第3章矩阵、数组和符号运算 b符号积分 符号合计函数 int(s) 不定积分 Symsum(s) int(sv Symsum(s,v int(s, a, b) 定积分 Symsum(S, a, b) int(s, v, a, b > syms k n; > syms x xl alpha ut lify (k) >>A=[cos(x t), sin(x*) -sin(x*t), cos(x t)] ans A 1/2*k^2-1/2*k cos(x*t), sin(x*t) > simplify(symsum(k 2, 0, n)) [-sin(x* t), cos(x*t) > int(A, t) 1/3*n^3+1/2*n^2+1/6*n > simplify(symsum(k,0, 10)) [1/x*sin(x*t),-cos(x*t/X ans cos(x*t)x, 1/x*sin(x*t)] 385 >>int(x1*log(1+x1)0,1) ans 1/4b.符号积分 int(S) 不定积分 int(S,v) int(S,a,b) 定积分 int(S,v,a,b) >> syms x x1 alpha u t; >> A=[cos(x*t),sin(x*t);-sin(x*t),cos(x*t)] A = [ cos(x*t), sin(x*t)] [ -sin(x*t), cos(x*t)] >> int(A,t) ans = [ 1/x*sin(x*t), -cos(x*t)/x] [ cos(x*t)/x, 1/x*sin(x*t)] >> int(x1*log(1+x1),0,1) ans = 1/4 第3章 矩阵、数组和符号运算 符号合计函数 Symsum(S) Symsum(S,v) Symsum(S,a,b) >> syms k n; >> simplify(symsum(k)) ans = 1/2*k^2-1/2*k >> simplify(symsum(k^2,0,n)) ans = 1/3*n^3+1/2*n^2+1/6*n >> simplify(symsum(k^2,0,10)) ans = 385