I'm trying to harness the power of the GPU (nVidia Quadro NVS140M) to speed up some matrix computations in my project. I'm reading through some documentation (programming guide, best practices guide, and reference manual), but not sure which section(s) I should focus on. It would be great if I can receive some advices on this. Also, I'm...
Basically, given a quaterion (qx, qy, qz, qw)... How can i convert that to an OpenGL rotation matrix? I'm also interested in which matrix row is "Up", "Right", "Forward" etc... I have a camera rotation in quaternion that I need in vectors... Thanks! ...
i found a library called pyeuclid and it seems to do what i want in respect to 3D math. it contins a 3D vector class and a 4X4 matrix class capable of transformations like rotate,translate and scale. matrix creation is simple, simply pass along the arguments and the matrix is created. >>> m = Matrix4() >>> m.translate(50,50,50) Matri...
Hello! I need to do a in-place transposition of a large matrix(so the simplest way to allocate another matrix and transpose to it won't work). Unfortunately, this large matrix isn't square. And worse, the matrix is stored in an array of doubles with number of columns and rows stored separately. I found that boost has the uBLAS library,...
How do I build a 2d matrix using STDIN? If I input a matrix like so: 1 2 3 4 5 6 7 5 6 7 8 9 4 5 6 3 3 3 how do I input this and create two matrices out of this? Here's my code so far while (defined ($a=<STDIN>)) { chomp ($a); push @a,($a); } This is just for the input. My understanding is I can just add each row...
Okay, I've been struggling with this all weekend, and I've gotten plenty of help but I'm still not getting it. Here is my code so far: what I want to do is build a few matrices from user input. Eventually I want to multiply them. Another story. input is as follows 1 2 2 4 4 5 6 6 1 2 2 3 1 2 2 3 sub makeMatrix { my ($input) = @...
When we're talking about matrices or a matrix, what does "unary minus" stand for as an arithmetic operator? ...
Hello, I know my question is not really a programming question but it came out of programming need. Does anyone happen to know the convolution matrix for diagonal motion blur. 3x3, 4x4 or 5x5 are all good. Thanks, ...
Hi Everyone, I am currently working on a nice little 2D game engine in AS3. You can even load in different flash movie clips through XML for the different animations. One of the features also allows you to flip an animation when you perform a certain action. That way you could have 1 animation for both left and right (as usual). I have t...
I have a list of lists, something like [[1, 2, 3,],[4, 5, 6,],[7, 8, 9]]. Represented graphically as: 1 2 3 4 5 6 7 8 9 I'm looking for an elegant approach to checking the value of neighbours of a cell, horizontally, vertically and diagonally. For instance, the neighbours of [0][2] are [0][1], [1][1] and [1][2] or the numbers 2, 5...
I need to write a program that uses matrix multiplication to rotate an image (a simple square), based on the center of the square, a certain amount of degree based on what I need. Any help on this would be greatly appreciated. I almost have no clue as to what I'm doing because I have not taken so much as a glance at Calculus. ...
Hi! Are there some implementations of sparse matrices visualization in C# ? I know that spy function do such thing in matlab, but didn't find any implementations in C#. Regards ...
Hi, Does anyone have a function that returns the perspective projection of a 3x3 matrix in C++? Matrix Perspective() { Matrix m(0, 0, 0); // Creates identity matrix // Perspective projection formulas here return m; } ...
I need some help in converting a 2X2 matrix to a 4X4 matrix in the following manner: A = [2 6; 8 4] should become: B = [2 2 6 6; 2 2 6 6; 8 8 4 4; 8 8 4 4] How would I do this? ...
When i generate report in my ssrs solution all my headers are comming correct. But same when i run from the report manager in browser all my columns are get merged to left side of the screen. But when i same in excel again it will be proper..how can i correct this? eg:All the heading are viewed in left corner NameSkillDesignation suni...
Given a 4x4 matrix, what formula could i apply to each (x,y) cell to yield an (x,y) if the matrix was rotated 90 degrees to the right? I tried iterating over each cell but different cells gave different formulas. Given the following matrix of values. 0| | | | | 1| | | | | 2| | | | | 3| | | | | ------------- ...
Is it possible to optimize this kind of (matrix) algorithm: // | case 1 | case 2 | case 3 | // ------|--------|--------|--------| // | | | | // case a| a1 | a2 | a3 | // | | | | // case b| b1 | b2 | b3 | // | | | | // c...
I am looking for an elegant way to implement this. Basically i have a m x n matrix. Where each cell represents the pixel value, and the rows and columns represent the pixel rows and pixel columns of the image. Since i basically mapped points from a HDF file, along with their corresponding pixel values. We basically have alot of empty p...
When I run the following program with scalefactory higher than 1.5, the program throws an EXC_BAD_ACCESS. The program scales an image. #include <iostream> #include <OpenCV/cv.h> #include <OpenCV/highgui.h> #include <cmath> using namespace std; using namespace cv; int scale (int xyvalue, float scalefactor) { return ceil(xyvalue/sca...
What is a good representation for matrices in Clojure? I'm interested in dealing with dense matrices of floating point numbers. The "list of lists" representation springs to mind, but is there something better? Some criteria for a good representation include: Efficiency: They won't be used for constant processing of huge data sets, bu...