数值微分是一种近似法,当取较小的h值时有时后会因为电脑运算的 四舍五入 ( Round off )而导致误差,而使数值微分处于不稳定,换言之,选择适当大小的h值是一件值得重视的事.
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round-off error [数] 舍入误差 ; 舍去误差 ; [分化] 修约误差 ; 化整误差
round-off work 扫尾工作 ; 扫尾任务 ; 收尾工作 ; 开头工作
round-off [数] 舍入 ; 踺子 ; 修整
round off error 舍入规则 ; 凑整误差 ; 舍入误差
depth round-off 深度化整
round off number 修整数 ; 取整数
V to bring to a satisfactory conclusion; complete, esp agreeably (尤指圆满地)结束
we rounded off the evening with a brandy
You can round off the corners with sandpaper.
你可以用砂纸把棱角打磨光滑。
Now we will round off the corners of the images, so they look a little less pointy.
现在，我们要圆滑图像中的转角，因为它们看起来有些尖锐。
Then set the layer to Overlay blending mode and use a mask to round off the corners.
然后将这个图层的混合模式设置为叠加，并用蒙版圆滑转角。
Every time a woman lost a round of the fighting, she had to take a piece of clothing off.
VOA: special.2009.08.05
Ghana earned a berth in this year's Under-20 World Cup final by seeing off Hungary in the semi-final round Tuesday.
VOA: standard.2009.10.15
EU Finance Commissioner Olli Rehn made the call after a first round of talks with Greek officials amid growing market expectations of a trade-off between new deficit cutting steps and practical EU support for Greek borrowing.
VOA: standard.2010.03.01
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