2
votes
3answers
92 views

Efficiently plotting a function with its translates?

How does one efficiently produce a plot of {f[x], f[x]+1}? Assume that f[x] is a long computation, which I would like to avoid ...
2
votes
1answer
144 views

Computing Poincaré symbolic solution for an arbitrary integer order polynomial

In the 1880s, Poincaré created functions which give the solution to the nth order polynomial equation in finite form. These functions turned out to be "natural" generalizations of the elliptic ...
0
votes
2answers
117 views

How do I define the following piecewise function?

For 0<=t<=10, if 5t<=n<=5t+2, then f[n]=4n, and if 5t+3<=n<=5t+4, then f[n]=4n+1? I would like then to use the specific values of f[n], for all n between 0 and 54 (t here is any ...
4
votes
4answers
183 views

Cases with Alternatives failed

Consider this list of rules rules = {a -> 1, b -> 2, c -> 3} I'd like to fish some of the rules out of such a list using ...
4
votes
0answers
68 views

Are there any rules about style inheritance in Mathematica?

I can style every part of an UI separately. But it is not handy and it would be nice to have list of Heads which are not inheriting at all or even partly. Are there any rules about inheritance? ...
7
votes
5answers
295 views

Counting subsequences (i.e., patterns) within a list?

I would like to count the number of subsequences in list. Say I have data given by: data = {1, 1, 1, 2, 1, 2, 2, 2, 1, 2, 1}; I would like to count the number ...
9
votes
2answers
342 views

Using up-values and down-values

I have a problem I'm trying hard to find a solution for, although I don't know if a solution exists. The following rules produce the result e[2].f[] ...
1
vote
0answers
81 views

Equation solving: Solve returns a periodic solution

I have a very simple trigonometric equation, that I've been trying to solve for a variable for a few hours now: (I couldn't find how to correctly format this) ...
4
votes
1answer
134 views

How to justify this Grid vertically

As titled above, How I can justify and how I can change the space between columns in this Grid specified below: ...
6
votes
2answers
185 views

How to write 1.0 in InputFields with ContinuousAction and Number constraint

With the concept of user responsiveness in mind, I’ve tinkered a couple of small apps that are supposed to be eh… responsive, i.e. calculating without having to press enter. They all rely on ...
0
votes
1answer
111 views

Custom distribution [closed]

I am trying to define a custom distribution using the code below. Unfortunately, it did not produce a satisfactory result ...
2
votes
0answers
25 views

Determining default value from previous arguments [duplicate]

How does one specify a default value for an argument which is dependent on the previous arguments of a function? For instance, consider the function ...
2
votes
1answer
104 views

Methods for producting alternating TickLabels in a Plot?

I am producing a plot with alternating TickLabels. Here is a MWE: ...
1
vote
1answer
40 views

Evaluation order in polynomials

I'm confused by the evaluation order of polynomials containing division. Consider these two polynomials: (x^2 + y) z/w (1) a/b (2) And their tree ...
9
votes
1answer
207 views

Front End options

Inspired by a recent question and others like it, and not finding an existing duplicate, I ask: What is the hierarchy of Front End options? How do they work? How can their values be set and ...
1
vote
2answers
99 views

Theory => practice: constructing a function “functionally”

I've read the Mathematica documentation and am certain there's way to do this with functional programming, but can't quite conceive yet how. I've taken a simple example (stating the series for ...
4
votes
0answers
109 views

How to efficiently read data from any part inside huge file [duplicate]

I have a data file (over 2.5 GB) and I want to do calculations on the data. At first I used. data=ReadList["file", Record,n] I still have three problems: 1- ...
0
votes
0answers
33 views

How to set the resolution permanently? [duplicate]

I'm new to Mathematica, each time I start Mathematica, I have to enter SetOptions[$FrontEndSession, FontProperties -> {"ScreenResolution" -> Automatic}] to ...
5
votes
1answer
476 views

Why Mathematica chooses bracket for function arguments over parenthesis?

This is a non-technical question. I'm just curious that why Mathematica breaks the convention that parenthesis are widely used for function arguments. What's the advantage for ...
0
votes
0answers
180 views

Solving a system of equations involving partial derivatives for a wave

Before saying anything about the problem, I have checked "How to solve a system of partial differential equations?" yet it does not actually answers my question, as I have a 10x10 matrix to work on. ...
2
votes
1answer
125 views

Limits and transformation rules

I can calculate this limit: Limit[(c^(1 - g) - 1)/(1 - g), g -> 1] and obtain the correct value: Log[c] but if I try ...
0
votes
2answers
96 views

Solving recursion equation with two parameters

I am trying to solve the following recursion equation, a(l,m)=l*a(l,m-1)+a(l-1,m) with initial condition; a(l,m)==0 if l=0 , a(l,m)==1 if m=1 I am trying to solve it ...
3
votes
3answers
140 views

Difference in rendering speed between slider and step forward in Manipulate

Consider the following Manipulate: Manipulate[Plot3D[Sin[x] Cos[y], {x, 1, 5 a}, {y, 1, 5 a}], {a, 1, 5}] When trying to step forward clicking the line of the ...
0
votes
1answer
63 views

Simplifying an answer returned by DSolveValue

Consider the IVP: $$x'=\frac92-\frac{x}{300+2t},\quad x(0)=0$$ Working the solution by hand, the answer is: $$x(t)=450+3t-\frac{4500\sqrt3}{\sqrt{300+2t}}$$ Entering code and then attempting to ...
6
votes
2answers
241 views

How can I output the coordinates of a city in coordinates of the Mercator projection?

On Mathematica version 8, I would like to use CountryData and CityData to mark Paris on a polygon map of France in the Mercator ...
3
votes
3answers
299 views

fastest way to perform the following summation

I have a vector $A$ with components $A_{i}$, and two matrices $X$ and $Y$ with components $X_{ij}$, and $Y_{ij}$ respectively. What is the fastest way of performing the following summation ...
1
vote
1answer
56 views

Function does not initialise variable as changes are made in the manipulate function

My function "DefineRss[]" takes in three arguments and outputs a plane value. It sits in the first argument of the function plot3D and that in turn sits in the manipulate function The function also ...
2
votes
3answers
101 views

Mathematica Contour Plot Problem [duplicate]

When I type ContourPlot[x == Sin[6*Pi*y], {x, -1, 1}, {y, -2, 2}] I get this Now I'm not a particularly gifted mathematician, but I have a feeling this just ...
0
votes
1answer
178 views
1
vote
1answer
113 views

Mathematica error in vector element access

I have the following code, but Mathematica insists that xj is not a symbol! How may I fix that? ...
1
vote
1answer
113 views

Minimize under constraint on an interval

I want find the minima of a (multivariable) function under a constraint which has to be fulfilled on a whole interval, let's say $$ \nabla f (\underline x) = 0 \ \\ \ c(\underline x,s)\geq0\ \forall ...
5
votes
3answers
1k views

Get Eigensystem to return orthogonal eigenvectors for Hermitian matrix

I have a Hermitian matrix, and I would like to get a list of orthogonal eigenvectors and corresponding eigenvalues. But when there are degenerate eigenvalues, sometimes Eigensystem/Eigenvectors ...
0
votes
0answers
45 views

Tensor sum contraction [duplicate]

Table[Sum[ KroneckerDelta[[i, j]] LeviCivitaTensor[3][[i, j, k]], {i, 1, 3}, {j, 1, 3}], {k, 1}] Why this doesn't work? how i do to make that sum?
1
vote
0answers
115 views

Restoring an out of focus image [duplicate]

Folks, I am studying ways to deblurring an image: Sample: , an my goal is the money in that hand. Is possible improve the image, features, etc..? I tried all the de blurring methods: 1 - first I ...
1
vote
0answers
35 views

MatrixConditionNumber for 2-norm unexpected error [duplicate]

From documentation it has been specified that we can use 1,2 or as the second parameter of ...
0
votes
2answers
426 views

Plotting energy dispersion on a hexagonal Brillouin zone

I'm trying to plot the energy dispersion of a graphene similar material. I've used the Tight Binding Function Approximation considering first neighbours and no overlaping. I have this 2 expressions of ...
3
votes
1answer
83 views

Why doesn't my expression evaluate at the subkernel?

Consider this code: ...
7
votes
1answer
136 views

Eliminating NDSolve Instability

...
1
vote
1answer
122 views

Mathematica script file in Linux - how to export PDF file and close kernel?

tmp.m file: tmp = Table[RandomReal[], {3}, {4}] Export["test.xlsx", tmp] Quit[] Then ...
5
votes
5answers
363 views

Plot all curves in a table with a single color

I want all of my solutions in a table to be the same color. My attempt: ...
0
votes
1answer
104 views

Why does this work with Wolfram|Alpha but not Mathematica? [closed]

I ran into this while doing some work today: It's the exact same syntax - and I expected that Mathematica would be more likely to be able to solve it, since oftentimes Wolfram|Alpha doesn't have ...
3
votes
1answer
521 views

PlotLegends is obsolete in v10?

I am using Mathematica 10.0.2.0 on a Mac OS X (Yosemite v. 10.10.1, 64bit). After I call: Needs["PlotLegends`"] I get the info: General::obspkg: PlotLegends` ...
11
votes
1answer
191 views

How can the Theil-Sen estimator be made to work on larger datasets?

The Theil-Sen estimator finds the slope and intercept of a line passing through a set of points by calculating the median slope and median intercept of the set of lines passing through all possible ...
4
votes
1answer
94 views

Is there a way to constrain the memory used for a notebook (session)?

I know that we can constrain the memory usage of certain computation using MemoryConstrained. Is there a way to constrain the memory of each cell evaluation during ...
3
votes
2answers
62 views

Evaluation control with TagSet

Suppose I have a property associated with two functions using TagSet: ...
15
votes
1answer
312 views

Header and footer banners in Slide Show style

I would like to create Mathematica slide shows that contain several tailored, fixed banners as headers and footers, much as MS Powerpoint, MS Word, Apple Pages, and LaTeX documents allow one to ...
0
votes
1answer
89 views

FactorialPower and Factorial

After some computation, I have obtained a function FactorialPower[1, n, -1]. Clearly, FactorialPower[1, n, -1] equals ...
33
votes
3answers
1k views

Mathematica and POV-Ray workflow (Q&A)

A couple of years ago, Alexey Popkov asked this question: Which ray tracing software is compatible with Graphics3D? It is my opinion, for various reasons, that out of the many ray tracing programs ...
0
votes
0answers
126 views

ListDensityPlot seems to break down for large arrays

(Using Mathematica 10) When using ListDensityPlot to plot 40000 + data points, the produced plot seems to be blurred/incorrect for points occurring later in the list. For instance, in the following ...

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