posum.options {posum}R Documentation

Setting posum options

Description

Allows setting of some coefficients in posum.

Usage

posum.options(con.mesh=40,fdi=0.01,n.int=10,m.dint=3)

Arguments

con.mesh the non-negativity constraints will be applied on a con.mesh by con.mesh mesh over the age time plane.
fdi determines the finite difference interval to use when applying constraints or calcualting death rates. Typically an output time/age step is determined and the finite difference interval set to fdi multiplied by this. For example when creating constraints the smaller of the age and time interval of the constraint mesh is taken and multiplied by fdi to get the finite difference interval to use for death rate calcualtions.
n.int How many mesh points to use per stage when integrating under the population surface to set up the model matrix.
m.dint This is a multiplier used to find the integration timestep to use when integrating under the death rate surface. The time step is obtained by dividing the maximum age seen in the data by m.dint*d.int*ns, where ns is the number of stages being modelled. This interval is used as the target timestep, although the actual timestep is chosen so that a whole number of intervals is used for the integration.

Value

A named list of the input arguments.

WARNING

Author(s)

Simon N. Wood snw@st-and.ac.uk

References

http://www.ruwpa.st-and.ac.uk/simon.html

See Also

posum.con, posum, posum.X,


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