### Python (NumPy, SciPy), finding the null space of a matrix

I'm trying to find the null space (solution space of Ax=0) of a given matrix. I've found two examples, but I can't seem to get either to work. Moreover, I can't understand what they're doing to...

### Lock-Free Queue with boost::atomic - Am I doing this right?

Short version: I'm trying to replace std::atomic from C++11 used in a lock-free, single producer, single consumer queue implementation from here. How do I replace this with boost::atomic? Long...

### Double free or corruption at end of program with no free's

My program is completing and even printing the final "DONE2" just before return 0; in main. I have dynamic memory allocation with malloc but I have no free's in my program. Why/how can I get this...

### Eliminate redundant equations from linear system

I have 1 or more equations and 3 unknowns. I want to reduce it to the minimum number of equations possible. There can be either 0, 1 or infinitely many solutions. In the 0 solution case I don't...

### Making a augmented matrix in matlab, and reduced row echelon form

Is it possible to combine matrix A and matrix b to make an augmented matrix [A|b], where b is the solution to matrix A and such that a vertical bar is shown in the output on matlab?If so, is it...

### Finding an optimal solution to a system of linear equations in c++

Here's the problem: I am currently trying to create a control system which is required to find a solution to a series of complex linear equations without a unique solution. My problem arises...

### Alternate way to do Iterative name/variables in Pythonic while loop

So I know that it is a kind of pythonic heresy to modify a variable name while iterating over it but I have been searching for a good pythonic way to do this and can figure it out. In statistical...

### Find all solutions of row reduced echelon matrix in pure python

I have toggle = [[1, 1, 1, 1, 0, 0, 1, 0, 0], [0, 1, 1, 0, 1, 1, 0, 0, 0], [0, 0, 1, 1, 0, 0, 0, 1, 0], [0, 0, 0, 1, 1, 0, 1, 1, 0], [0, 0,...

### Converting a loop from Matlab to C

I have a (3x5) matrix and I want to get its reduced row echelon form. I want to implement it in C, so I first impelemnted it in Matlab like follows: [L,U]=lu(a); [m,n]=size(U); disp('convert...

### AngularJS ng-repeat with external image source not updating view with images

I've run into an issue building a new website where I'm pulling a get request from an external API that contains an image "ID". This image ID can be accessed by going to...

### calculating the eigenvector from a complex eigenvalue in opencv

I am trying to calculate the eigenvector of a 4x4 matrix in opencv. For this I first calculate the eigenvalue according to this formula: Det( A - lambda * identity matrix ) = 0 From wiki on...

### Finding an answer to a singular matrix equation if it exists in SymPy

Suppose we have the matrix equation A*x = b where A is square but singular. Then in general the equation either has no solutions or infinitely many solutions. If it does have solutions, I'd like...

### How to compute total floating-point rounding error of a set of arithmetic computations in java using Math.ulp(double)?

I want to calculate the floating-point rounding error of a series of additions, multiplications, and divisions using the Math.ulp(double) method in Java. According to the wiki page on Unit in the...

### Python - Get steps needed to convert matrix to RREF

I have the following problem: I have two binary matrices, that might look like this: | 1 | 0 | 1 | 0 | 0 | 1 | | 1 | 0 | 0 | 0 | 0 | 0 | | 0 | 1 | 1 | 1 | 0 | 1 | | 0 | 1 | 0 |...

### Notice: Trying to get property of non-object in /var/www/html/ech/user/actions/punish.php on line 24

So I have a game server and I'm writing a php script called Echelon that allows me to interact with my gameservers database to view all information about the players etc, I'm trying to write a...

### rref vs. LU solving complexity

I was running a 'sanity test' today by comparing the run times of two elementary ways to solve Ax = b where A is square and b is a column vector: A = rand(1000,1000); b = rand(1000,1); Xmat =...

### Deprecated Warning: Why won't my Matrix print?

So I am doing a little project for my linear algebra class and I wanted to make a program that could construct an i by j matrix and then do a Row Echelon form-esque algorithm. But before any of...

### Numerical Optimization of PL/SQL, or alternatives

We have a requirement to do some computational heavy lifting to connect with an Oracle database. Up until now, we have performed our numerical calculations in PL/SQL and largely put up with the...

### Row reduce of a matrix mod 2

So I have two matrices, E and I I stack them together horizontally and perform a different kind of row reduce than the one we know (Echelon). In this row reduce, starting with the first column on...

### Too many arguments in __init__

I am currently coding a platformer game with help from the videos 'kidscancode' on youtube. It has all gone well up to this point, where I recieve the following error: Traceback (most recent call...

### C-Making a Matrix in Echelon Form?

Hey, so I wanted to make a program for making a Matrix in Echelon form(Not Reduced Echelon Form). Everything seems to be working fine except when the last element of the matrix is 0. That time,...

### Order of imported css file in component - vuejs

So I have the main.js for the main entry point of my app and I import an app.scss. It holds my global css like bootstrap, font-awesome and etc. /* Vue */ import Vue from 'vue' import router from...

### R language: How to solve matrix for unknown constant

Using R: How do I enter an unknown constant 'h' in an augmented matrix so R can calculate the Reduced Row-Echelon Form? i.e. to find the value h that makes the augmented matrix consistent. | 1 h ...

### How to obtain reduced echelon for large matrix

I have a large 2000 x 3000 matrix where the final operation is to compute the reduced row exchelon form so that the matrix entries are simpler. eg for a small matrix we might start with (example...

### Gaussian Elimination Parallelism

I have sucessfully implemented a single threaded program in CUDA for Gaussian elimination and would like to achieve parallelism. Up to this point the parallel code looks like: __global__ void...

### Visual Cron and Windows task scheduler executing a powershell script with unexpected results

I will preface this by saying I am not really the in the top echelon of programming, be it powershell or others, so please understand my code works to do what I need. Or it was until earlier this...

### How to implement a function that checks if the system is consistent or not?

inconsistency in python. I'm trying to implement a function for gaussian elimination. This function should test if the matrix is inconsisten or consistent. We assume that the input is in echelon...

### Access WebMail(i.e:"Mail.com") Emails Over Basic HTML Version WebSite From Basic/TB WebBrowser

QUESTION(s) : (1) How can users or I have direct-access (aka: view, send, receive, etc capabilities) forÂ  web-emails/web-mails (i.e:"Mail.com") , fromÂ  simple/basic/lightweight/mobileÂ ...

### Matrix reduction to echelon form exercise using Python

I'm defining variables to convert a given matrix to its echelon form, the exercise ask me to define different variables to check whether a matrix is singular or not, and to convert it to its...

### Matrix (arrays) in Lua - swap rows and apply row operation

I have this code --[[ Gaussian Elimination in Lua --]] -- print matrix function printmatrix(m) for r=1,#m do for c=1,#m[r] do io.write(m[r][c]) if c < #m[r] then...