MATLAB Mathematics - SERC - Index of

Boundary Value Problems for ODEs
sol.yp Approximation to y′ ( x)
at the mesh points of sol.x
sol.solver
'bvp4c'
The structure sol returned by bvp4c contains an additional field if the problem
involves unknown parameters:
sol.parameters
Value of unknown parameters, if present, found by the
solver.
The function deval uses the output structure sol to evaluate the numerical
solution at any point from [a,b]. For information about using deval, see
“Evaluating the Solution at Specific Points” on page 5-56.
BVP Solver Options
For more advanced applications, you can specify solver options by passing an
input argument options.
options
Structure of optional parameters that change the default
integration properties. This is the fourth input argument.
sol = bvp4c(odefun,bcfun,solinit,options)
You can create the structure options using the function bvpset.
The bvpset reference page describes the properties you can
specify.
Changing BVP Integration Properties
The default integration properties in the BVP solver bvp4c are selected to
handle common problems. In some cases, you can improve solver performance
by overriding these defaults. You do this by supplying bvp4c with an options
structure that specifies one or more property values.
For example, to change the value of the relative error tolerance of bvp4c from
the default value of 1e-3 to 1e-4,
1 Create an options structure using the function bvpset by entering
options = bvpset('RelTol', 1e-4);
5-67