dy dx=-(-1/x-y/x2*exp(-y/x))x/exp(-y/x) 例3.14.设,求 输入命令: a=jacobian (sin(x*y)+cos(y*)+tan(z*x),x, y, z) 可得矩阵 [cos(x*y)*y+(1+tan(z*x)2)*z, cos(x*y)*x-sin(y*z)*z sin(y*z)y+(1+tan(z*x)2)x 输入命令 dz dx-a(1)a(3) (-cos(x*y)*y-(1+an(2*x)2)*2)(-sin(y*2)y+(1+an(2*x)2)*x) 输入命令 dz_dy=-a(2)a(3) (-cos(x*y)*x+sin(y*2)*2)(-sn(y*2)*y+(1+tan(z*x)2)*x) 实验7矩阵与线性方程组 实验目的: 1.掌握 matlab求矩阵的秩命令.dy_dx=-(-1/x-y/x^2*exp(-y/x))*x/exp(-y/x). 例 3.14.设 ，求 解: 输入命令: a=jacobian(sin(x*y)+cos(y*z)+tan(z*x)，[x，y，z]) 可得矩阵 a= [cos(x*y)*y+(1+tan(z*x)^2)*z，cos(x*y)*x-sin(y*z)*z， -sin(y*z)*y+(1+tan(z*x)^2)*x]. 输入命令: dz_dx=-a(1)/a(3) 得: dz_dx= (-cos(x*y)*y-(1+tan(z*x)^2)*z)/(-sin(y*z)*y+(1+tan(z*x)^2)*x) 输入命令: dz_dy=-a(2)/a(3) 得: dz_dy= (-cos(x*y)*x+sin(y*z)*z)/(-sin(y*z)*y+(1+tan(z*x)^2)*x) 实验 7 矩阵与线性方程组 实验目的： １．掌握 matlab 求矩阵的秩命令．