11k 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 Mathematica?...
189 views

### How does MakeBoxes handle an n-ary operator?

I want to format results from Reduce using the $\cup$ symbol instead of the $\lor$ symbol. For example, ...
8k views

### How to request financial data from Yahoo's YQL and Quandl?

How can I download historical data from Yahoo ? Although Mathematica's FinancialData function uses Yahoo it could be useful to have more control on how to retrieve data from Yahoo's YQL. Edit ...
3k views

### Higher order SVD

Does anyone know how to do a higher order SVD in Mathematica ? A good reference seems to be here http://www.sandia.gov/~tgkolda/pubs/pubfiles/SAND2007-6702.pdf but I don't understand their formalism ...
516 views

### Neural network illustrations

(Since this post was met with a certain reluctance to be given answers, a version of it is also posted in Community.) Please share neural networks diagrams you have made in Mathematica / WL. Here is ...
47 views

### Why don't these function definitions work? [closed]

picked up Mathematica (transitioning from Python) a couple of days ago so forgive me for the newbie question. I'm trying to create a function which takes in a list of numbers and returns a list of the ...
472 views

### Make mathematica treat $e_i^2$ as numeric

With NumericQ[symbol] = True, I can declare that a symbol is numeric. I want the expressions matching: $$e_{\text{i\_}?\text{IntegerQ}}^2$$ to be treated as ...
522 views

### Using Boost with CreateLibrary

I was looking at the answer of Leonid of Faster alternatives for DayOfWeek and wanted to see how hard it would be to do something similar in C++ using an external library like Boost. I tried to ...
4k views

### Automatically generating a dependency graph of an arbitrary Mathematica function?

Has anyone written a function to pull the function dependencies of a function? That is, it would be nice to have a function that returns a list of function dependencies as a set of rules, terminating ...
7k views

### How to efficiently find positions of duplicates?

Is there an efficient way to find the positions of the duplicates in a list? I would like the positions grouped according to duplicated elements. For instance, given ...
2k views

### How to Combine Pattern Constraints and Default Values for Function Arguments?

EDIT: As several respondents have noted in the answers and comments below, the original example had a default value that would never be used because of the way patterns and default values are ...
7k views

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: <...
876 views

### Symbolic derivatives are being calculated numerically

Update: (1) By V11, not sure of the exact version, the derivative IntegerPart' has been given a symbolic definition. (2) The numeric derivative computed has changed ...