Formal representations and conversions

• abcd — state-space matrices
• cont_frm — transfer to controllable state-space
• dbphi — frequency response to phase and magnitude representation
• des2ss — descriptor to state-space
• des2tf — descriptor to transfer function conversion
• frep2tf — transfer function realization from frequency response
• lsslist — Scilab linear state space function definition
• markp2ss — Markov parameters to state-space
• sm2des — system matrix to descriptor
• sm2ss — system matrix to state-space
• ss2des — (polynomial) state-space to descriptor form
• ss2ss — state-space to state-space conversion, feedback, injection
• ss2tf — conversion from state-space to transfer function
• tf2des — transfer function to descriptor
• tf2ss — transfer to state-space