search for: daspk

Vince, When that happens, one possible reason is that your DAE is of index > 1, which cannot be solved by daspk. The solver radau, also from deSolve can handle DAEs up to index 3, but you need to rewrite the problem in the form M*y' = f(x,y), where M is a mass matrix. If you do that for your problem, and solve it with radau, then radau complains that the "matrix is repeatedly singular", the...

...So-S -ES -P return(list(c(res1, res2, eq1, eq2))) }) } pars <- c(Eo=0.02, So=0.02, k2=250, E=0.01); pars yini <- c(S=0.01, ES = 0.01, P=0.0, E=0.01); yini times <- seq(0, 0.01, by = 0.0001); times dyini = c(dS=0.0, dES=0.0, dP=0.0) ## Tabular output check of matrix output DAE <- daspk(y = yini, dy = dyini, times = times, res = Res_DAE, parms = pars, atol = 1e-10, rtol = 1e-10) ERROR: daspk-- warning.. At T(=R1) and stepsize H (=R2) the nonlinear solver f nonlinear solver failed to converge repeatedly of with abs (H) = H repeatedly of with abs (H) = HMIN...

Dear All, I like to simulate a physiologically based pharmacokinetics model using R but am having a problem with the daspk routine. The same problem has been implemented in Berkeley madonna and Winbugs so that I know that it is working. However, with daspk it is not, and the numbers are everywhere! Please see the following and let me know if I am missing something... Thanks a lot in advance, In-Sun #---------------...

Le Sat, Nov 18, 2017 at 03:26:53PM -0800, Bill Harris a ?crit : > Incidentally, you can see a bit more complete description at > https://unix.stackexchange.com/questions/402560/how-do-i-install-r-on-debian-stretch-given-the-r-api-3-issue > . Hi Bill and everybody, if one installs R >= 3.4.2 from any source, then some Debian packages will be broken. The change of r-api virtual