20
votes
1answer
245 views

How does Return work?

It is not completely clear to me how Return[] works. The documentation says: Return[expr] returns the value expr from a ...
71
votes
7answers
3k views

What are some useful, undocumented Mathematica functions?

There have already been some questions about some undocumented functionality in Mathematica. Such as (please add to these lists!) How can one find undocumented options or option values in ...
20
votes
2answers
723 views

Roughly how many times per day may WolframAlpha[] be used?

The integration of Wolfram|Alpha seems to be one of the (many!) major features of Mathematica 8. Earlier I was reading this Wolfram Blog archive and noticed quite a few articles talking about the use ...
19
votes
2answers
666 views

Data Table Manipulation in Mathematica: Step 2

In this previous post (Data Table Manipulation in Mathematica) we find the brilliant suggestion proposed by Leonid Shifrin that allows to select specific rows identified by the header name. I'm now ...
7
votes
2answers
285 views

automatic coloring of function names

Usually, when I define a function and then use it later, the function name is colored in black. But every once in a while, the function color is blue, both in its definition and when I use it later. ...
55
votes
5answers
3k views

Minimal effort method for integrating C++ functions into Mathematica

As of Mathematica 8, what is the minimal effort way to integrate an existing C++ function into Mathematica? I think we have these: MathLink (it was quite long ago I used it last time) communication ...
36
votes
4answers
2k views

Point Renderings Slightly Off in Mathematica

The Mathematica code ...
26
votes
2answers
523 views

Undocumented form for FilledCurve[]

New in Mathematica 8 is FilledCurve (and its cousin JoinedCurve). The docs state that this function can take a list of segments ...
5
votes
1answer
229 views

How do I find a weighted bipartite graph's minimum edge cover using Mathematica 8?

In graph theory, we use the Hungarian Algorithm to compute a weighted bipartite graph's minimum edge cover (a set of edges that is incident to every vertices, the one with the minimum total weight.) ...
21
votes
2answers
611 views

How does Plot work?

I considered the following function: sin[x_] := Module[{}, Print["x=", x]; Sin[x] ] in Mathematica. Next, I tried to plot it using: ...
4
votes
2answers
207 views

Better use of Mathematica's PolynomialReduce[]?

I've been using scPhiDecomp[expr_]:= PolynomialReduce[expr, {x^2-y^2,2 x y}, {x,y}] which works great on ...
88
votes
5answers
3k views

How can one find undocumented options or option values in Mathematica?

Mathematica has a lot of undocumented or poorly documented options. How does one go about working out if there is an undocumented option that might solve a particular problem? How does one work out ...
18
votes
2answers
638 views

How safe is Encode?

How safe is an encoded package (using locked, etc)? If I don't specify a personal key, I understand that the encoding key must be somewhere in the Mathematica program itself, and so it is not a ...
39
votes
0answers
877 views

Numbered equations/formulas

How do you number equations in Mathematica notebooks so that they are exported correctly into latex? In case you don't know how to put numbered equations here is quick review. Open a new notebook ...
34
votes
3answers
705 views

Replace inside Held expression

I wish to make functional replacement inside Held expression like this: ...
40
votes
4answers
3k views

Creating Mathematica packages

I'm building a package to help me write packages and their documentation. In this post I explained how to make a package and its documentation. In the answer I provided I describe how to build a very ...
44
votes
2answers
1k views

What are the best practices / most common / idiomatic ways to report errors in Mathematica?

In particular, what are the best ways to report errors about incorrect arguments to a function? Checking for the correct arguments is relatively easy using patterns, but how to report an informative ...
17
votes
2answers
261 views

Symbolic derivatives are being calculated numerically

Just found the following while debugging a problem. Mathematica is calculating the derivative of IntegerPart[x] in some odd way: ...
30
votes
3answers
682 views

Is there a Mathematica API for the functions.wolfram site?

Is there a Mathematica API for the functions.wolfram site? If there's not, has anyone implemented a web scraper for it? For example it would be nice to be able to access ...
91
votes
3answers
12k 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 ...
38
votes
3answers
779 views

The clearest way to represent Mathematica's evaluation sequence

WReach has presented here a nice way to represent the Mathematica's evaluation sequence using OpenerView. It is much more clear way to go than using the standard ...
23
votes
7answers
477 views

What kinds of uses of SymbolicC (introduced in Mathematica 8) do you foresee? Are there any neat examples already?

Mathematica 8 introduced SymbolicC, a set of Mathematica functions that capture C language constructions in the familiar Mathematica tree-like fashion. Additionally, there are functions to write ...
36
votes
4answers
3k views

How to change the default ColorData used in Mathematica's Plot?

This question leads on from the recent question What are the standard colors for plots in Mathematica? There it was determined that the default color palette used by ...
7
votes
2answers
433 views

How does Mathematica determine that an evaluation should be terminated?

How exactly does Mathematica determine that evaluation of particular expression should be finished and the result should be returned? Here are some examples of unclear behavior which have arisen, ...
26
votes
3answers
2k views

Data Table Manipulation in Mathematica

I am a statistician searching for an efficient way to select rows or columns from a table of data in Mathematica. Let me pose the question in 2 parts with a SQL-style table of data: ...
95
votes
3answers
4k views

Performance tuning in Mathematica?

What performance tuning tricks do you use to make a Mathematica application faster? MATLAB has an amazing profiler, but from what I can tell, Mathematica has no similar functionality.
14
votes
5answers
4k views

Plotting discontinuous functions without spurious vertical segments

Consider the plot of this discontinuous function: f[x_] := If[2 < x < 3, 0, x] Plot[f[x], {x, 0, 5}] I'd like to plot that without the vertical segments. ...

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