第3章矩阵、数组和符号运算 矩阵运算 egl ans 1/conj (x), 1/(2+conj (x))] 1/2*x+1/2*(x^2+4*x+8)^(1/2 [1/(1+conj(x)), 1/(3+conj(x))] [1/2*x-1/2*(x^2+4*x+8)(12) > inv(a) triu(a) ans ans 1/2*x*(x+1)*(X+2),-12*x*(x+3)*(x+2) 1/x,1/(x+1) -1/2*x*(x+3)*(x+1),1/2*(x+3)*(x+1)*(x+2) 0,1/(x+3) > det(a) diala) ans - 2/x/(x+3)(x+1)(x+2) > rank(a) X >tril(a) ans 1/(x+2),1(x+3)第3章 矩阵、数组和符号运算 矩阵运算 >> a' ans = [ 1/conj(x), 1/(2+conj(x))] [ 1/(1+conj(x)), 1/(3+conj(x))] >> inv(a) ans = [ 1/2*x*(x+1)*(x+2), -1/2*x*(x+3)*(x+2)] [ -1/2*x*(x+3)*(x+1), 1/2*(x+3)*(x+1)*(x+2)] >> det(a) ans = 2/x/(x+3)/(x+1)/(x+2) >> rank(a) ans = 2 >> eig(b) ans = [ 1/2*x+1/2*(x^2+4*x+8)^(1/2)] [ 1/2*x-1/2*(x^2+4*x+8)^(1/2)] >> triu(a) ans = [ 1/x, 1/(x+1)] [ 0, 1/(x+3)] >> diag(a) ans = [ 1/x] [ 1/(x+3)] >> tril(a) ans = [ 1/x, 0] [ 1/(x+2), 1/(x+3)]