 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...