search for: kutta

I am an initial user of R. Could you give me some explanations or examples on how to solve the first order differential equations by the first-order Runge-Kutta method? Thank you very much Kind regards

Hello, I have downloaded the rmutil package in the form of *.tar.gz compressed file (I would like to use the runge-kutta() function). The package rmutil does not appear in the list of available packages. Can any one help? Massoud Boroujerdi PhD [[alternative HTML version deleted]]

Hello, I want to know if there are some functions or packages to solve differential and integral equation using R. Thanks. Shao chunxuan. [[alternative HTML version deleted]]

I have own function wrote. I used an algorithm, which was written in Matlab. in matlab: ... gamma = inv(v)*g; ... #v = matrix of variable size, v=vv(k) => k=2 => dimension of v 2x2 #g = a line vector with 4 elements e.g. g=[1,0,2,0]; my rewritten r-file: ... gamma = solve(v)*g; ... which is my error? Who can help me? thank you in advance. Chris -- Lust, ein paar Euro nebenbei zu

...s (IVP) of: - ordinary differential equations (ODE), - differential algebraic equations (DAE) and - partial differential equations (PDE). The implementation includes stiff integration routines based on the ODEPACK Fortran codes (Hindmarsh 1983). It also contains fixed and adaptive time step Runge-Kutta solvers and the Euler method. Main improvements: - new introductory tutorial (vignette) "Solving initial value differential equations in R", - all integrators are now implemented in compiled languages (Fortran resp. C). Now all solvers allow to call compiled models directly (see packa...

Hello! I would like to know if R can solve Differential Equations... I don't think so because, in my point, I see R like a Statistical System, not a Math System. Am I wrong? Thank you very much. M??rcio de Medeiros Ribeiro Graduando em Ci??ncia da Computa????o Departamento de Tecnologia da Informa????o - TCI Universidade Federal de Alagoas - UFAL Macei?? - Alagoas - Brasil Projeto CoCADa

...s (IVP) of: - ordinary differential equations (ODE), - differential algebraic equations (DAE) and - partial differential equations (PDE). The implementation includes stiff integration routines based on the ODEPACK Fortran codes (Hindmarsh 1983). It also contains fixed and adaptive time step Runge-Kutta solvers and the Euler method. Main improvements: - new introductory tutorial (vignette) "Solving initial value differential equations in R", - all integrators are now implemented in compiled languages (Fortran resp. C). Now all solvers allow to call compiled models directly (see packa...

Hello veryone, I am interested in the diffusion of particles inside a sphere, and its release through a small pore on the sphere surface. Unfortunately, I have not found the way to do this in R. Could you help me? Thank very much in advance for your help

...,120,140,160,180) G_b <- 100 I_b <- 5.8 parms <- c(p1=0.012584, p2=0.037708, p3=0.000012524) xstart <- c(G=273.92,X=0) sim.data <- as.data.frame(rk4(y=xstart, time=time, func=minmod, parms=parms)) # note: i use rk4 because the standard software for estimating this model uses a Runge-Kutta approach sim.data$noisy <- sim.data$G + rnorm(nrow(sim.data), mean=0, sd=0.01*sim.data$G) ###### estimation Weight <- c(0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1) xstart.est <- c(G=mean(sim.data$noisy[1:4]), X=0) # inital fit of nls fit.rk4 <- nls(noisy ~ rk4(xstart.est,...

...egration (m) Numerical differentiation - Fourier transf. (1D / 2D /multidim.) +/+/- Inverse Fourier transformation (1D / 2D / multidim.) +/+/- 2.4 Numerical Mathematics - Classical Interpolation + k-Spline Interpolation ? B-Spline Interpolation ? Newton method for finding roots + Bisection - Runge Kutta method for solving ODE - 2.5 Stochastic Markov models - Mean + Median + Mode - Variance + Beta Distribution + + + Chi-Squared Distribution + + + Gamma Distribution + + + Log-Normal Normal Distribution + + + Poisson Distribution + + + Uniform Distribution + + + More Distribution 2.6 Statistics Lin...

At ORNL, we worked with VisIt (a sibling of Paraview, both funded largely by DOE) around 2016 and made an in situ demo with R. We used packages pbdMPI (on CRAN) and pbdDMAT (on GitHub/RbigData), which were in part built for this purpose. Later also the package hola (on GitHub/RbigData) was built to connect with adios2, which can do buffered in situ connections with various codes. But the VisIt