Typing polynomial with multiple constants

Question

endah 2012-9-18

Dear Matlab user,

I am a beginner in Matlab. I am trying to make a loop to build polynomials with different constant which each equation has solution.

x1^2-3x1+1=0 x2^2+5x2+2=0 . . xn^2-6xn+n=0

would you help me about the code ? Thanks

Answer 1

Javier 2012-9-18

编辑：Javier 2012-9-18

Hello Endah

Procedure 1 (no poly function)

To write polynomial function and evaluate in some interval of X1

X=feval(@(x1)(x1.^2-3*x1+1),[0:1:10])

Procedure 2 (poly function)

root=[2 3 4]; %This is the polynomial equation 2X1^2 + 3X1 +4

%evaluate in number between 0 and 10 increments of 1

XX=polyval(root,[0:1:10]);

If need more help please let us know

Best regards and welcome to Matlab world

Javier

endah 2012-9-18

thanks Javier