The Polynomial Toolbox for MATLAB - DCE FEL ČVUT v Praze

Changing the
default
indeterminate
variable
P =
2
To free the variable simply type
clear s;
P = 1+s^2
P =
1 + s^2
After the Polynomial Toolbox has been started up the default indeterminate variable
is s. This implies, among other things, that the command
P = pol([P0 P1 P2],2)
returns a polynomial matrix
P =
1 + 3s + s^2 2 + 4s
3 + 5s 4 + s + s^2
in the indeterminate s. The indeterminate variable may be changed with the help of
the gprops command: typing
gprops p; pol([P0 P1 P2],2)
for instance, results in
ans =
1 + 3p + p^2 2 + 4p
3 + 5p 4 + p + p^2
To enter data independently on the current default indeterminate variable, one can
use a shortcut v: The indeterminate variable v is automatically replaced by the
current default indeterminate variable. Thus, after the default indeterminate
variable has been set to p by the command
then
gprops p
V = 1+v^2+3*v^3
returns
V =
1 + p^2 + 3p^3