13
votes
1answer
261 views

How to determine numeric equivalent of Tiny, Small, etc. image sizes for Graphics?

Is there a way to find the numeric equivalents of Tiny, Small, Medium, and ...
1
vote
1answer
176 views

Blank VectorPlot

I'm trying to draw a VectorPlot of a function that admittedly probably is not very well suited for such a plot. But at the moment I just get a white sheet and I ...
2
votes
1answer
191 views

Dynamic [ NotebookEvaluate [“_”] ]

A nice way to centralize various tasks in one notebook is the NotebookEvaluation function. For instance I can evaluate ten notebooks from a single notebook (e.g. ...
2
votes
1answer
59 views

Panel help with little program

I'd like to show the output of this program into one large Panel, but when I surround this code with Panel[ ], it doesn't seem ...
6
votes
1answer
137 views

Creating a Block from a list of rules

How can I create a function which works like Block but takes a list of rules as its first argument, rather than a list of assignments? The function needs to be ...
4
votes
3answers
316 views

Input field that appends to a list

I'd like to make a dynamic, changeable list, which has elements that are supplied by the user in an InputField. I want the program to have an InputField and a "reset" button. Every time the user ...
12
votes
2answers
402 views

Implementing an algorithm for finding the largest circle that contains a single point in a set (and no other point)

This question concerns the implementation of an algorithm proposed by Rahul Narain on a former question of mine that was migrated to math.stackexchange: ...
5
votes
1answer
1k views

Solving a system of linear equations modulo n

I have a system of linear equations $$ a+b+c \equiv 31 \pmod{54} $$ $$ 4a+2b+c \equiv 3 \pmod{54} $$ $$ 9a+3b+c \equiv 11 \pmod{54} $$ What should I input (I'm using ...
3
votes
1answer
181 views

Filling using colors rendered corresponding to the difference between two curves

Suppose there are two curves f1[x] and f2[x], and we want to fill the area between them using colors corresponding to the vaule of f2[x]-f1[x], so that any filling line segemts with the same length ...
13
votes
3answers
362 views

Variable scope similar to other languages

Mathematica, unlike many other languages, defines the variables in the global scope unless it is explicitly asked to define a variable in a local scope, e.g., using ...
0
votes
2answers
175 views

How to I get a nutrition facts chart from WolframAlpha?

When I try just a few items such as WolframAlpha["1 whole wheat tortilla + 2 slices american cheese + 150 g steak + 2 tbsp beans + 150 g white rice"] I get the ...
2
votes
3answers
208 views

Using Tooltip with Joined data on a plot

I have some data partitioned into three sublists: ...
4
votes
1answer
125 views

Text as plot axes values

I have some chemical data that I am plotting using ListLogPlot. ...
4
votes
1answer
182 views

Defining five-parameter Pearson distribution by moments

How do you derive (or where can I find a derivation of) the equations to match the five parameters of a general Pearson distribution to a mean, variance, skewness, kurtosis, and condition that the ...
5
votes
2answers
659 views

How to draw a graph about the FourierTransform of a 2D Function?

Here is a 2D function, and it cannot be calculated by the FourierTransfrom ...
3
votes
1answer
325 views

How do I get a list of unique random integers? Avoiding numbers being drawn twice [duplicate]

I am trying to get a set of random integers for which I used the function RandomInteger[{1, 50}, 5]. That way, however, there is the chance to get doubles such as ...
5
votes
0answers
97 views

What do the elements of the Parallel Kernel Status screen mean?

I just managed to get my multiple kernels up and humming on a new multi-core machine, which I am quite happy about. I am slightly at a loss, though, about the meaning of the different parts of the ...
7
votes
5answers
1k views

Filling between parametric plots

I am new with Mathematica, but am trying to fill an area between two parametric plots ...
13
votes
1answer
531 views

How to identify chemical substance from tattoo?

A friend of mine made a tattoo on his chest of some chemical substance formula. He challenged us to identify which substance is that. I thought that perhaps a combination of: Mathematica image ...
0
votes
1answer
115 views

InputField equations and Solve

I'm trying to get this piece of code to work: ...
12
votes
5answers
288 views

Can ReplacePart be sped up?

Test case: ...
1
vote
1answer
180 views

Domain restrictions for NMaximize

I am trying to solve a maximization problem, where my variable can only take a limited number of values. (Probably) the easiest example would be ...
2
votes
0answers
36 views

Using a variable in Get [duplicate]

This question is different from the answer here Infix form of PutAppend ( >>> ) does not work with variable becasue it is dealing with folders and not filenames. I have a file path which I ...
5
votes
1answer
781 views

Hodrick–Prescott filter (one-sided version)

I am interested in implementing Hodrick–Prescott filter (HP filter) on my time series data in Mathematica. I know that there is already a version of two-sided original filter for Mathematica (see ...
2
votes
2answers
138 views

global variables in compile statement

sorry for posting multiple questions about compile, but this is giving me some headache lately. This time my question is about using globally defined variables in a compile statement. The problem is ...
0
votes
0answers
173 views

symbolic solution for a system of nonlinear equations in mathematica

Would appreciate any help on the following in mathematica I cant figure it out. I have a system of equations that I am trying to solve symbolically. I have 9 equations and 8 unknowns (I have also ...
0
votes
2answers
194 views

Writing intelligent replacement rules for symbols

I am learning about quaternions right now, and I wanted to play around with some concepts I am learning. e.g. take rotation of a point about an axis with specified angle. ...
10
votes
1answer
178 views

How to monitor the communication between parallel kernels

Recently I increased the problem size in my code, and it scales up very badly using ParallelTable. With a lot of help from the this community, it seems that the ...
10
votes
5answers
503 views

How to find first list element that differs from average of N previous elements by more than a given amount?

Given a list of real numbers, I need to write a function that returns the value of the first element in the list that differs from the mean of the previous $N$ elements by greater than $P$ standard ...
4
votes
1answer
223 views

How to speed up calculations with large number of replacement rules?

In my program I have an expression which looks like: ...
7
votes
0answers
155 views

Fourier transform over a custom dimension

I have a multidimensional array A. Fourier[A] finds the discrete Fourier transform over all dimensions. How to find discrete ...
3
votes
1answer
115 views

Making time differentials look like the textbook [duplicate]

I need to have time differentials to look like the 'textbook'. My code is Dt[x y^2] /. {Dt[x] -> dx/dt, Dt[y] -> dy/dt} which gives the output ...
7
votes
1answer
232 views

Lie algebras packages (with E6, F4 & alii … included)

I am looking for an add-on that deals seriously with computations inside exceptional Lie algebras (and obviously classical ones ...): I want at least all standard basic data concerning them & ...
0
votes
0answers
136 views

The /. syntax in numerical methods [duplicate]

I have an analytical approximation method for solving an ODE and want to compare this to an NDSolve solution, but the syntax is confusing me. To get the solution from NDSolve, I define the ODE as eqn ...
0
votes
0answers
68 views

how to round result to 64 bit double precision number? [duplicate]

How do I round to ieee 64 bit floating point with mathematica? I've tried N[22250738585072014/10000000000000000 10^-308, MachinePrecision] and I get ...
7
votes
1answer
99 views

Bug in GeneratingFunction?

According to the documentation GeneratingFunction[a[n],n,x]==Sum[a[n]x^n,{n,0,Infinity}] However, for $a_n=1/(n+2)$ I obtain ...
6
votes
5answers
770 views

Fibonacci Sequence Generator

I'm trying to write a function in Workbench which will generate a Fibonacci sequence starting with F0 = 0 and F1 = 1. So far I ...
12
votes
1answer
227 views

MapIndexed and Compile

I am having trouble compiling a function that uses the MapIndexed function on the second level. The compilation runs fine, but at evaluation time I get an error ...
5
votes
1answer
212 views

Selecting a list from a list of lists

In working through Programming Paradigms Via Mathematica (A First Course) I have come across this two part question: A permutation of length "n" is a list of the first n positive integers in ...
4
votes
2answers
132 views

Workaround for Import not supporting the \leqslant TeX macro

$\{A\leqslant x\leqslant B\}$ Copy the code into Notebook, and you'll lose the less sign, this can be rendered well in ...
3
votes
1answer
152 views

Plotting Uncertainty for a Sample of Functions

I am trying to produce a plot showing the variation in a sample of functions. It should look like this plot or that plot. I tried to use SmoothDensityHistogram. ...
24
votes
1answer
753 views

Cheat sheets or reference cards for Mathematica

In order to improve my workflow with Mathematica, I'm looking for cheat sheets. The purpose of such reference cards is to be printed and to stay on the desk during the learning of a new programming ...
1
vote
1answer
134 views

How to keep front and back colors of Polygon in Graphics3D same all the time [duplicate]

I want the same face color for a 3D Polygon when viewed from front or back or from any angle. i.e. I want the color not changed under any conditions. Front and ...
4
votes
3answers
225 views

Computing the mean difference between elements in a list with index $i$ and the closest elements with index $(i+1)$

I have a list that looks like this: preprocessedList = {{1,5.3},{1,5.566},{1,1.4322},{2,3.443543},{2,3.444},{3,0.1223},{4,1.3243},{4,1.554343}} Each element in ...
4
votes
1answer
97 views

How to check if a Polynomial has a specific form

I have a polynomial F[x], for example F[x] = 1 - 2x + x^2. I wanna check whether F[x] has the form of ...
5
votes
1answer
246 views

How to avoid unpacking from Language`ExtendedFullDefinition

Consider this code: LaunchKernels[]; On["Packing"] a = RandomReal[{0., 1.}, {64, 30000}]; ParallelMap[Fourier, a]; // AbsoluteTiming Developer...
2
votes
1answer
445 views

How to define custom operators

I am currently running Mathematica 8 and I would like to know how to define custom operators. Let's say I define an operator called $\times$ where: $$a\times b = a+a\cdot b+b$$ I also want to know ...
5
votes
1answer
105 views

Maintaining stylesheet information in Cell[]

I am working on formatting a cell for a slideshow presentation format such that a graphics object occupies the left half of the cell and bullets or other items occupy the right. The ancient ...
1
vote
0answers
147 views

Issue with Coefficient command

I'm trying to used the Coefficient command to extract the numerical values in front of a Chebyshev polynomial. I know that there is a numerical way to do this, presented in numerical recipes, which I ...
2
votes
1answer
133 views

Selecting for morphological components that do not border the edges of an image?

Is there an easy way to select for morphological components which do not border/touch the edges of an image? Taking this doodle as an example: We'd want to only select morphological components ...

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