is.fpt.density  R Documentation 
is.fpt.density
tests if its argument is an object of class “fpt.density”.
is.fpt.density(obj)
obj 
an R object to be tested. 
is.fpt.density
returns TRUE
or FALSE
depending on whether its argument is an object of class “fpt.density” or not.
An object of class “fpt.density” is a threecomponent list:
x 
a sequence of suitable time instants in 
y 
the approximate f.p.t. density function values on the x sequence for the unconditioned or conditioned problem at hand. 
y.x0 
NULL for a conditioned f.p.t. problem or a matrix with the values, by columns, of the approximate f.p.t. densities conditioned to each considered value

It also includes six additional attributes. For more details, see the values of Approx.cfpt.density
and Approx.fpt.density
functions.
Patricia RománRomán, Juan J. SerranoPérez and Francisco TorresRuiz.
P. RománRomán, J.J. SerranoPérez, F. TorresRuiz. (2012) An R package for an efficient approximation of firstpassagetime densities for diffusion processes based on the FPTL function. Applied Mathematics and Computation, 218, 8408–8428.
P. RománRomán, J.J. SerranoPérez, F. TorresRuiz. (2014) More general problems on firstpassage times for diffusion processes: A new version of the fptdApprox R package. Applied Mathematics and Computation, 244, 432–446.
## Testing fpt.density objects
## Continuing the Approx.cfpt.density example:
is.fpt.density(yyy)
## Continuing the Approx.fpt.density example:
is.fpt.density(yyy.cp)
## Not run:
is.fpt.density(yyy.ucp)
## End(Not run)
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