eigen Questions
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Given a set of 2d points (in Cartesian form), I need to find the minimum-area ellipse such that every point in the set lies either on or inside the ellipse.
I have found the solution in the form o...
Horribly asked 19/6, 2016 at 19:51
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From what I've read about Eigen (here), it seems that operator=() acts as a "barrier" of sorts for lazy evaluation -- e.g. it causes Eigen to stop returning expression templates and actually perfor...
Ezarras asked 6/6, 2016 at 13:22
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I have a MatrixXf variable and a VectorXf variable. I would like to perform a rowwise division using the Vector on my Matrix. Is it possible to do something like this?
#include <iostream>
#i...
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Here is a function I would like to write:
template<typename NumType> using Vec = Eigen::Matrix<NumType, Eigen::Dynamic, 1>;
template<typename T>
void foo(Eigen::Ref<Vec<T...
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This question was asked in haste. The error in my original program, was not the typo in the code that is displayed here. The error was that in my program v was not getting populated due to some con...
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A while back it was a nightmare for me trying to get Eigen up and running on my mac for XCode, but a friend managed to figure it out and shared the instructions with me. I don't want anyone to go t...
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I have learnt how to find inverse of a matrix using Eigen. But when I'm finding inverse of an array that is a output of function I got an error
request for member ‘inverse’ in ‘x’, which is of ...
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I am trying to use dynamic Eigen matrices and vectors with boost::odeint. The reason is that I want to solve a problem defined by user input of arbitrary size. The problem can be captured in a stat...
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Below is the C++ implementation comparing the time taken by Eigen and For Loop to perform matrix-matrix products. The For loop has been optimised to minimise cache misses. The for loop is faster th...
Chilly asked 25/2, 2016 at 7:23
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As part of my pipeline I need to perform eigendecomposition of a big matrix in the order of 6000x6000. The matrix is dense, so except if I simplify the problem (sot sure if possible) no sparse meth...
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I'm using Julia at the moment but I have a performance critical function which requires an enormous amount of repeated matrix operations on small fixed size matrices (3 dimensional or 4 dimensional...
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Is it possible to initialize a static eigen matrix4d in a header file? I want to use it as a global variable.
I'd like to do something along the lines of:
static Eigen::Matrix4d foo = Eigen::Matr...
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Chances are this is a very stupid question but I spent a pretty absurd amount of time looking for it on the documentation, to no avail.
in MATLAB, the find() function gives me an array with the in...
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I tried to write a generic serialize function which takes any dense matrix and serializes it:
Some other questions which help but not to the end are here:
Question1 Question2
I tried the following...
Applegate asked 22/8, 2013 at 13:53
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In Eigen, I can do a row-wise or column-wise "partial reduction" to get the maximum coefficients.
For example, this program:
#include <iostream>
#include <Eigen/Dense>
int main()
{
...
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I'm trying to compute the 2 major principal components from a dataset in C++ with Eigen.
The way I do it at the moment is to normalize the data between [0, 1] and then center the mean. After that ...
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I want to convert a matrix from Eigen::Matrix4f to Eigen::Affine3f
Any one help?
Thanks
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I have a matrix NxM (usually 10k X 10k elements) describing a ground set. Each line represents an object and each column an specific feature. For example, in the matrix
f1 f2 f3
x1 0 4 -1
x2 1 0 ...
Prehistory asked 25/5, 2015 at 22:17
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I have an Eigen::MatrixXd and I need to modify the value of the elements in its diagonal. In particular I have another Eigen::MatrixXd with one single column and the same number of rows of the firs...
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I have two Eigen::MatrixXd and they always have a single row. The input matrix is A and I want to copy this matrix into another matrix B, but the number of columns between the matrices can be diffe...
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I have a matrix, which is given as:
std::vector<std::vector<std::complex<double>>> A;
And I want to map that to the Eigen linear algebra library like this:
Eigen::Map<Eigen...
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This is a rather theoretical question, but I'm quite interested in it and would be glad if someone has some expert knowledge on this which he or she is willing to share.
I have a matrix of floats ...
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I am trying to write a function that accepts only lvalue Eigen expressions passed via const references. My first idea was to keep only the overload const Eigen::MatrixBase<Derived>& and d...
Britzka asked 18/10, 2015 at 18:55
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