# exception.py - exception definitions for the control package

#

# Author: Richard M. Murray

# Date: 31 May 2010

#

# This file contains definitions of standard exceptions for the control package

#

# Copyright (c) 2010 by California Institute of Technology

# All rights reserved.

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions

# are met:

#

# 1. Redistributions of source code must retain the above copyright

# notice, this list of conditions and the following disclaimer.

#

# 2. Redistributions in binary form must reproduce the above copyright

# notice, this list of conditions and the following disclaimer in the

# documentation and/or other materials provided with the distribution.

#

# 3. Neither the name of the California Institute of Technology nor

# the names of its contributors may be used to endorse or promote

# products derived from this software without specific prior

# written permission.

#

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

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#

# $Id$

class ControlSlycot(ImportError):

"""Exception for Slycot import. Used when we can't import a function

from the slycot package"""

pass

class ControlDimension(ValueError):

"""Raised when dimensions of system objects are not correct"""

pass

class ControlArgument(TypeError):

"""Raised when arguments to a function are not correct"""

pass

class ControlMIMONotImplemented(NotImplementedError):

"""Function is not currently implemented for MIMO systems"""

pass

class ControlNotImplemented(NotImplementedError):

"""Functionality is not yet implemented"""

pass

# Utility function to see if slycot is installed

def slycot_check():

try:

import slycot

except:

return False

else:

return True