Questions tagged [c++]

A powerful object oriented programming language.

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Good C, C++ library for efficient grid search / tuples, ideally with bindings to Eigen

I have a $q$-dimensional grid, known at run, not compile-time, that has $50$ points in each direction and hence $50^3$ combinations that I would like to first build and then call a function with each ...
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1answer
175 views

Looking for a converter of AMPL/GAMS models into C code

I've done an extensive web search, but could not find an option. Conversion between model formats is available, but conversion of objective function and constraint equations into C code seems absent. ...
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1answer
64 views

Wanting an explanation of the variables in Iterative PCA algorithm

I've been trying to implement the CPU GS-PCA algorithm in this paper . The code starts on page 28 I have a program written a script in python which gives the same output as the C++ program in the ...
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226 views

How to do a Generalized Complex Schur (or QZ) Decomposition with Eigen C++? [closed]

I would like to do a Generalized Schur (or QZ) decomposition for a pair of complex matrices $A$ and $B$. I found the following class: ...
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1answer
54 views

Passing in a vector from this particular matrix class floating around online [closed]

I am using this matrix class here to assist me in converting this Least Squares algorithm that prices American options that is written in Matlab in C++. My question is pretty simple. I want to pass in ...
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1answer
1k views

two level iterators C++ [closed]

I am trying to implement a two level iterator as I will now describe. Basically I have a "vector of vectors" and I want a single iterator that will loop over all the objects in the vector of vectors. ...
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2answers
142 views

Adaptive numerical integration of a univariate vector integrand

Background & Problem formulation I'm trying to write a simple program in C++ that performs adaptive numerical integration of vector valued integrands (in one variable), i.e. $$\int_a^b \bar{f}(...
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1answer
1k views

Fastest way to diagonalize square matrices with c++

I am currently writing software in c++ which solves the eigenvalue problem of sparse hermitian matrices. The size of the matrix depends on the user input, but as an estimation it will roughly be ...
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1answer
367 views

Debugging in parallel mode using Netbeans

I want to debug a c++ code with Netbeans. I can use the debugger in sequential mode but I dont know how to debug it when I want to run it in parallel. I would be grateful if anyone help me on this ...
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1answer
451 views

Fastest linear solver for sparse positive semidefinite, striclty diagonally dominant matrix

What is the state of the art for fastest linear solver for sparse, positive semi definite and strictly diagonally dominant matrix with N varies from ~700 to ~3000, and about a 1/16 of the matrix is ...
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2answers
3k views

Most efficient library to diagonalize exactly large hermitian or unitary matrices

I am working on a physics problem which requires obtaining the exact eigenvalues and eigenvectors of Hermitian and Unitary matrices numerically. Naturally I would like to ask the experts what are the ...
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1answer
7k views

Vertical and horizontal segments intersection (Line Sweep)

Introduction: I have a vertical segment S That i want to move across a plane (Left --> Right), and find intersections with horizontal lines. Problem : The problem which i am having is the following:...
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43 views

Triplet optimization algorithm producing weird results?

I wrote an algorithm for data analysis using the CERN ROOT framework. It takes in three files of sorted UNIX timestamps from a single year and pairs them up in the closest triplets, where each file ...
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1answer
61 views

Extracting data from VTK simulations using C++

I have been given a few numerical simulations regarding fluid mixing and have been asked to extract a few parameters from them using C++. Altogether there are about 1000 VTK files per simulation, and ...
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0answers
62 views

Calculating the exponential of a complex matrix

I am trying to calculate the exponent of a 3 x 3 matrix using the formula $\sum_{i=0}^\infty\frac {A^n}{n!}$ I believe that my error may lay in the scalar division with a factorial or the member ...
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145 views

Ising model simulation offset critical temperature and interal ernergy

I'm writing a code for the Ising model using WHAM (the weighted histogram analysis method),But it seems to produce critical temperature and internal energy wrong. (newest rewritten code is below) <...
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79 views

How to read data from simply formatted text file (c++)?

Mesh information like points, faces and cells is to be stored into separate files: e.g. for points file: # points data: x y z N_Points 100 x1 y1 z1 x2 y2 z2 ... cell file: # cells data: ...
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1answer
29 views

combinatory exploration c++ [closed]

I have n spots with 2 possible positions each. I would like to explore all of this possibilities in C++ using loops (or something else if there is a better option). I was thinking of looping from 0 ...
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1answer
143 views

How to give a simple estimation of errors for results obtained from 4th order Runge-Kutta

This question is a follow up of another one I have asked a while ago. I have successfully implemented my problem using odeint library and I get the results I expect. However I would like to give an ...
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1answer
1k views

Domain Decomposition with PETSc

Does anyone have any experience on Domain Decomposition using PETSc library? I have used PETSc for creating my vectors and matrix within my C++ code. I also used KSP to solve the linear system. I ...
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166 views

Permissive Math Library for Parameter Statistics in C++

I am looking for recommendations for a C++ math library, with a permissive licence, well suited to calculating a wide variety of statistics on segmentations of timebased parameter data. I would be ...
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2answers
220 views

$LU$ factorization

Our task is to implement a factorization routine that given A in a suitably efficient data structure returns the factors $L$ and $U$ where $L$ is unit lower triangular and $U$ is upper triangular. In ...
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1answer
785 views

Understanding and implementing the Fast Fourier Transform

I need to write the fast fourier transform in C++ and I am referring to this formula from wikipedia: But for some reason I am not getting the correct output when I simply enter (1,1) (1,1) (1,1) (1,...
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1answer
5k views

C++ - Expression must be modifiable lvalue [closed]

I am new to C++. I am trying to set up a very basic TCG game (with only minion with no text). I think my issue might be linked with pointer. Below are the functions and attributes: ...
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1answer
2k views

How to implement Lagrangian/Polynomial Interpolation for my C++ Code?

I have a working C++ function: ...
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1answer
264 views

How to solve this differential equation using RK4 in C++?

I have been given the following homework question to solve: I am having trouble writing a RK4 solver in C++ for this ODE. I am also not sure how to plot my solution. Here is my code so far: ...
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1answer
329 views

Solving electron density function for Hydrogen and drawing in 3D

I recently stumbled upon interesting site that has interactive 3D representation of radial electron distribution (atomic orbital). here is the url: http://winter.group.shef.ac.uk/orbitron/AOs/1s/e-...

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