It may contain Pascal instructions, functions and
procedures, GLIDER common instructions and procedures, GLIDER
functions, the GLIDER instruction CREATE, and the procedures
RETARD and METHOD (see
7.18 and 7.13).
It accepts successions of instructions of the form
<variable>' := <expression>.
These may be mixed with other type of instructions.
The system considers a series of such instructions of the
above type without other type of instructions among them
as a system of differential equations. So, various differential systems
can be represented in a unique node separated by
ordinary instructions. The systems of the same node share a common
METHOD and path of integration. In different C type nodes the METHOD
and path of integration may be different.
In the above instruction <variable> is a variable that was
declared of CONT (continuous) type. It may have a numerical index.
If the variable TIME appears in some equation, it must be represented
by this name. If the value is transferred to other variable, then
both will differ without knowledge of the user, because the
solving algorithm changes the variable TIME without updating
the user's variable.