syms Gr Ra Ri A B Gr1 Gr2 c d
Gr = 2*c*(Ra^2 - Ri^2) - d*(Ra^4 - Ri^4)/2;
Gr1 = subs(Gr, [c*(Ra^2 - Ri^2), -d*(Ra^4 - Ri^4)/2], [A, B])
Gr2 = subs(Gr, [c*(Ra^2 - Ri^2), d*(Ra^4 - Ri^4)/2], [A, B])
回报
Gr1 =
2*A + B
Gr2 =
2*A - (d*(Ra^4 - Ri^4))/2
有没有办法说服MATLAB Gr2 = 2*A - B在没有解决方法的情况下返回第二种情况？我有一个更复杂的表达式来替换,但我不能使用这个subs() - 行为.谢谢.