TAILIEUCHUNG - Two Point Boundary Value Problems part 2

In this section we discuss “pure” shooting, where the integration proceeds from x1 to x2 , and we try to match boundary conditions at the end of the integration. In the next section, we describe shooting to an intermediate fitting point | The Shooting Method 757 The Shooting Method In this section we discuss pure shooting where the integration proceeds from x1 to x2 and we try to match boundary conditions at the end of the integration. In the next section we describe shooting to an intermediate fitting point where the solution to the equations and boundary conditions is found by launching shots from both sides of the interval and trying to match continuity conditions at some intermediate point. Our implementation of the shooting method exactly implements multidimensional globally convergent Newton-Raphson . It seeks to zero n2 functions of n2 variables. The functions are obtained by integrating N differential equations from x1 to x2. Let us see how this works At the starting point x1 there are N starting values yj. to be specified but subject to n1 conditions. Therefore there are n2 N n1 freely specifiable starting values. Let us imagine that these freely specifiable values are the components of a vector V that lives in a vector space of dimension n2. Then you the user knowing the functional form of the boundary conditions can write a function that generates a complete set of N starting values y satisfying the boundary conditions at x i from an arbitrary vector value of V in which there are no restrictions on the n2 component values. In other words converts to a prescription yj xi yi xi Vi . Vn2 i 1 . N Below the function that implements will be called load. Notice that the components of V might be exactly the values of certain free components of y with the other components of y determined by the boundary conditions. Alternatively the components of V might parametrize the solutions that satisfy the starting boundary conditions in some other convenient way. Boundary conditions often impose algebraic relations among the yj rather than specific values for each of them. Using some auxiliary set of parameters often makes it easier to solve the boundary relations

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