1> [theta, rho] = cart2pol(-1,-1)
theta = -2.3562
rho =  1.4142


2> % theta in  gradi


2> theta * 180/pi
ans = -135


3> cart2pol(-1,-1)
ans = -2.3562


4> function [thetag, rho] = cart2polg(x, y)
> % cart2polg fa la conversione in coordinate polari con theta in gradi
> [theta, rho] = cart2pol(x,y);
> thetag = theta * 180/pi; % conversione da radianti in gradi
> end;


5> [a, b] = cart2polg(-1,-1)
a = -135
b =  1.4142


6> [x, y] = pol2cart(-3/(4*pi), sqrt(2))
x =  1.3741
y = -0.33442


7> help pol2cart
`pol2cart' is a function from the file C:\Programmi\3.2.4_gcc-4.4.0\share\octave\3.2.4\m\general\pol2cart.m

 -- Function File: [X, Y] = pol2cart (THETA, R)
 -- Function File: [X, Y, Z] = pol2cart (THETA, R, Z)
     Transform polar or cylindrical to Cartesian coordinates.  THETA, R
     (and Z) must be the same shape, or scalar.  THETA describes the
     angle relative to the positive x-axis.  R is the distance to the
     z-axis (0, 0, z).

     See also: cart2pol, cart2sph, sph2cart



Additional help for built-in functions and operators is
available in the on-line version of the manual.  Use the command
`doc <topic>' to search the manual index.

Help and information about Octave is also available on the WWW
at http://www.octave.org and via the help@octave.org
mailing list.


8> [x, y] = pol2cart(-3/4*pi, sqrt(2))
x = -1
y = -1.0000


9> help cart2sph
`cart2sph' is a function from the file C:\Programmi\3.2.4_gcc-4.4.0\share\octave\3.2.4\m\general\cart2sph.m

 -- Function File: [THETA, PHI, R] = cart2sph (X, Y, Z)
     Transform Cartesian to spherical coordinates.  X, Y and Z must be
     the same shape, or scalar.  THETA describes the angle relative to
     the positive x-axis.  PHI is the angle relative to the xy-plane.
     R is the distance to the origin (0, 0, 0).

     See also: pol2cart, cart2pol, sph2cart



Additional help for built-in functions and operators is
available in the on-line version of the manual.  Use the command
`doc <topic>' to search the manual index.

Help and information about Octave is also available on the WWW
at http://www.octave.org and via the help@octave.org
mailing list.


10> z1 = 1 * i; z2 = 4 + 2i; z3 = 6 + 8i;


11> triangolo = [z1 z2 z3 z1];


12> z1 = 1 + i; z2 = 4 + 2i; z3 = 6 + 8i;


13> triangolo = [z1 z2 z3 z1];


14> plot(triangolo);


15> axis equal;


16> hold on;


17> z = 0.5*(sqrt(3)/2+i/2);


18> plot(triangolo*z, 'r');


19> hold off


20> theta = linspace(0, 2*pi);


21> plot(cos(theta), sin(theta))


22> axis equal;


23> p = [1 -7 21 -35 35 -21 7 -1];


24> roots(p)
ans =

   1.00752 + 0.00364i
   1.00752 - 0.00364i
   1.00181 + 0.00812i
   1.00181 - 0.00812i
   0.99481 + 0.00646i
   0.99481 - 0.00646i
   0.99173 + 0.00000i



25> quit