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Local truncation error : ウィキペディア英語版
Truncation error (numerical integration)
Truncation errors in numerical integration are of two kinds:
* ''local truncation errors'' – the error caused by one iteration, and
* ''global truncation errors'' – the cumulative error caused by many iterations.
== Definitions ==
Suppose we have a continuous differential equation
: y' = f(t,y), \qquad y(t_0) = y_0, \qquad t \geq t_0
and we wish to compute an approximation y_n of the true solution y(t_n) at discrete time steps t_1,t_2,\ldots,t_N . For simplicity, assume the time steps are equally spaced:
: h = t_n - t_, \qquad n=1,2,\ldots,N.
Suppose we compute the sequence y_n with a one-step method of the form
: y_n = y_ + h A(t_, y_, h, f).
The function A is called the ''increment function'', and can be interpreted as an estimate of the slope of y_n .

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