A Boost C++ library directed towards scientific computing on the level of basic linear algebra constructions with matrices and vectors and their corresponding abstract operations.
Questions tagged [boost-ublas]
50 questions
1
vote
1 answer
Using boost's LU-solver but avoid computing a matrix inverse?
I am solving system of linear equations in C++ using the LU decomposition as provided by Boost.
static void boostLU(const boost::numeric::ublas::matrix &A, const boost::numeric::ublas::matrix &y)
{
…
bogus
- 867
- 6
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1
vote
1 answer
How to adapt a boost::property_map in order to use it like a ublas::vector?
I am looking for a smart way to use the Boost Graph Library in conjunction with Boost uBLAS. More precisely, I need to update a given vertex property for each vertex by using the result of the scalar product between the graphs adjacency matrix and a…
mtd
- 123
- 7
1
vote
0 answers
How to perform an operation on a subset of elements in a Boost::uBlas::vector?
Suppose you have a long boost::numeric::ublas::vector and you want to perform an update operation on a subset of the elements. How many of the elements should be updated is somewhere between "all" or "none".
Which elements to update is given by a…
user20948
- 11
- 1
1
vote
0 answers
Boost matrix product for multiprecision numbers
I am trying to implement some high precision calculations in C++ using Boost.Multiprecision and Boost.uBLAS, in VS 2010 Express. However even in the simplest case my code fails to compile, giving the following error:
error C2677: binary '+=' : no…
daimoz
- 11
- 2
0
votes
2 answers
boost, matrix_proxy, const matrix
Giving this:
void foo(const matrix& lol)
{
matrix_row > lolwut(lol, 5);
}
error:
no matching function for call to ‘boost::numeric::ublas::matrix_row >::matrix_row(const…
Evgeny P. Kurbatov
- 183
- 3
- 8
0
votes
1 answer
Solving (dense) linear system Ax=b using boost
I have a dense system of equations of type Ax=b to solve in my C++ program, and I was hoping to implement the solution using UBLAS in boost. In some other questions I found that people were using the extension LAPACK, but unfortunately it doesn't…
Grzenio
- 35,875
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0
votes
1 answer
Use of vector_expression directly in Boost.uBLAS
We have a performance issue where an expression is first translated to a Boost.uBLAS vector and then evaluated. It makes a difference if the vector creation could be skipped and that the vector_expression is used directly. I couldn't find in the…
gast128
- 1,223
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0
votes
1 answer
What is wrong with passing a function that returns a vector by value as argument of ublas::element_prod()?
I cannot seem to understand why passing directly a function as argument to ublas::element_prod() produces a wrong result.
If I run the following code:
#include
#include
#include…
Michele Petracca
- 11
- 2
0
votes
2 answers
typedef a vector and boost::numeric::ublas::vector of fixed size
I mean to typedef a name for a vector / boost vector with fixed size, and then for corresponding iterators.
What I could do is (see below)
typedef std::array point_3d_array;
typedef point_3d_array::iterator point_3d_iterator;
typedef…
sancho.s ReinstateMonicaCellio
- 14,708
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- 185
0
votes
1 answer
Disable warning log in boost::ublas
While inverting a matrix with boost::ublas I sometimes get this error in the log:
Check failed in file /usr/include/boost/numeric/ublas/lu.hpp at line
298: detail::expression_type_check (prod
(triangular_adaptor (m), e), cm2)
I am aware this…
user2891462
- 3,033
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- 60
0
votes
1 answer
Program takes (a lot) longer than it should due to a function call that never runs
I'm currently running Bayesian Optimization, written in c++. I use a toolbox call Bayesopt from Ruben Martinez-Cantin (http://rmcantin.bitbucket.org/html/). I'm doing my thesis about Bayesian Optimization…
Ze Nog
- 13
- 2
0
votes
1 answer
How to create a nonempty boost ublas::vector inside an initializer list?
I'm trying to do something like this
#include
using namespace boost::numeric::ublas;
class A{
protected:
vector< double > a_;
public:
A( vector< double > a ) :
a_( a ) {};
};
class B : public A{
…
Gregor de Cillia
- 7,397
- 1
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- 43
0
votes
1 answer
How to multiply a Boost uBLAS vector of doubles with a complex double factor?
Is it possible to calculate the elementwise product of an uBLAS vector of doubles with a complex double? The following code fails to compile since it can not find an overloaded operator *. I would expect it to work since multiplying a double with a…
Ton van den Heuvel
- 10,157
- 6
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- 82
0
votes
0 answers
Efficient implementation of Element product of Ublas Matrix
makemake I benchmarked the default function for element by element product of Boost Ublas Matrix and found that element_prod was way slower than if I wrote my own implementation with simple for loops. So, I decided to write my own version.
I am…
The Vivandiere
- 3,059
- 3
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- 50
0
votes
2 answers
Boost Vector size constructor not working
When I compile the following code:
#include
#include
namespace ublas = boost::numeric::ublas;
class Point {
ublas::vector v(3);
}
I get this error below complaining about the…
Max Rahm
- 684
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