| 单词 | difference equation |
| 释义 | difference equation An equation involving the values of a variable at different times, assuming a discrete measure of time. Such an equation can be written in terms of the current value of the variable and its differences. For example, xt + axt-1 = b can be written as (1 + a)xt - a(xt - xt-1)=(1 + a)xt - aΔxt = b. The same principle applies to equations in any N successive periods; they can be written in terms of xt and its N - 1 differences. |
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