0
votes
1answer
371 views

Simplify equations using list of rules

I have a set of equations that I want to simplify using a list of rules: ...
2
votes
1answer
254 views

How to obtain a Symplectic 4×4 matrix?

I have a problem in obtaining a $2n \times 2n$ Symplectic matrix $T$, with $n=2$. I couldn't find a direct command in Mathematica to achieve this. Conditions: ...
10
votes
6answers
342 views

Using MapIndexed only at certain elements of a list

MapIndexed is a very handy built-in function. Suppose that I have the following list, called list: ...
9
votes
4answers
454 views

Autocomplete InputField

Is there a way to define a InputField that displays a list of options as you type? More specifically I'm looking for an ...
0
votes
1answer
147 views

How can a package use a variable of a notebook?

I have defined a function g in a package. It is: g[x_]:=x/.t->3 Now I work in notebook with the command: ...
9
votes
5answers
475 views

Span a function across several consecutive elements in a list

Suppose that I have a list called list. I would like to span an arbitrary function f across specified consecutive elements in ...
1
vote
4answers
439 views

Recurrence relation in a table

I am trying to generate a list of x-values for a function using a module, where my x-value must increase by 'a' if the term ...
-1
votes
1answer
320 views

Help in NIntegration Methods - Takes too long, why?

I have this code. It is a triple integral, and using the automatic method gives me a wrong answer for $T=0.1$ (the correct answer is $5.44$, while I got $3.73$ ). I've tried to change the integral ...
16
votes
1answer
953 views

Slow import of multigigabyte TIF image stacks

Update 6: After contacting Wolfram Technical Support, I was advised that the frame-to-frame import timing variability can be eliminated by reading in the frame stack from frame to frame with the ...
5
votes
2answers
204 views

Extract substring by repeated StringPattern

This code failed, but may exemplify my intention. StringCases["aA1bbbbbbbbbbaA2baA3b...aA4b",Repeated[Shortest["a"~~xx__~~"b"],{2,100}]] I want to get the ...
5
votes
2answers
259 views

Is it possible to manipulate FindFit

I was wondering if it is possible to manipulate a FindFit[] function. As a basic example, if I had an equation $ax^2+bx+c$ and a set of data, would it be possible ...
3
votes
1answer
566 views

Explanation about RegionFunction and MeshFunctions?

In the link, ParametricPlot3D, consider the example(Variation on the Spheres) given in the Neat Examples section. Can someone please explain how ...
2
votes
1answer
641 views

Plot a 3D vector field from a file [duplicate]

I have a data file with six columns {x,y,z} and {ux,uy,uz} respectively, and I would like to plot the 3D vector field. http://www.mediafire.com/download/udoa61hu0m6itrc/campo.txt I'm trying to do ...
3
votes
2answers
272 views

How to automatically restart Mathematica kernel after out-of-memory error

I want to run a Mathematica code repeatedly, even after the kernel shuts down when it is out of memory, because I have designed my program to continue appending the data to a file. Currently, I have ...
2
votes
2answers
156 views

How to unthread?

For example {a + b} == {c + d} // Thread (*{a + b == c + d}*) how to get {a + b} == {c + d} from ...
2
votes
0answers
133 views

Mathematica with a Touchpad

I'm trying to make it so that you do not need to rely on keyboard presses to manipulate a 3D graphic. I've done some searching, but I can't find a way to make it so that Mathematica will recognize ...
2
votes
1answer
101 views

Map and Scan ignore HoldFirst

I am trying to write a simple function that takes a list of data and outputs it to a file. I'd like the name of the file to be the same as the variable that holds the list. It seems that giving a ...
0
votes
1answer
354 views

Filling from Gridline to edge of plot

Hi I would simply like to fill in the region from a vertical gridline to the right boundry of the plot Here is an example ...
2
votes
1answer
124 views

How to rescale a Graphics3D object?

I've created a Graphics3D object by extruding a binary 2D image (as shown here). ...
0
votes
2answers
134 views

How can I transform a quadratic into an factored equation?

How can I transform a quadratic polynomial in x and y into an equation of the form $(x-a)^2+(y-b)^2=c$? f = -9 x + (3 x^2)/4 + (3 y^2)/4; Completing the Square ...
20
votes
2answers
3k views

How to fit 3 data sets to a model of 4 differential equations?

I'm a biologist and a newbie in Mathematica. I want to fit three data sets to a model consisting of four differential equations and 10 parameters. I want to find the parameters best fitting to my ...
2
votes
1answer
301 views

How to get 'exact' expression for result

I have a result from Mathematica for which want to have the exact expression, i.e. all of the arguments of type # replaced. It is given by: ...
14
votes
3answers
788 views

Logarithmic slider

Is it possible to create a logarithmic slider similar to this one that responds to a change of the variable value? That is, when the slider is moved, the variable value should update. When the ...
7
votes
5answers
602 views

Building graph based on the cities connection?

I built a Graph based on the permutations of city's connections from : ...
2
votes
2answers
138 views

Graph two interpolations together

I have created two functions, inter1=Interpolation[points1] and inter2=Interpolation[points2]. This creates two functions, I ...
0
votes
2answers
63 views

Efficiently adding a fixed real numbered value to a set of elements in an array

Imagine I'm trying to add some value $r$ to each element in a very large array $L$. Take for example: L = Table[RandomReal[{0,1}],{q,1,10^7}]; r = 0.0032; I can ...
0
votes
1answer
655 views

ParallelTable 70 times slower on 16 cores than Table on single core

Consider these code(sorry it's messy), why the ParallelTable version is 70 times slower than the Table version? ...
2
votes
1answer
59 views

Prevent Cell Deletion

How might I be able to prevent a Cell form being deleted when you press the Delete key? Maybe there is a way to display some type of ...
3
votes
1answer
226 views

DistributionFitTest with WeightedData?

My problem is related to statistical testing with weighted data. I have a data sample and I assume that a part of the data follows a specific distribution (Pareto). So I fit my data to a distribution ...
1
vote
1answer
147 views

Ways to access lists inside lists

I have gone through some reference material but I am not getting really good links that will help me grow understanding of ...
4
votes
1answer
1k views

How to make a multi-peak histogram fitting

I got a multipeak histogram from my data and want to fit it using a Gaussian Distribution function. ...
1
vote
2answers
240 views

Why is Text in an Image cut off?

I want to create a long, skinny Image containing only text. This makes a square image of the default size. ...
0
votes
0answers
203 views

Select and plot real positive solutions for a sixth order parametric equation

I need your help in order to solve the following problem: I have a sixth order equation: $ax^6+bx^5+cx^4+dx^3+ex^2+fx+g=0$ and I solved it using Solve[] command, ...
2
votes
1answer
193 views

Customizing the numbers used by DisplayFormulaNumbered cells

I was typesetting some formulas and I encountered a formula number marked with a prime. I am using the DisplayFormulaNumbered cell style`. How can I add a cell ...
4
votes
1answer
331 views

Getting vertical bar of equal length for | a || b | in a notebook

How can I make |a|*|b| show well in a notebook? I typed | from keyboard to denote absolute value. General cleanupIt will auto adjust by matching in my notebook so that sometimes it will not show as ...
2
votes
3answers
108 views

Reversibly merging sets of $k$ adjacent elements in an array

Say I have an array of the form: ExampleArray = {{1}, {2}, {3}, {4}, {5}, {6}, {7}, {8}, {9}, {10}, {11}, {12}}; I'd like to be able to reversibly merge sets of ...
0
votes
0answers
139 views

Binomial Distribution (binomial model inspired by Merton)

Binomial Distribution (binomial model inspired by Merton) Hi I want to do the following and I hope that anyone of you can help me out. In short, I have a portfolio consisting of 10 companies, ...
-4
votes
1answer
534 views

Symbolic Definite Integration

How do I perform Integrate[Sin[x]^2/(z^2 + R^2 - 2 zRCos[x])^(3/2), {x, 0, Pi}] where z and ...
0
votes
0answers
2k views

axis label formatting in Plot3D [duplicate]

I have the following code: ...
1
vote
0answers
321 views

Polynomial factorization over finite fields with non-prime order

One can easily factor a polynomial over finite fields of prime order, using Factor command: ...
5
votes
1answer
4k views

Opening .nb in other software or exporting to other languages

I am collaborating on a spare-time project with someone else that has access to Mathematica. I do not. He has supplied me with his notebook file. Is it possible for me to open, or import this file ...
2
votes
2answers
225 views

Modifying imported 3D file

Since I am visualizing my work using Mathematica, I import some 3D models of molecules to my notebook. So, the question is, is there any way to modify somehow that imported models inside Mathematica ...
2
votes
2answers
200 views

Replacing all values in a table > $T$ [duplicate]

I want to generate a table of Euclidean distances from the points in a list to a given point, e.g.: ...
2
votes
1answer
108 views

Clickable Bounded Diagram

Suppose I make a BoundedDiagram via the following code ...
2
votes
1answer
58 views

How do I force all Graphics Text to be StandardForm?

I've been playing around for while trying to determine how to get all graphic objects to use StandardForm fonts. That is, I want all axes labelling, titling, legends, inserted text, etc., for 2D/3D ...
0
votes
1answer
207 views

Calling functions which take their arguments interactively

Lets say I have a file named test.m containing some functions. ...
3
votes
3answers
257 views

Conjugating symbolic expression

I am trying to conjugate a symbolic expression, and I have explicitly stated the real terms. However, I simply can't get it to work: ...
7
votes
2answers
370 views

Colorize and the Four-Color Theorem

We can write: MorphologicalComponents[image] // Colorize To assign a random set of colors to each component in some image. The example used for reference by ...
3
votes
2answers
212 views

How to store multiple plots to be viewed later

I need to be able to import my data and create multiple listlineplots, but my inputs for each plot are very large. I am able to assign variables to each plot and then use GraphicsGrid to view them ...
4
votes
1answer
171 views

How to set return type of `InterpolatingFunction ` in compile

Consider this ...

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