====== Definition of a Material ======

A material is defined with the lines:

  materialno = materialset.define (number, type)
  materialno = materialset(number)
  materialno.put(param, value)
  materialno.depend(param, fct, Key(Lock)))
  ...

|''number'' | number of the material (must be unique) |
|''type'' | type of material (for example ''EvpIsoHHypoMaterial'') - see [[doc:user:start#Materials]] |
|''param'' | code of the material parameter (for example ''MASS_DENSITY'', or number of an evolution law such as ''YIELD_NUM'', see [[doc:user:elements:volumes:start]]) |
|''value'' | value of the corresponding material parameter |
|''fct'' | function which characterizes the dependency of the property (optional: no ''fct'' if no dependency) |
|''Lock'' | [[doc:user:general:locks|Lock]] which defines the dependency variable of the property (compulsory if there is a dependency) |