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TTT_IOU · 2009-06-02, 07:59

syms a t x x1 x2
f=[a,t^3;t*cos(x),log(x)];
fx12=[x1*exp(x2);x2;cos(x1)*sin(x2)];
dfx=diff(f,x);
dft2=diff(f,t,2);
dftx=diff(dfx,t);
jx12=jacobian(fx12,[x1,x2]);
fx=sin(abs(x));
fx_x=diff(fx);
望有帮助！！！

2009-06-02, 07:59	#2
TTT_IOU 普通会员注册日期: 2009-02-22 帖子: 91 声望力: 18	回复: 初学者求教！！！ syms a t x x1 x2 f=[a,t^3;tcos(x),log(x)]; fx12=[x1exp(x2);x2;cos(x1)*sin(x2)]; dfx=diff(f,x); dft2=diff(f,t,2); dftx=diff(dfx,t); jx12=jacobian(fx12,[x1,x2]); fx=sin(abs(x)); fx_x=diff(fx); 望有帮助！！！