is the number of vertices in the graph. The Mathematica function that ...
0
votes
1answer
79 views

Running function - updating list - run function etc

I am making a larger program, so I would prefer to give a short example of my problem: ...
0
votes
1answer
159 views

Index of iteration inside NestList [duplicate]

I have a list of RandomReal: delta = RandomReal[{-0.01, 0.01}, 1000] I want to add each element of the list to the ...
4
votes
1answer
435 views

Why IntegerPart[x/(x/2)]=1?

Consider this code x = 0.109354682484; IntegerPart[x/(x/2)] (* 1 *) Precision[x] (* MachinePrecision *) Why does it give 1 ? Version number: 9.0 on Mac 10.9.2 ...
1
vote
1answer
67 views

Variable location for intial value in ParametericNDSolve

I am trying to figure out if Mathematica allows a variable location for a known initial value for ParametricNDSolve. I haven't been able to find an example where ...
2
votes
1answer
102 views

Determining sample size with no replacement for a given confidence and reliability when there are x failures observed during sampling?

I am trying to follow the procedure of a Sandia Labs report found here to determine the required sample size, for various population sizes, with no replacement for a given confidence and reliability. ...

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