matlab 解符号方程组S1 = 'x^2 + a*x + b*x + 1';S2 = 'x^2 + 3*b*x + 2*a*x';S11 = diff(S1,'x',1);S21 = diff(S2,'x',1);S22 = 'x-c';[x,a,b] = solve(S22,S21,S11)我希望得到的结果是x = c ; a = -4c ; b = 2c 但是结果却是x =-a/2a =-a/4b =-a
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![matlab 解符号方程组S1 = 'x^2 + a*x + b*x + 1';S2 = 'x^2 + 3*b*x + 2*a*x';S11 = diff(S1,'x',1);S21 = diff(S2,'x',1);S22 = 'x-c';[x,a,b] = solve(S22,S21,S11)我希望得到的结果是x = c ; a = -4c ; b = 2c 但是结果却是x =-a/2a =-a/4b =-a](/uploads/image/z/3685775-23-5.jpg?t=matlab+%E8%A7%A3%E7%AC%A6%E5%8F%B7%E6%96%B9%E7%A8%8B%E7%BB%84S1+%3D+%27x%5E2+%2B+a%2Ax+%2B+b%2Ax+%2B+1%27%3BS2+%3D+%27x%5E2+%2B+3%2Ab%2Ax+%2B+2%2Aa%2Ax%27%3BS11+%3D+diff%28S1%2C%27x%27%2C1%29%3BS21+%3D+diff%28S2%2C%27x%27%2C1%29%3BS22+%3D+%27x-c%27%3B%5Bx%2Ca%2Cb%5D+%3D+solve%28S22%2CS21%2CS11%29%E6%88%91%E5%B8%8C%E6%9C%9B%E5%BE%97%E5%88%B0%E7%9A%84%E7%BB%93%E6%9E%9C%E6%98%AFx+%3D+c+%3B+a+%3D+-4c+%3B+b+%3D+2c+%E4%BD%86%E6%98%AF%E7%BB%93%E6%9E%9C%E5%8D%B4%E6%98%AFx+%3D-a%2F2a+%3D-a%2F4b+%3D-a)
matlab 解符号方程组S1 = 'x^2 + a*x + b*x + 1';S2 = 'x^2 + 3*b*x + 2*a*x';S11 = diff(S1,'x',1);S21 = diff(S2,'x',1);S22 = 'x-c';[x,a,b] = solve(S22,S21,S11)我希望得到的结果是x = c ; a = -4c ; b = 2c 但是结果却是x =-a/2a =-a/4b =-a
matlab 解符号方程组
S1 = 'x^2 + a*x + b*x + 1';
S2 = 'x^2 + 3*b*x + 2*a*x';
S11 = diff(S1,'x',1);
S21 = diff(S2,'x',1);
S22 = 'x-c';
[x,a,b] = solve(S22,S21,S11)
我希望得到的结果是x = c ; a = -4c ; b = 2c
但是结果却是
x =-a/2
a =-a/4
b =-a/4
这事为啥?
matlab 解符号方程组S1 = 'x^2 + a*x + b*x + 1';S2 = 'x^2 + 3*b*x + 2*a*x';S11 = diff(S1,'x',1);S21 = diff(S2,'x',1);S22 = 'x-c';[x,a,b] = solve(S22,S21,S11)我希望得到的结果是x = c ; a = -4c ; b = 2c 但是结果却是x =-a/2a =-a/4b =-a
你只要把这句
[x,a,b] = solve(S22,S21,S11)
改为
[x,a,b] = solve(S22,S21,S11,'x,a,b')
就可以了,加的东西就是说明,x,a,b是未知数,剩下的c就是当已知数了.
[x,a,b] = solve(S22,S21,S11,'x,a,b')
x =
-4*c
a =
2*c
b =
c