Tagged Questions

Questions on how to write code in a better or different style, using Mathematica's capabilities for coding in multiple styles.

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3
votes
1answer
78 views

Use Style on list elements

I have a list like this: list = {0, 0, 0, 1, 1, 1} I want to color all the 0's in red, but I dont want to count through all the elements, like in my solutions, ...
2
votes
1answer
184 views

Converting a nested for loop from MATLAB

In MATLAB I have the following series of nested for loops that update a matrix. (It's not my code, but someone else's that I'm trying to replicate - I don't know ...
5
votes
3answers
400 views

What is the right way to write a function that includes other functions?

I want to include multiple sub functions: $b(x) = 10x$ $w(x) = s + b(x)$ $c(x) = x^2$ into two main functions: $ua(x) = w(x)-c(x)$ $ub(x) = w(x)-c(x)^2$ As a reaction to this answer, I wrote ...
0
votes
1answer
45 views

Combining list x-y data with a list of errobars into one list (mathematica-style)

Suppose I have a list of data I can ListPlot: { {x1,y1}, ... } , and a list of y-errorbars: {erry1, erry2, ... } Is there ...
33
votes
0answers
431 views

Is this the most effective and efficient programming style for prototyping (a ray tracer) in Mathematica?

I am trying out Mathematica as a prototyping tool. As an initial exercise I have put together a brute force ray tracer, with a view to using Mathematica's built in probability distribution functions ...
0
votes
1answer
94 views

Graphing the sequence {$p_k$} = $\frac{c - a + dp_{k-1}}{b}$ [duplicate]

Graphing the sequence {$p_k$} = $\frac{c - a + dp_{k-1}}{b}$ I need to know how to graph this function where it automatically plugs in the previous term for $p_{k-1}$, the coefficients are of my ...
1
vote
0answers
95 views

How can I make my MM code more compact and readable? Can I put functions in different notebooks?

I'm doing some coding in MM9, but my program is getting quite large. It's mostly a bunch of functions defined at the beginning of it, but it's getting to the point where I have to scroll for a few ...
3
votes
0answers
114 views

What can I do to improve the performance of my calculations?

I'm trying to express a simple probability problem in Mathematica, but am having trouble getting my calculations to execute at a reasonable speed. I have an object whose unknown location is modeled ...
29
votes
9answers
4k views

Programming paradigm change

I'm new to Mathematica, I've been learning by myself, and, being a Java developer for some time, it makes it hard to adapt. I've tried to solve a Reddit challenge, and I came up with this solution: ...
6
votes
3answers
340 views

Mathematica style (drawing cubes)

I wanted to draw (lattice-aligned) unit cubes inside a sphere with a given radius centered on the origin, so I wrote this program: ...
0
votes
1answer
72 views

Generalizing Characters to n-character substrings [duplicate]

I'm doing some frequency analysis on an encrypted plaintext. Tally[] and Characters[] make the basic task quite easy. To count the number of times each character appears (sorted alphabetically; ...
1
vote
2answers
147 views

Discretizing data using quantiles in Mathematica

I am trying to discretize a long array of real numbers into a uniformly distributed integer array. To do this I am identifying the quantile where each real value sits and writing it out to the output ...
1
vote
1answer
171 views

Looping with NDSolve?

I have a series of PDE equations that are solved with NDSolve for certain variables $a$ and $b$ - Now, I want to see the output at a time $t$ as $a$ and $b$ change; so I was thinking of a loop ...
11
votes
1answer
278 views

Is there a guideline about when to end expressions with semicolons?

Whether for nested Ifs or within scoping constructs like Module and Block, I never know ...
4
votes
1answer
329 views

Functional programming Style & Performance

Hello i have been spending time to convert my R tools into Mathematica Packages mainly because i like the functional programming style in Mathematica. In doing so it seems that i run into one ...
12
votes
4answers
372 views

Equivalent Nested Loop Structure

Consider the following examples: ...
3
votes
1answer
118 views

Should I end all definitions from packages with semicolon?

I noticed that if I open a .m file in Mathematica and click on the Run Package button, all the ...
9
votes
3answers
1k views

Guidelines on giving readable names to variables [closed]

I know that one cannot use underscore to a variable name, like degree_of_The_First_Polynomial. But for a long variable name, it ...
2
votes
1answer
102 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 ...
27
votes
3answers
950 views

Getting serious about Mathematica programming

I'm at a point in my Mathematica journey where I need to be a little bit more strategic about my coding. Presently, I have a bunch of notebook files organized using the filesystem of the OS and ...
4
votes
0answers
178 views

The guidelines for options or multiple arguments?

Where can I find some references concerning when to use options and when to use multiple arguments in designing and writing functions? Seems most built-in functions have arguments less than 3 and ...
77
votes
7answers
4k views

Can one identify the design patterns of Mathematica?

... or are they unnecessary in such a high-level language? I've been thinking about programming style, coding standards and the like quite a bit lately, the result of my current work on a mixed ...
5
votes
1answer
195 views

How to find the name of the current function

I would like to know the name of the current function from within that function. For example, consider the following code ...
5
votes
3answers
298 views

More structure in Source Code/Notebooks

Mathematica is great for small and quick projects and has a great syntax. However as soon as a project grows I run into trouble. How do you scale and maintain projects in Mathematica? What is beyond ...
3
votes
0answers
107 views

How do I add options to a built in function, which only apply to a certain class of argument?

I'd like to add an option to a built-in function that only applies when it is given an argument of a certain form. For example, something like this approach to extending ...
9
votes
2answers
984 views

How to write data from Mathematica to an existing formated Excel file?

I have a sheet in an Excel file already formated: different colors, fonts, columns width and cells styles. I want to fill-out values from Mathematica into specific cells of that sheets, or use that ...
12
votes
2answers
230 views

f[arg1, arg2,…,argN] vs. f[{arg1, arg2,…,argN}]

I am trying to reproduce the API of a function (written in R) that accepts an arbitrary number of arguments and handles it the same way as it would handle a single argument that is a list of different ...
11
votes
5answers
426 views

An elegant way to plot a numeric function that returns a list, and have each element in a different color

I have a function that takes a numeric argument and returns a list of numbers. I want to plot each element of the list in a different color. If I use this command, ...
1
vote
1answer
397 views

Lines with label in Plot options syntax

I wrote a little function to add lines with labels to plots. It just creates customized {GridLines -> ..., Epilog -> ...} code: ...
6
votes
4answers
1k views

Alternatives to While Loops?

I am using Mathematica to run a probabilistic simulation. Essentially, I have a list of members of a population (they only have one, numerical, attribute, so it's just implemented as a list of ...
11
votes
2answers
381 views

Notebook formatting - easier descriptions for equations and results?

When I do computations in mathematica, I generally try to make it readable for myself-in-the-future. This can be a cumbersome task in mathematica, where it often requires me to switch betwee a text ...
7
votes
1answer
192 views

What is the purpose of Dump contexts?

Motivation I've been trolling through some internal code, trying to glean design practices WRI developers employ when extending Mathematica using top-level code. During my ...
8
votes
2answers
708 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 ...
6
votes
0answers
114 views

What are some general strategies to avoid using For loops? [duplicate]

Possible Duplicate: Iterating over lists in Mathematica While there are some cases where a For loop might be reasonable, it's a general mantra – one I ...
11
votes
2answers
536 views

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

I can do Cholesky in a procedural style, such as: ...
9
votes
3answers
650 views

Generating an autoregressive time series

Find $X_t = c_1 X_{t-1} + \dots + c_n X_{t-n} + n_t$ for given $c_i$, initial conditions $(X_1, \dots, X_n)$, and distribution for i.i.d. $n_t$. I would like to know if there is a more efficient or ...
13
votes
2answers
803 views

Speeding up random walk for many particles

I am trying to speed up this code for many particles to take a random walk. I'm not sure why it is so slow for such a simple task. I got a few hints from colleagues to reduce the precision of the ...
10
votes
3answers
401 views

Are these nested Tables necessary?

In exploring this fish population game with my calculus students, I wrote some Mathematica code to search for the sequence of catches that would result in the maximal total population of fish (both in ...
13
votes
4answers
378 views

Short syntax for accessing System`Utilities`HashTableAdd and System`Utilities`HashTableGet

I have a need for a struct analogue in Mathematica. After reading this post I came to the conclusion that System`Utilities`HashTable is one of the best options. But ...
12
votes
2answers
456 views

Are there advantages to using generalized Part extraction instead of specialized functions like First, Last?

There are many ways to extract different parts of lists in Mathematica. For example, the first part of a list v can be accessed either as ...
8
votes
3answers
351 views

Can this code be written in a more functional style

Referencing this question, I wonder if the following code can be written more concisely using a functional style, i.e. without For loops or ...
19
votes
2answers
2k views

Extracting values from nested rules in JSON data

I have been using Mathematica to analyse some data from the StackExchange API. It is conveniently available in JSON form, which Mathematica interprets as replacement rules. However, some of the rules ...
16
votes
1answer
334 views

Are there advantages to using additional arguments of common functions rather than alternative ways of calculating with lists?

(Apologies for the long question title.) One of the interesting, if sometimes confusing, things about Mathematica is that there is always more than one way to do things. Even intermediate users can ...
5
votes
1answer
261 views

Alternative to overloading Set

In the ideas shared in my answer to this post Struct equivalent in Mathematica? at the end I propose a solution that changes the way Set works in a particular case that can be expressed in plain words ...
77
votes
7answers
7k views

Struct equivalent in Mathematica?

I really miss having something like a struct in Mathematica. I know of (and regularly use) a couple of programming techniques which feel like a ...
12
votes
3answers
427 views

With versus Function

I've seen people compare Block with Module and With as scoping constructs, and try to figure ...
35
votes
5answers
668 views

Placement of Condition /; expressions

It is my practice to place Condition expressions on the left side of := and :> in almost ...
94
votes
3answers
13k views

Alternatives to procedural loops and iterating over lists in Mathematica

While there are some cases where a For loop might be reasonable, it's a general mantra – one I subscribe to myself – that "if you are using a ...