I found this piece of C++ code on a forum that I can't fully understand. Since I don't have their library that performs matrix/vector math, I need to manually figure it out and replicate the functionality. Calculate Euler rotation angles between 2 vectors .. we use Rodrigues formula vector $V1 = << my first vector >>; vector $V...
First of all, I'm looking at the interactions between around 300 elements. Each element will interact with all others and itself. In a minority of these cases, a reaction will occur, and I will mark that reaction. Since this is basically a matrix with around 90,000 possible interactions, I want to manage this data with code so I can e...
I'm writing my own 3D engine and I have this matrix to make a perspective look. (It's a standard matrix so there is nothing interesting) public static Matrix3D PrespectiveFromHV(double fieldOfViewY, double aspectRatio, double zNearPlane, double zFarPlane, double mod) { double height = 1.0 / Math.Tan(fieldOfViewY / 2.0); ...
I am trying to develope an app on canvas ,i am drawing a bitmap on canvas with the help of canvas.drawBitmap().After that i want to convert that canvas into bitmap. can anyone give me suggession thanking you in advance ...
I have a 3-d matrix with the following dimensions 6-2-10. I want the row dimension to switch places with the heigh dimension, ie 10-2-6. Reshape doesn't achieve this the way I want. How can this be done? Can I rotate the matrix? ...
Hello, I have a matrix containing 4320 entries for example: P=[ 26 29 31 33 35 26 29 ..........25] I want to create 180 matrices and every matrix contains 24 entries,i.e the 1st matrix contains the 1st 24 entries the 2nd matrix contains the 2nd 24 entries and so on I know a simple method but it will take a long time which is: P1=...
Hello, How to implement in c++ the operator() and operator* (multiplication) for this Matrix class? class matrix { static const int MAX_SIZE=100; T operator()(int, r, int c) const; matrix& operator*(const matrix& N) const; private: int r_, n_; struct elem{ T content; int row, col; elem* next_row; elem* next_co...
Hello there, Flash Tranformation Matrix via JsFL are mean to me :( I have to write a JsFL script that creates a text on my Flash scene, and rotate it with a random angle. Imagine I want to create and rotate a "Hello World!" at 45 degrees, my code looks like that : rotateAngle = 45; //creates my new text at x:0, y:0 coordinates fl...
Hello! I'm doing a program that reads from a text file in order to determine the size of the matrix (rows and cols) and respective content of the matrix. I was wondering if something like: int main() { int rows = FunctionThatReadsRows(); int cols = FunctionThatReadsCols(); int matrx[rows][cols]; return 0; } Would work? Or does it nee...
Hello Imagine I've got 100 numeric matrixes with 5 columns each. I keep the names of that matrixes in a vector or list: Mat <- c("GON1EU", "GON2EU", "GON3EU", "NEW4", ....) I also have a vector of coefficients "coef", coef <- c(1, 2, 2, 1, ...) And I want to calculate a resulting vector in this way: coef[1]*GON1EU[,1]+coef[2]*GON...
Hello! Does someone know a fast way to add the ability to rotate and move a 3D model using Qt? Obviously, I have to make changes to the world matrix based on the mouse and keyboard movements, and hence I should somehow handle the appropriate mouseEvents and keyboardEvens. For a 3d camera this seems a bit tricky and although I could im...
Hello, everyone! I am trying to create a 2d matrix so that each cell contains a list of strings. Matrix dimensions are known before the creation and I need to have access to any element from the beginning (not populating a matrix dynamically). => I think some kind of preallocation of space is needed. For example, I would like to have a...
Hi, this was asked to me in one of my job interviews - M is a 2d n-by-n matrix in which every row and every column is sorted are all elements are different. I need an O(n) algorithm - Given indices i, j, i0, j0 as input, compute the number of elements of M smaller than M[i, j] and larger than M[i0, j0]. I tried various approaches for t...
Hi, I have huge data matrices stored in a MATLAB M-file and I will explain my problem by this sample example: I have three constant matrices (every matrix has its own values and these values are not changed, they are values for experiment results) Every matrix always has 4 rows and 6 columns The last column of the 1st matrix is a z...