2
votes
1answer
275 views

How can I download images from Instagram and Twitter?

The new function ServiceExecute seems to suggest the ability to download images containing a specific hashtags. Can anyone get this to work?
3
votes
1answer
111 views
0
votes
1answer
490 views

Export graphic as Pdf gives incorrect font size [duplicate]

In Mathematica 10.0.2 I have this plot: Now, when I export as pdf, I have these huge fonts. Any workaround?
14
votes
1answer
130 views

Unexpected pattern matching behaviour: PatternSequence vs. Optional

fixed in 10.1 (windows) Consider the following pattern-matching expressions: ...
0
votes
0answers
89 views

Numerical Integration/Function

I have a problem with a function defined numerically through an integral of the form: ...
2
votes
0answers
71 views

How to compute the longest non-contiguous common sequence?

LongestCommonSequence[] works well, but what about finding the longest common sub-sequence (not necessarily contiguous)? Is this function built in to the genome ...
9
votes
5answers
273 views
0
votes
0answers
130 views

Set first line in CSV as header in mathematica list

New to stackexchange. Need some help with mathematica - also new to this!. I have a CSV file with 80 something columns and 6000 something rows = 500,000ish elements in total. I am trying to import ...
1
vote
0answers
71 views

Version incompability Mathematica 10 CDF Player 9

I have aleady looked at these two questions: Is there a CDF Player for Mathematica 10? and Problem with NDSolve in Mathematica 9 / 10. My problem is as follows. I am simluating neurons, which ...
1
vote
1answer
162 views

Why does Mathematica add Hold to the result of my user defined symbol?

In the code below I have defined a symbol that multiplies two block-matrices (I can't use the builtin Dot since Dot assumes that the matrix coefficients commute): ...
3
votes
1answer
129 views

Bug in associated Legendre Polynomials?

Mathematica's definition of the connection of associated Legendre polynomials with $m$ and $-m$ is: $P_l^{-m}=(-1)^m \frac{(l-m)!}{(l+m)!} P_l^m$. We also now that $|m|>l \Rightarrow P_l^m=0$. ...
0
votes
0answers
33 views

SumConvergence with product $\sum_1^\infty{\frac{1\times3\times5\times…\times(2n-1)}{n!}}$

SumConvergence[( Product[(2 n - 1), {n, 1, infinity}])/n!, n] $$\sum_1^\infty{\frac{1\times3\times5\times...\times(2n-1)}{n!}}$$ However this returns true but it ...
4
votes
1answer
171 views

What is “MouseDragged”?

Maybe I'm picky but I don't consider static pressed button: "dragging". EventHandler[Framed[1], {"MouseDragged" :> (Print@RandomReal[])}] neither does ...
2
votes
2answers
62 views

Coloring specific elements of sets with a prime modified order in an array plot

I have a set of sets: {{1}, {0}, {1, 1}, {0}, {1, 0, 1}, {0}, {1, 1, 1, 1}, {0}, {1, 0, 0, 0, 1}} I’m seeking to apply a color rule to only every other set, starting from the first (from left to ...
6
votes
1answer
162 views

Long running ToElementMesh with very “large” domains

This is fixed in version 10.3. I'm trying to solve a system of PDE over a large domain. This doesn't means I need to have a huge amount of mesh points and mesh elements to discretize the domain. ...
0
votes
1answer
73 views

Correcting a gap in ListPlot

This is a small sample of my data ...
0
votes
0answers
43 views

Coloring all elements in prime ordered sets amongst a set of sets

So I have a set of sets. I want only those sets whose order amongst the sets plus one is prime to be colored (all the same, anything but the standard black). Any ideas? ArrayPlot[{{1}, {1, 1}, {1, 1, ...
7
votes
0answers
103 views

ListPlot3D. Only plots about half of the data in a 3D matrix

Here is the data and the exact command I'm trying to run. I've had success with other datasets generated and written out to a file by the exact same program in the exact same manner but for some ...
1
vote
0answers
190 views

Find the smallest eigenvalue (not absolute value ) for a generalized eigenvalue problem

Related post Find the eigenvector associated with the smallest eigenvalue, not smallest in magnitude I tried to find the smallest eigenvalue for a generalized eigenvalue problem A c= \lambda B c ...
4
votes
4answers
448 views

$L = \lim\limits_{z \to 1} \frac{1-z}{1-z^\ast}$ evaluates incorrectly

I'm about 90% certain this is a Mathematica issue, not me making a silly mistake. I'm trying to evaluate $$L = \lim_{z \to 1} \frac{1-z}{1-z^\ast}.$$ Naively entering ...
4
votes
1answer
92 views

Extraneous reaped data with NDSolve and WhenEvent

Bug introduced in 9.0 or earlier and fixed in 10.1 In exploring What is the range of values $x$ for which $f(x)$ is higher than $k$ over a given domain?, I came across the following strange ...
0
votes
1answer
76 views

The 1st approximation of multi-viables which contains the differential [closed]

When I input to Mathematica as following, ...
1
vote
1answer
127 views

Defining Solutions to FindRoot a functions of parameters-Part II

Here's a similar question as the the preceding question with the same title, but this time with vectors, which I need to use. I followed the suggestion in the answer the the previous question, but it ...
0
votes
1answer
80 views

Weird behavior when solving a simple physics problem

I have the following code in Mathematica that represents two balls being thrown, one with a velocity v10 (6 in this case) and another ball thrown with a velocity v20 (its just dropped) one second ...
6
votes
6answers
888 views

Can't comment strings with '*)' inside it

I believe it's a bug in notebook's comment parser. I can't comment strings with *) inside it. Something like: ...
1
vote
1answer
220 views

Defining solutions to FindRoot as a function of parameters in Mathematica

This works: f[a_] := x /. FindRoot[x^2 - a == 0, {x, 1}] f[3] (* 1.73205 *) I need this to work, but it doesn't: ...
0
votes
1answer
57 views

Assuming: what am I doing wrong? [duplicate]

Why doesn't this simple line work? Assuming[Element[#, Reals] & /@ {x}, Reduce[x^4 == 1]] (* x==-1||x==-I||x==I||x==1 *) I'm trying to do something a little ...
2
votes
2answers
140 views

KeyMap on a flat Dataset (i.e. Dataset@Association)

How can I go from Dataset[<|"A" -> 1, "B" -> 2, "C" -> 3|>] to ...
1
vote
0answers
93 views

Problem with ParallelTable?

I am trying to numerically solve Bloch equations using Euler's method. My code is the following ...
3
votes
1answer
41 views

Is it possible to generate a message when precision upgrade occur?

I use Mathematica mostly for numerical simulation, so most of the time double precision (or machine precision) is enough for me. Mathematica has this nice feature of automatically upgrade to arbitrary ...
3
votes
6answers
157 views

What is the range of values $x$ for which $f(x)$ is higher than $k$ over a given domain?

What is the easiest way to answer the following question in Mathematica: Given a function $f(x)=y$, what is the range of values $x$ for which $y$ is higher than some number $k$ over the domain of $x$ ...
0
votes
0answers
216 views

Writing rules for Einstein summation

I'm trying to write a list of rules for tensor manipulations and in particular, Einstein summation convention. What I've tried, so far is to write something that would take a generic functions with ...
0
votes
0answers
32 views

ErrorBarFunction styles [duplicate]

I am having trouble making sense of the help I have found for the ErrorBarFunction command. I am looking for basic instructions on how to change the width, style, and color of my error bars. ...
7
votes
2answers
124 views

Why does ToRules return a Sequence?

Why does ToRules return a Sequence expression? Why doesn't it return directly what ...
1
vote
0answers
55 views

Confusing NullSpace Method behaviour

The background of this question is that I'm trying to get the bottom of when the output of NullSpace outputs a list of pairwise orthogonal vectors. On my route to ...
1
vote
1answer
106 views

Why `FindMaximum` doesn't work in my example

Consider the following function ...
2
votes
3answers
250 views

Custom Grid Lines for ProbabilityScalePlot

I'm plotting up some data using a ProbabilityScalePlot in Mathematica 8. It currently looks like so: Code: ...
0
votes
1answer
68 views

Why does `Table` returns values but `Plot` doesn't plot them?

The Table function works fine and return a nice list of values ...
0
votes
2answers
92 views

How to exract the roots from “Roots”? [duplicate]

Given how the output looks like, as in a set of "==" assignments, is it possible to extract specific roots from the output of, http://reference.wolfram.com/language/ref/Roots.html ? And then do a ...
0
votes
1answer
699 views

How do I write nested for-loops?

Looking through the reference.wolfram, I couldn't see an example of how to write a multiple line "for" loop in Mathematica. I need to nest many for-loops in such a way I can do many things in the ...
30
votes
3answers
1k views

Can Mathematica solve Plateau's problem (finding a minimal surface with specified boundary)?

Given a closed curve $\mathcal C$ in three dimensions, is it possible to use Mathematica's built-in functionality to compute a minimal surface whose boundary is $\mathcal C$? For simplicity, let us ...
0
votes
1answer
76 views
1
vote
0answers
68 views

Why do I get this error (solving a system of equations)? [closed]

I use the following code ...
1
vote
0answers
84 views

Multi-named Vertices (or Overlapping Vertices) in TreePlot/LayeredGraphPlot, or Merging Trees

If there is a series of rules from which a TreePlot/LayeredGraphPlot is made: ...
1
vote
1answer
86 views

Simultaneous use of Set AND SetDelayed

Tha Mathematica documentation gives a good example of the simultaneous use of Set and SetDelayed in dynamic programming for the Fibonacci sequence under "neat examples" for SetDelayed ...
1
vote
1answer
86 views

pure functions in nested select

I want to select certain rows from a list by using two nested Select commands ...
2
votes
1answer
73 views

Are there methods to serialize and deserialize large calculation runs? [closed]

I have a fairly large calculation to map an electric field over large areas (square kilometers). This runs for a fairly long time. Are there ways to serialize the current state of a running ...
2
votes
1answer
248 views

Drawing all lines between a set of points

Given that I have the array of points, ...
1
vote
1answer
146 views

Initial Value Problem with initial conditions as closed region

Does Mathematica have functionality to solve an Initial Value Problem when the initial conditions consist of a closed region (rectangle) instead of a point? That is, instead of initial conditions as ...
1
vote
1answer
164 views

Exporting A4 size

I have a few tables and graphs that I want to export to a PDF file using Export[....,"PDF"], but I would like to be able to print this PDF-file and still be able to read it. So how can I control the ...

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