matlab求偏导答:diff(A,n,i)%对矩阵A在第i维方向求n阶差分,默认i和n均为1 A=[2 3 5;4 5 2;3 4 5]diff(A)%等价于diff(A,1,1)即对A在行方向求一阶差分 diff(A,2)%等价于diff(A,2,1)即对A在行方向求二阶差分 diff(A,[],2)%等价于diff(A,1,2)即对A在列方向求一阶差分 diff(A,2,2...
matlab中,一个函数有多个自变量,怎么分别求导并代入具体数值,举个例子...答:syms x1 x2 x3 f = x1^2+x2^2+x3^2;fx1 = diff(f,x1);fx2 = diff(f,x2);fx3 = diff(f,x3);x11 = input('请输入整数x1:');x22 = input('请输入整数x2:');x33 = input('请输入整数x3:');subs(fx1,x1,x11)subs(fx2,x2,x22)subs(fx3,x3,x33)输出的subs就是赋值...