caraxis | R Documentation |
A rather simple multibody system, describing the behavior of a car axis on a bumpy road.
It is a differential algebraic equation of index 3
caraxis (times = seq(0, 3, by = 0.01), yini = NULL, dyini = NULL,
parms = list(), printmescd = TRUE, method = mebdfi,
atol=1e-6, rtol=1e-6, ...)
yini |
the initial (state) values for the DE system. If |
dyini |
the initial derivatives of the state variables of the DE system. |
times |
time sequence for which output is wanted; the first
value of |
method |
the solver to use; only |
atol |
absolute error tolerance, either a scalar or a vector, one value for each y. |
rtol |
relative error tolerance, either a scalar or a vector, one value for each y, |
printmescd |
if TRUE the mixed error significant digits computed using the reference solution at time 3 are printed |
parms |
list of parameters that overrule the default parameter values |
... |
additional arguments passed to the solver . |
The default parameters are: eps = 1e-2, M = 10, L = 1, L0 = 0.5, r = 0.1, w = 10, g = 1
A matrix of class deSolve
with up to as many rows as elements in
times
and as many
columns as elements in yini
, plus an additional column (the first)
for the time value.
There will be one row for each element in times
unless the
solver returns with an unrecoverable error. If
yini
has a names attribute, it will be used to label the columns
of the output value.
Karline Soetaert <karline.soetaert@nioz.nl>
Francesca Mazzia <mazzia@dm.uniba.it>
url : archimede.dm.uniba.it/~testset
out <- caraxis()
plot(out, lwd = 2, mfrow = c(3, 4))
# compare with reference solution
out[nrow(out),2:11]-reference("caraxis")
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