operations

I am trying to delete both a matrix in mathematica. An inelegant way of doing it is as I do below, i.e specifying it in a new matrix as S = Table[ Ss[[If[i < t, i, i + 1]]][[If[j < t, j, j + 1]]], {i, q}, {j, q}]; where the goal is to eliminate row and column t. Indeed delete a line is easy Delete[Ss,t]. For the column column I suppose I could do Transpose[Delete[Transpose[Ss,t]]] My primary concern is to do it in a way that executes the fastest way possible. More generally, is there a Mathematica operator that makes it as easy to slice and dice matrix columns as it is to do for rows without

I know there are some optimized algorithms around for all kind of matrix decompositions (QR decomposition, SVD,...), multiplications and the likes. Yet, I couldn't find a good overview. For C++, there is quite some useful information in this question , but I'm looking for those things in C. gnuf You did not mention whether you wanted an open-source or a commercial software, so here is a list containing both: GNU Scientific Library (GSL) Basic Linear Algebra Subprograms (BLAS) Meschach Numerical Algorithms Group (NAG) There was also this previous question on the subject. You might want to take

What is the difference between a single precision floating point operation and double precision floating operation? I'm especially interested in practical terms in relation to video game consoles. For example, does the Nintendo 64 have a 64 bit processor and if it does then would that mean it was capable of double precision floating point operations? Can the PS3 and Xbox 360 pull off double precision floating point operations or only single precision and in general use is the double precision capabilities made use of (if they exist?). VonC Note: the Nintendo 64 does have a 64-bit processor,

What are the order of operations when using two assignment operators in a single line? public static void main(String[] args){ int i = 0; int[] a = {3, 6}; a[i] = i = 9; // this line in particular System.out.println(i + " " + a[0] + " " + a[1]); } Edit: Thanks for the posts. I get that = takes values from the right, but when I compile this I get: 9 9 6 I thought it would have been and ArrayOutOfBounds exception, but it is assigning 'a[i]' before it's moving over the 9. Does it just do that for arrays? = is parsed as right-associative, but order of evaluation is left-to-right. So: The statement