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【求助】maple计算过程的问题
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> eq1 := diff(u(x, t), `$`(t, 2))-(diff(u(x, t), `$`(x, 2)))+alpha*u(x, y)-beta*u(x, y)^3 = 0; print(`output redirected...`); # input placeholder / d / d \\ / d / d \\ 3 |--- |--- u(x, t)|| - |--- |--- u(x, t)|| + alpha u(x, y) - beta u(x, y) = 0 \ dt \ dt // \ dx \ dx // > eq2 := algsubs(u(x, t) = phi(xi)*exp(i*(k2*x+`ϖ2`*t)), eq1); print(`output redirected...`); # input placeholder 2 2 phi(xi) i ϖ2 exp(i (k2 x + ϖ2 t)) 2 2 3 - phi(xi) i k2 exp(i (k2 x + ϖ2 t)) + alpha u(x, y) - beta u(x, y) = 0 > eq3 := algsubs(xi = k1*x+omega1*t, eq2); print(`output redirected...`); # input placeholder eq2 > collect(eq3, [diff(phi(xi), `$`(xi, 2)), diff(phi(xi), xi), phi(xi), phi(xi)^3], eq3); print(`output redirected...`); # input placeholder eq2(eq2) > 本应做两次变换,u(x, t) = phi(xi)*exp(i*(k2*x+`ϖ2`*t)),xi = k1*x+omega1*t,怎样化简eq1呢?多谢1 |
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