This tag is intended for the review and improvement of style for already functioning code. It not meant to change the objective of the code.

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2
votes
1answer
103 views

Writing a function to mimic Characters

I am working my way through Programming Paradigms via Mathematica (A First Course) and have answered the following question in lesson 25: Write a function of one argument "s", a String, which ...
6
votes
2answers
150 views

Looking for feedback on this function

I'm not sure this is an appropriate question; if not, I'm sure someone will close it :) I've got the following function, listed below; its job is to accept a graph (function) presented either as a ...
1
vote
2answers
369 views

Collatz Tool Box — any speed ups possible?

I have created a tool box for experimenting with the Collatz conjecture. Info here: Wolfram MathWorld and here: Wikipedia The patterns I have found allow us to make the conjecture jump through some ...
13
votes
4answers
479 views

Button evaluation inside DynamicModule

Someone know why this Button works when clicked: ...
11
votes
2answers
307 views

Clever use of DownValues, or failure to understand the “Mathematica Way.”

I needed to look at the changes in the values of about 4000 items from one year to the next. I have a table with identifiers and values for each year. Not all of the items are in each list. The ...
0
votes
0answers
62 views

how to generate repeatable Unique streams?

I need to label some data in arbitrarily nested ragged lists, with a stream of unique labels. It's very convenient if the labels are consecutive integers, starting at 0 or 1, and if I can produce the ...
3
votes
1answer
545 views

Function to Determine Lucky Numbers

Given a list of the form {1, 3, 5, 7, ...}, the lucky numbers are obtained by looking at the first list element after 1 (so 3 in this case), and deleting all list ...
4
votes
6answers
1k views

Why is this Mandelbrot set's implementation infeasible: takes a massive amount of time to do?

The Mandelbrot set is defined by complex numbers such as $z=z^2+c$ where $z_0=0$ for the initial point and $c\in\mathbb C$. The numbers grow very fast in the iteration. ...
2
votes
1answer
172 views

EmpiricalDistribution for Gini Coefficient Runs Slow

I am repurposing code that I found in this blog post (http://datavoreconsulting.com/sports/gini-coefficients-and-the-olympic-medal-race/) to generate the Gini coefficient for other data sets I am ...
2
votes
1answer
67 views

Unique[] in RHS of rule

I have a function, explicit that takes dot product of two symbols, and replaces it with repeated dummy indices generated by ...
4
votes
1answer
127 views

Copying a symbol using a subpackage

In this question, there is a beautiful method to copy a symbol. However, i'm not able to use it as an addon to my package. So the main question is How to rename/copy a function defined in a ...
19
votes
2answers
384 views

Copying one symbol into another

I would like to know how can I completely copy one Symbol to another. When I say copy, a refer to UpValues, DownValues, ...
8
votes
2answers
464 views

Feedback on Functional Programming: Propagation of uncertainty

Lately I've been trying to use functional prgramming and tried to implement the gaussian propagation of uncertainty (without correlation) in an elegant way, here is the outcome: ...
21
votes
1answer
614 views

Strategies for solving problems involving searches

As an example of a search-oriented problem, consider finding all constrained $n$-colorings of a graph. An "$n$-coloring" associates one of $n \ge 1$ colors to each vertex in such a way that no edge ...
2
votes
3answers
824 views

Using DSolve to solve for x[t,parameter]

I'm trying to solve an ODE with two independent variables (a cannon firing from a cliff incorporating wind resistance dependent on velocity). I've tried the following for the x-component: ...
6
votes
2answers
876 views

Elegant way to handle columns operations

Inspired by this question from @sjdh and by my recurrent use of columns operations in database sets, I was looking for one way to make columns operations more symetric, so I can handle with matrix and ...
0
votes
1answer
410 views

Calculating orbital period for the logistical map [closed]

I have the following MatLab code ...
4
votes
1answer
173 views

Feedback on my Subscript code

I have written a code, and I need a little feed back.. I want to make the Subscript distributive across (1) addition and (2) multiplication to mimic short-hand for ...
-1
votes
1answer
171 views

Some Problem with WhenEvent!

Anyone knows what's the problem with the following code and how can I fix it? I am not sure that I wrote the WhenEvent section correctly. By the way, I want to solve the equations and then plot y vs. ...
2
votes
1answer
556 views

3 hour calculation? ParallelMap & ParallelTable

I'm having some problems with slow Mathematica code... I'm basically doing a computation that's is expected to take 3 hours (!) in my Core i7 with 4 processors... I'm basically computing an index (of ...
2
votes
1answer
187 views

How to override `?NumericQ`

I have a function myFunc which I is to be displayed cleanly if arguments are symbolic, but which can also be numerically evaluated. I do this by defining a ...
3
votes
3answers
546 views

Speed optimization

I have a part of a program that I have to repeatedly call many times (about 2000 to 10000 times) ...
4
votes
3answers
1k views

How to fix BodePlot that comes with Mathematica?

I am using Mathematica to go through the examples and exercises on the book Modern Control Systems, 6th edition by Dorf. On page 605, there is a table (Table 8.5) with the Bode plot for several ...
9
votes
1answer
459 views

TemporalData frequency option as in R

I'm studying R, and am very impressed by the simplicity of some commands and in the way R handles temporal data. For example, in R, if you have some one-dimensional temporal data, you can easily ...
3
votes
1answer
105 views

Best way to transform text into number in a big array

I have a big array of data that I imported from a lot of XML files. To get the data, among other manipulations, I use this function: ...
13
votes
9answers
580 views

Thread over list in different levels

I have these two lists, both with the same length in the first dimension: ...
5
votes
2answers
601 views

How to create a simple interface to get file path and execute some code on it?

I need to create a simple user interface to choose one file in the notebook directory, import it and execute some functions on the imported data. For the first version I created this code: ...
14
votes
1answer
1k views

Poisson solver using Mathematica

I am looking for some help with a Poisson solver I am writing in Mathematica. The code is quite long with Arrays plugged in, so the full details can be found at http://pastebin.com/uSrSDcW6 I am ...
12
votes
3answers
568 views

Simpler way to fill date gaps with zero values

One basic problem when working with data like sales and dates is the case where you dont't have sales in all days, so you have to fill it to take information as average or to make a plot. See this toy ...
3
votes
1answer
300 views

How to improve this dynamic progress bar code

I created this progress bar to use in my codes: ...
22
votes
1answer
706 views

Fast Spherical Harmonics radiative transfer

This is a rather specific question and I apologize for spamming you with some lengthy code. But it could be interesting for some reader and maybe you can help out, so please bear with me. I am using ...
8
votes
2answers
733 views

Speed up Mathematica code involving Convolve

I'm trying to plot the averaged autocorrelation function of a random wire profile $\xi(x)$ which is build from unitsteps which are each L units long. To calculate the average I'm generating nMax ...
4
votes
1answer
239 views

Symbolic bit vectors

I'd like to see how addition and xoring bitvectors mix together. To do this, I implemented (a primitive) vec_add and vec_xor: ...
11
votes
2answers
556 views

What's the most “functional” way to do Cholesky decomposition?

I can do Cholesky in a procedural style, such as: ...
7
votes
4answers
579 views

Loop optimization

I wrote this to generate a 6D distribution of particles. ...
25
votes
7answers
1k views

Splitting words into specific fragments

I am looking into splitting words into a succession of chemical elements symbols, where possible. For example: Titanic = Ti Ta Ni C (titanium, tantalum, nickel, carbon) A word may or may not be ...