A model is constructed by wiring one component to another in a way
that defines an equation. Wires are drawn from the output port of
one block to the input port of another. Ports are circles on the blocks
to which wires can be attached, which can be seen when hovering the
pointer over the block. Variables have an input and an output port;
constants and parameters only have an output port. A mathematical
operator has as many input ports as are needed to define the operation.
Some operators can be ``overloaded''—more than one input can
be attached to an input port. Thus you can add more than two variables
using the
block, simply by wiring more
than one variable to each input port. The same applies to the subtraction
block
, division
,
minimum
and maximum
blocks.