notation

I've got an n-by-k sized matrix, containing k numbers per row. I want to use these k numbers as indexes into a k-dimensional matrix. Is there any compact way of doing so in MATLAB or must I use a for loop? This is what I want to do (in MATLAB pseudo code), but in a more MATLAB-ish way: for row=1:1:n finalTable(row) = kDimensionalMatrix(indexmatrix(row, 1),... indexmatrix(row, 2),...,indexmatrix(row, k)) end If you want to avoid having to use a for loop, this is probably the cleanest way to do it: indexCell = num2cell(indexmatrix, 1); linearIndexMatrix = sub2ind(size(kDimensionalMatrix),

From MDN: The :: notation was introduced in CSS 3 in order to establish a discrimination between pseudo-classes and pseudo-elements. Browsers also accept the notation : introduced in CSS 2. If the notation : will always be accepted by CSS3 browsers, should I use it because it works on old and new browsers? Or should I use both of them, : for old browsers and :: for new ones, because the notation : won't be always accepted? Note : I think my question isn't a duplicate isn't a duplicate of Should I use single or double colon notation for pseudo-elements? because the other question asks about

Possible Duplicate: c++ * vs & in function declaration I know that this probably seems like an incredibly elementary question to many of you, but I have genuinely had an impossible time finding a good, thorough explanation, despite all my best Googling. I'm certain that the answer is out there, and so my search terms must be terrible. In C++, a variety of symbols and combinations thereof are used to mark parameters (as well as arguments to those parameters). What, exactly, are their meanings? Ex: What is the difference between void func(int *var) and void func(int **var) ? What about int &var

I'm confused about what's the correct way to ignore the contents of a directory in git. Assume I have the following directory structure: my_project |--www |--1.txt |--2.txt |--.gitignore What's the difference between putting this: www And this? www/* The reason I'm asking this question is: In git, if a directory is empty, git won't include such empty directory in repository. So I was trying the solution that is add an extra .gitkeep file under the directory so that it won't be empty. When I was trying that solution, if in the .gitignore file, I write like below: www !*.gitkeep It doesn't work

I'm looking at the documentation for FileUtils. I'm confused by the following line: FileUtils.cp %w(cgi.rb complex.rb date.rb), '/usr/lib/ruby/1.6' What does the %w mean? Can you point me to the documentation? %w(foo bar) is a shortcut for ["foo", "bar"] . Meaning it's a notation to write an array of strings separated by spaces instead of commas and without quotes around them. You can find a list of ways of writing literals in zenspider's quickref . Mike Woodhouse I think of %w() as a "word array" - the elements are delimited by spaces and it returns an array of strings. There are other %

What does a 0x prefix on a number mean? const int shared_segment_size = 0x6400; It's from a C program. I can't recall what it amounts to and particularly what the letter x means. Literals that start with 0x are hexadecimal integers. (base 16) The number 0x6400 is 25600 . 6 * 16^3 + 4 * 16^2 = 25600 For an example including letters (also used in hexadecimal notation where A = 10, B = 11 ... F = 15) The number 0x6BF0 is 27632 . 6 * 16^3 + 11 * 16^2 + 15 * 16^1 = 27632 24576 + 2816 + 240 = 27632 In C and languages based on the C syntax, the prefix 0x means hexadecimal (base 16). Thus, 0x400 = 4×