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Advisory messages
+++++++++++++++++
These messages are returned by ``simulate( )``, as in
``message=simulate(until=123)``.
Upon a normal end of a simulation, ``simulate( )`` returns the message:
- **SimPy: Normal exit**. This means that no errors have occurred and
the simulation has run to the time specified by the ``until`` parameter.
The following messages, returned by ``simulate( )``, are produced at a premature
termination of the simulation but allow continuation of the program.
- **SimPy: No more events at time x**. All processes were completed prior
to the *endtime* given in *simulate(until=endtime)*.
- **SimPy: No activities scheduled**. No activities were scheduled
when *simulate( )* was called.
Fatal error messages
++++++++++++++++++++
These messages are generated when SimPy-related fatal exceptions occur.
They end the SimPy program. Fatal SimPy error messages are output to
*sysout*.
- **Fatal SimPy error: activating function which is not a generator (contains no 'yield')**.
A process tried to (re)activate a function which is not a
SimPy process (=Python generator). SimPy processes must contain
at least one *yield . . .* statement.
- **Fatal SimPy error: Simulation not initialized**. The SimPy program
called *simulate( )* before calling *initialize( )*.
- **SimPy: Attempt to schedule event in the past**: A *yield hold* statement
has a negative delay time parameter.
- **SimPy: initialBuffered exceeds capacity**: Attempt to initialize a Store
or Level with more units in the buffer than its capacity allows.
- **SimPy: initialBuffered param of Level negative: x**: Attempt to
initialize a Level with a negative amount x in the buffer.
- **SimPy: Level: wrong type of initialBuffered (parameter=x)**: Attempt to
initialize a buffer with a non-numerical initial buffer content x.
- **SimPy: Level: put parameter not a number**: Attempt to add a
non-numerical amount to a Level's buffer.
- **SimPy: Level: put parameter not positive number**: Attempt to add
a negative number to a Level's amount.
- **SimPy: Level: get parameter not positive number: x**: Attempt to
get a negative amount x from a Level.
- **SimPy: Store: initialBuffered not a list**: Attempt to initialize
a Store with other than a list of items in the buffer.
- **SimPy: Item to put missing in yield put stmt**: A *yield put* was
malformed by not having a parameter for the item(s) to put into the
Store.
- **SimPy: put parameter is not a list**: *yield put* for a Store must
have a parameter which is a list of items to put into the buffer.
- **SimPy: Store: get parameter not positive number: x**: A *yield
get* for a Store had a negative value for the number to get from the
buffer.
- **SimPy: Fatal error: illegal command: yield x**: A *yield*
statement with an undefined command code (first parameter) x was
executed.
Monitor error messages
++++++++++++++++++++++
- **SimPy: No observations for mean**. No observations were made by the
monitor before attempting to calculate the mean.
- **SimPy: No observations for sample variance**. No observations were made by the
monitor before attempting to calculate the sample variance.
- **SimPy: No observations for timeAverage**, No observations
were made by the monitor before attempting to calculate the time-average.
- **SimPy: No elapsed time for timeAverage**. No simulation
time has elapsed before attempting to calculate the time-average.
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