matlab u=- 25:01: 3.25,v=polyinterp(x,y, u) plot(, y,o', u,v,-) 0.5
-0.5 0 0.5 1 1.5 2 2.5 3 3.5 -10 -5 0 5 10 15 20 25 u = -.25:.01:3.25; v = polyinterp(x,y,u); plot(x,y,’o’,u,v,’-’)
Polyinterp(符号运算) MATLAB smx =sym(X) P= polyinterp(x, y, symx) pretty(P) P= simplify(p) X^3-2*x-5
Polyinterp(符号运算) symx =sym(‘x’) P = polyinterp(x,y,symx) pretty(P) P = simplify(P) P = x^3-2*x-5