problem with an integral
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A system obey an equation of motion y''=f(y'(t),y(t),t) but f(y'(t),y(t),t) change as a function of y(t).
For example if y>=0 then y''=g(y'(t),y(t),t) and if y<0 then y''=h(y'(t),y(t),t).
Is it possible to write a script with a solver that can integrate "the right function at the right moment"? Anyone could help me? Thanks a lot!
回答（1 个）
Walter Roberson
2015-5-30
0 个投票
y'' = Heaviside(y) * g(y'(t),y(t),t) + Heaviside(-y) * h(y'(t),y(t),t)
Provided, that is, that Heaviside(x) is defined as 0 when x is 0.
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2015-5-29
2015-5-30
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