simp - rational simplification
[n1,d1]=simp(n,d) calculates two polynomials n1 and d1 such that n1/d1 = n/d .
If N and D are polynomial matrices the calculation is performed element-wise.
H1=simp(H) is also valid (each entry of H is simplified in H1 ).
Caution:
-no threshold is given i.e. simp cannot forces a simplification.
-For linear dynamic systems which include integrator(s) simplification changes the static gain. ( H(0) for continuous systems or H(1) for discrete systems)
-for complex data, simp returns its input(s).
-rational simplification is called after nearly each operations on rationals. It is possible to toggle simplification on or off using simp_mode function.
s=poly(0,'s'); [n,d]=simp((s+1)*(s+2),(s+1)*(s-2)) simp_mode(%F);hns=s/s simp_mode(%T);hns=s/s