第3章矩阵、数组和符号运算 b P>a=sym([1/x,1(x+1),1(x+2),1/(x+3))ans 6*x-2*x^3-7*x^2,3/2*x^2+x+1/2*x^3 [1/x,1/(x+1) 6+2*x^3+10*x2+14*x,-1/2*x3-2*x2-3/2*x] [1/(x+2),1/(x+3) a. b →>b=sym([x,1,x+2,0J]) ans b x^2.x+1 [(x+2 x+2,O] >>a^2 a ans - ans 1/x^2+1/(x+1)/(x+2),1/x(x+1)+1/(x+1)(x+3) x-1/x,1-1/(x+1) 1/(x+2)x+1/(x+3)(x+2),1/(x+1)/(x+2)+1/(x+3)^2 [x+2-1/(x+2),-1/(x+3) p(b) ans exp(x), exp(1)] [exp(x+2),1第3章 矩阵、数组和符号运算 >> a=sym('[1/x, 1/(x+1); 1/(x+2), 1/(x+3)]') a = [ 1/x, 1/(x+1)] [ 1/(x+2), 1/(x+3)] >> b=sym('[x, 1; x+2, 0]') b = [ x, 1] [ x+2, 0] >> b-a ans = [ x-1/x, 1-1/(x+1)] [ x+2-1/(x+2), -1/(x+3)] >> a\b ans = [ -6*x-2*x^3-7*x^2, 3/2*x^2+x+1/2*x^3] [ 6+2*x^3+10*x^2+14*x, -1/2*x^3-2*x^2-3/2*x] >> a.\b ans = [ x^2, x+1] [ (x+2)^2, 0] >> a^2 ans = [ 1/x^2+1/(x+1)/(x+2), 1/x/(x+1)+1/(x+1)/(x+3)] [ 1/(x+2)/x+1/(x+3)/(x+2), 1/(x+1)/(x+2)+1/(x+3)^2] >> exp(b) ans = [ exp(x), exp(1)] [ exp(x+2), 1]